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#2601 |
Master Poster
Join Date: Apr 2017
Location: Houston, Texas
Posts: 2,691
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How can the radar both confirm and deny any ascent? Which radar are you describing and which radar do your fellow CTs describe in relation to this determination?
How many seconds after the explosion elapsed before the nose section hit the water? Additionally, how many seconds elapsed before the fuselage hit the water? Your ace radar expert Stalcup should have listed the information in his presentation. |
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#2602 |
Penultimate Amazing
Join Date: Sep 2011
Location: The great American West
Posts: 22,561
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I should take this opportunity to point out that in your mad rush to "expose" me, you have repeatedly conflated the nose landing gear, the nose landing gear doors, and the nose landing gear door hinges. Maintaining the distinction among these is important, because you have misapplied your rebuttals to my arguments regarding one component to another component. For example, I argue that terminal velocity is irrelevant to the damage observed on the nose landing gear doors, but not irrelevant to the damage observed to the nose landing gear. I was clear; you were careless.
I brought this to your attention when you first raised this by way of the ARAP report, but you haven't seen fit to correct your presentation. In fact, you also misrepresent the ARAP report in these same distinctions. For example, the "inward" deformation was not to the nose landing gear, or the nost landing gear doors, but to the nose landing gear door hinges. The ARAP report got it right, but you misrepresented it and continue to do so. The apparent idiocy you attribute to my argument is not the fault of my argument, but of your ongoing carelessness in noting which assembly I and your sources are talking about. |
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#2603 |
Penultimate Amazing
Join Date: Oct 2012
Location: Nelson, New Zealand
Posts: 23,577
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__________________
What is Woke? It is a term that means "awakened to the needs of others". It means to be well-informed, thoughtful, compassionate, humble and kind. Woke people are keen to make the world a better, fairer place for everyone, But, unfortunately, it has also become a pejorative used by racists, homophobes and misogynists on the political right, to describe people who possess a fully functional moral compass. |
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#2604 |
Penultimate Amazing
Join Date: Oct 2012
Location: Nelson, New Zealand
Posts: 23,577
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Yeah, but those are static, as in there is no relative motion to consider and no need to detect any proximity. You can set those things to go off a fixed timeline with no need to detect any influences in the outside world.
But to have a shaped charge go off and do the damage that mikegriffith1 is on about - specifically, a couple of holes that appear to be "sooted" and made by "jets of hot gas", the distance between that shaped charge located in the business end of a missile, and the aircraft skin has to be just a few inches, so the proximity has to be measured down to inches while the missile is still incoming at over 3,000 fps. Also, the charge has to be set off at a precise moment with enough lead time so that the "jets of hot gas" make the holes before the body of the missile impacts the aircraft. I argue, why even design such a complex system, one that requires so much precision? |
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What is Woke? It is a term that means "awakened to the needs of others". It means to be well-informed, thoughtful, compassionate, humble and kind. Woke people are keen to make the world a better, fairer place for everyone, But, unfortunately, it has also become a pejorative used by racists, homophobes and misogynists on the political right, to describe people who possess a fully functional moral compass. |
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#2605 |
Muse
Join Date: Jul 2018
Posts: 592
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#2606 |
Penultimate Amazing
Join Date: Sep 2011
Location: The great American West
Posts: 22,561
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#2607 |
Master Poster
Join Date: Apr 2017
Location: Houston, Texas
Posts: 2,691
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#2608 |
Penultimate Amazing
Join Date: Sep 2011
Location: The great American West
Posts: 22,561
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#2609 |
Safely Ignored
Join Date: Oct 2009
Posts: 14,690
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#2610 |
Master Poster
Join Date: Apr 2017
Location: Houston, Texas
Posts: 2,691
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#2611 |
Illuminator
Join Date: Jul 2007
Posts: 4,066
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I’d just like to know how many missiles he thinks fuzed on the plane, and what kinds. He doesn’t really have a claim until he answers that.
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#2612 |
Muse
Join Date: Sep 2012
Posts: 547
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Where in the NTSB report do you find the claim that the doors were damaged by aerodynamic deformation? Where? Where is it? Such a claim is not made in the Structures Group Chairman’s Factual Report of Investigation (see p. 40). Nor is this claim made in the NTSB report itself. The NTSB report says the three doors may have opened early in the breakup and then could have been “torn off by exposure to the air stream,” but it says nothing about the doors being damaged by air pressure after they were allegedly torn off by the air stream (NTSB report, p. 117). The NTSB investigators who spoke with journalists about the landing gear doors suggested no such far-fetched theories. Several NTSB investigators spoke with journalists about this "baffling," "mystifying" damage. Obviously, these investigators recognized that this damage could not have been done merely by impact on water or by traveling through the air, or else they would not have been "baffled" and "mystified" by it. Let's read a CNN report on this matter, published on 9/5/1997: Federal officials investigating the crash of TWA Flight 800 are baffled by the recent discovery of impact damage on the doors that close over the front landing gear. According to several people involved in the investigation, for the last two weeks National Transportation Safety Board investigators have been trying to figure out what could have caused the nose gear doors to blow inward -- and whether whatever caused that damage happened before the plane's center fuel tank exploded. The Boeing 747 crashed into the Atlantic shortly after takeoff from New York's Kennedy Airport en route to Paris, July 17, 1996, killing all 230 people aboard. Examiners who have been looking at crash wreckage for the past 13 months are now said to be mystified about the significance of the damage on the doors, which are located below the flight deck and well forward of the plane's center fuel tank. ("Nose Gear Doors Baffle TWA Crash Investigators," 9/5/1997, http://www.cnn.com/US/9709/05/briefs...ors/index.html)
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Also, obviously, the circumstances in the case of the Vincennes incident were very different from those of TWA 800, starting with the geographic location and the presence of foreign entities.
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When patriots discuss the rare occurrences of misconduct in the military, such as the attempt to cover up the facts about the Vincennes incident, they do so to be constructive and in the hope of discouraging such actions in the future. Only a disreputable demagogue would call this “trashing” the military. You liberals are the ones who are usually trashing the military, trying to gut the defense budget, accusing our soldiers of committing war crimes, and imposing ridiculous rules of engagement on our forces in combat.
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By the way, speaking of the Vincennes incident, how many sailors from that ship have come forward to admit that Captain Rogers plainly and clearly entered Iranian territorial waters without legal or operational justification? Hey? How many of Vincennes’ senior officers have done so? How many of them have come forward to admit that Admiral Crowe misled Congress when he claimed that Rogers was acting under the right of innocent passage? Gee, I guess none of these things happened, since “surely some sailors would have come forward by now about this!” Right? Sound familiar? Here's an instructive article on the Vincennes cover-up by Lt. Col. David Evans, U.S. Marine Corps (Ret.), published in the U.S. Naval Institute’s U.S. Naval Proceedings Magazine: https://www.usni.org/magazines/proce...nes-case-study You're not going to accuse the U.S. Naval Institute of being a bunch of "conspiracy theorists," are you? |
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#2613 |
Penultimate Amazing
Join Date: Oct 2012
Location: Nelson, New Zealand
Posts: 23,577
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Another wall of fail! (And no, I have not read any of it, because nothing you have said in the last few pages is any different from the rest of the regurgitated lies, spurious half-truths, intentionally misrepresented and misunderstood facts, wilful ignorance, poorly sourced conspiracy-theorist claptrap and complete bull-**** you have been spouting all along.) As for your constant attacks on Jay, you should know they are summarily dismissed by the considerable number of people here, including me, who know Jay outside of this forum, and who know that he is a qualified Aerospace Engineer with extensive experience who knows exactly what he is talking about in regard to the topic of this thread. I am an Aeronautical Engineer (retired) and while I am not not up to Jay's level of expertise and experience, I am nonetheless sufficiently qualified and experienced to recognize bull-**** when I read it, and you mikegriffith1 are full of it! |
__________________
What is Woke? It is a term that means "awakened to the needs of others". It means to be well-informed, thoughtful, compassionate, humble and kind. Woke people are keen to make the world a better, fairer place for everyone, But, unfortunately, it has also become a pejorative used by racists, homophobes and misogynists on the political right, to describe people who possess a fully functional moral compass. |
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#2614 |
Illuminator
Join Date: Jul 2007
Posts: 4,066
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Originally Posted by mikegriffith1
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#2615 |
Master Poster
Join Date: Apr 2017
Location: Houston, Texas
Posts: 2,691
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#2616 |
Philosopher
Join Date: Mar 2012
Location: Central California Coast
Posts: 6,591
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First off, there is not a body of historical engineering data to say what is and isn't unusual in the crash of TWA-800. The 747 proved to be a safe airframe, so there aren't a lot of crashes to compare this event to, and only KAL-007 remains the other 747 shot down in any way. The Soviets/Russians control access to the wreckage, and thus no investigation. Sure, investigators would be baffled, but in almost every plane crash you will find the NTSB's crew arguing and or mystified over some element of the crash evidence. If you're implying that the missile detonated under the nose you have a big problem: the wreckage shows no such thing.
The missile would have to detonate within a few feet of the fuselage, and that would leave scorching, pitting, and shredding. There was nothing like that. This was a one-time event as far as scope of aircraft size and death. There were a lot of things which investigators had to figure out. And they looked for a bomb, they looked for missile damage. The found neither.
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And your statement is historically and factually incorrect (and a big fat lie). SecDef Cheney, under Bush, oversaw the largest defense cuts since WWII. And he cut too deep. In 2013, the GOP forced the government into budget sequestration because a black guy was in the White House, and this resulted in all kinds of DoD juggling to keep operations going. This also meant the military could not make long term plans as far as resupply, and new weapons/equipment. And Diaper Donny took/stole money from the defense budget to pay for his stupid border wall. The Bush NSC set the rules of engagement in OIF and OEF. They also embraced COIN. Nothing changed under Obama or Trump. The ROEs are still the same under Biden. I voted for both Bush(es). I did not vote for Bill Clinton or Obama either time. I voted for Hillary and Biden because it was literally a binary choice. But hey, thanks to revealing yourself as a partisan hack, it explains the root of your flaws.
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Then, it was Admiral Crowe who admitted the ship was in Iranian waters at the time of the shooting, and that was three years later. But the ICAO had reported that fact in December, 1988. What we did know on July 4, 1988, is that a US Navy destroyer had shot down an Iranian jetliner. Hell, we even had bridge video of the incident within a few days: https://www.youtube.com/watch?v=u4XfdJfynrQ The video was released by *checks notes* the Department of Defense. So I'm not sure why sailors would be lining up to tell the press what they mostly already knew. And to put it as conservatively patriotically cold-blooded as I can - It was an Iranian jetliner. In 1988 most Americans could care less.
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Disingenuous Piranha |
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#2617 |
Penultimate Amazing
Join Date: Oct 2012
Location: Nelson, New Zealand
Posts: 23,577
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__________________
What is Woke? It is a term that means "awakened to the needs of others". It means to be well-informed, thoughtful, compassionate, humble and kind. Woke people are keen to make the world a better, fairer place for everyone, But, unfortunately, it has also become a pejorative used by racists, homophobes and misogynists on the political right, to describe people who possess a fully functional moral compass. |
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#2618 |
No longer the 1
Join Date: Apr 2007
Posts: 28,570
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__________________
As human right is always something given, it always in reality reduces to the right which men give, "concede," to each other. If the right to existence is conceded to new-born children, then they have the right; if it is not conceded to them, as was the case among the Spartans and ancient Romans, then they do not have it. For only society can give or concede it to them; they themselves cannot take it, or give it to themselves. |
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#2619 |
Penultimate Amazing
Join Date: Sep 2011
Location: The great American West
Posts: 22,561
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Yes, this straw man you keep trying to pin on me is indeed simplistic and implausible.
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Their initial hypothesis was that the doors were forced inward. But their ultimate conclusion, based on a more careful and holistic study, was that there was no significant inward travel and that the observed hinge damage could be explained in other ways. No, if the doors remained closed and attached to the airframe, it is unlikely that aerodynamic pressure could have deformed them or the hinges. But if they're open, they become extremely drag sensitive and the hinges bear most of that stress. If, for example, one of the forward or aft specimens of the three hinges on the forward nose gear doors fails, and the airflow is not longitudinal, there is ample opportunity for aerodynamic deformation in the partially attached door. Terminal velocity of the doors themselves is irrelevant. Terminal velocity of the entire nose section—with the open doors still attached—is marginally relevant. The governing factor is the velocity at initial breakup; objects slow to terminal velocity from that initial powered-flight velocity. ARAP proposes to dismiss this scenario by noting that gear doors may be extended in flight without damage. I already explained why this is a straw man. In a midair breakup scenario there is no reason to assume the airflow over the nose section will stay longitudinal in the way that makes it safe to extend the gear doors. ARAP also seems to insinuate that the NTSB would need to attribute the damage in this area to the direct effects of a center wing tank deflagration, which they assert (defensibly) to be implausible. But this too is a straw man; the NTSB makes no such claim. These are some of the many reasons we cannot consider Donaldson et al.'s activity an investigation. They do not test their own hypotheses (see below). They do not accurately represent alternative hypotheses. They offer criticism that would seem plausible to a lay audience, but which an expert can easily see are dishonest. It's clearly an exercise designed to erode public faith in an unfavored conclusion by any means.
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Despite your suggestion that we're just dumbly defending the NTSB, some of us actually know how to reason through these problems on our own and don't need to be spoon-fed our beliefs from either side, or by sensationalist media reports from early in the investigation. I'm actually interested in what may have happened to TWA 800. You seem to view this exercise as categorically trashing selected people and organizations. Where are the engineering details and computations supporting the hypothesis that the door hinges were blown inward, and the gear strut assembly itself damaged, by an air-intercept missile detonation? That's clearly the conclusion that your conspiracy theorists expect the reader to draw, but there's no computation or empirical test to demonstrate this. Your authors correctly note that landing gear struts are some of the more robust structures in an airframe. But then they hand-wavingly insinuate that an air-intercept bursting charge can severely damage them. Not even a back-of-envelope computation for how close the detonation would have to be in order to inflict that exact kind of damage? It's not an investigation if your own conclusion is held only implicitly. Further, you can either have "jets of hot gas" that cut metal skin and structure, or a wavefront that bends and deforms them, but not both. Since you can't seem to understand from the sources you cited how explosions work, I'm not sure you grasp how your conspiracy theorists must rely on contradictory theories to explain different bits of evidence. I think the reason you and your authors can't settle on what actual weapon must have been used is that for it to explain all the damage you speculatively attribute to it, it would have to be a magic warhead.
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Regarding the U.S. Navy, I spent a rewarding portion of my early career contracting for the U.S. Navy, including duty at sea. Two members of my family are Navy officers—one is a lieutenant commander. Right now both are at sea on active duty in a hazardous area. In contrast, you and the authors you mention accuse the Navy of manslaughter and coverup with the flimsiest of evidence. I don't feel like being lectured by you right now about disrespect for the Navy.
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I don't have the time or the inclination today to explain everything you're getting wrong about the Vincennes incident. |
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#2620 |
Muse
Join Date: Sep 2012
Posts: 547
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When Air France 447, an Airbus A330, stalled and dropped from 37,000 feet, not only did the airplane not break up on the way down, but the oxygen masks did not even deploy because the passenger cabin maintained air pressure until the plane hit the water (Bureau of Enquiry and Analysis for Civil Aviation Safety (BEA), Final Report: Air France Flight 447, July 2012, p. 70, https://bea.aero/docspa/2009/f-cp090...p090601.en.pdf) “Terminal velocity is irrelevant”??!!! You bet! And high-order explosions don’t produce jets of hot gas, right? And ARAP’s theory is that that Stinger missiles were involved, right? And Commander Donaldson was the only author of the ARAP report, right? Etc., etc., etc. Terminal velocity most certainly is relevant because it proves that the nose landing gear would not have hit the water hard enough to cause severe structural damage. The NTSB Structures Group report says nothing about your absurd aerodynamic deformation theory—it advances only one explanation for the damage done to the nose landing gear: impact damage, i.e., impact on water (Structures Group Chairman's Factual Report of Investigation, NTSB Exhibit 7a, 2/20/1997, p. 38). When Birky floated the impact-damage theory to explain the damage that he and James Speer both saw on a wing leading edge rib, Speer correctly pointed out that the phenomenon of terminal velocity would have prevented the edge rib from hitting the water hard enough to cause such damage. The case of Air France 447 is a good example of this fact. When the plane had descended to 35,000 feet, it was falling at a speed of about 10,000 feet per minute, or 113 mph (BEA, Final Report: Air France Flight 447, p. 23). When the plane hit the water 2 minutes and 46 seconds later, it was descending at a speed of 10,912 feet per minute, or 124 mph (BEA, Final Report: Air France Flight 447, p. 24).
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You are misrepresenting Commander Donaldson’s analysis of the debris fields and of where the items fell in them, or else you do not understand what he’s saying. Donaldson was using standard principles of debris field analysis. Everything he said is valid. Anyone who has any background in aircraft crash investigation knows that the main value and function of debris field analysis is (1) that it helps investigators determine which parts of the aircraft failed first, and (2) that it may enable investigators to determine the cause of the crash.
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Moreover, Donaldson’s point about 3,000 PSI was a general reference to the documented ability of hydraulic cylinders in landing gear to handle 3,000 PSI of hydraulic fluid (see, for example, https://blog.brennaninc.com/hydrauli...t-of-our-lives). He addressed the issue of yield strength two paragraphs later when he noted that the nose landing gear can be extended even when the plane is flying at a speed of 320 knots, or 368 mph: The landing gear on a B747 are extremely tough. They can be extended at speeds up to 320 knots Indicated Air Speed (IAS), or .82 mach, and can be raised at speeds up to 270 knots IAS, or .82 mach. Flight 800’s airspeed was 298 IAS and .6 mach! This means that even if the Captain had intentionally lowered the landing gear in flight at 13,800 feet, nothing in the landing gear or gear door assemblies would have failed. (ARAP report, p. 18) The validity of this point is self-evident. If the nose landing gear can withstand being opened at speeds up to 368 mph (320 knots), it surely would not have suffered severe structural damage merely from impact on water or from descending through the air, no matter how many “abnormal angles” it assumed during its descent. I truly cannot believe that you are peddling this hilarious theory in a public forum while pretending to be any kind of an expert in engineering and crash investigation. The nose landing gear was about 12 feet tall and weighed about 3,000 pounds. It was made of tough steel and titanium. Second only to certain parts of the engines, it was the toughest, strongest part of the plane. Yet, this gear was severely disfigured, and several investigators reported this to journalists. One investigator described the damage to the nose landing gear as follows: “This was a huge piece of thick steel, and it had been blasted, is the only way to describe it." ("Landing Gear Damage Points to Bomb on TWA Flight: Retracted Nose Wheel Took Strong Blast, Probers Say," Baltimore Sun, 7/31/1996, https://www.baltimoresun.com/news/bs...067-story.html) Another investigator said the landing gear suffered "serious concussive damage" and that it had been “smashed” (Ibid.). The photo of the nose landing gear proves these descriptions were entirely justified. Now, if you want to tell yourself that these investigators were legally blind, that they were just seeing things, that they were "mistaken" about the severity of the damage to the nose landing gear, no one can stop you. But the photo of the nose landing gear shows just how severely it was damaged, and the only two theories your side can offer for that damage are ludicrous on their face and physically impossible. |
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#2621 |
Penultimate Amazing
Join Date: Sep 2011
Location: The great American West
Posts: 22,561
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[deleted, accidental submission]
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#2622 |
Illuminator
Join Date: Jul 2007
Posts: 4,066
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Originally Posted by mikegriffith1
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#2623 |
Penultimate Amazing
Join Date: Sep 2011
Location: The great American West
Posts: 22,561
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Wow, this is an intensely personal deal for you, isn't it? You don't care about the details of the missile theory, but you're doggedly obsessed with whether I'm an imposter. Are you well?
Because we have wildly whiplashed among discussions of the landing gear, the landing gear doors, and the landing gear door hinges, I clarified a few posts above exactly which structures I argue need to include terminal velocity in their analysis. You seem to have missed it, so I'll repeat it. No, terminal velocity is not relevant to the analysis of the landing gear doors, but it is relevant to the analysis of the landing gear itself. I apologize for my part of that confusion.
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For a contravening example, consider AA Flight 587 in 2001. In that accident, the vertical stabilizer detached from the airframe due merely to overly aggressive control inputs from the pilot.
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Further, the nose gear assembly is actually made up of several struts. The central strut is the strongest of this assembly, of course. But the upper portion of that telescoping assembly is merely a hollow tube filled with oil acting as a shock absorber. All the components of the nose gear assembly are mean to be loaded axially, in which mode even relatively gracile structural members can bear a tremendous load. How surprised would you be to learn that some of the secondary struts are actually hollow tubes?
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I'm a licensed engineer. He was not. I have large-airframe experience. He did not. He was funded by a media personality who had a right-wing bias. I work only for myself. He did not submit his findings for any kind of peer review. My work, even when done for private clients, is usually subjected to adverse review by peer engineers and occasionally also lawyers. You have no expertise that would let you judge whether Donaldson, Stalcup, or any other of your other sources have made sound engineering judgment. You simply declare them to be experts beyond all criticism. Nor are you qualified in any way to determine whether I'm professionally competent in my field.
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An aluminum beverage can has a pressure-bearing capacity of well over 50 psi. But it can be deformed according to a bending moment by only a couple of foot-pounds. Naturally hydraulic cylinders are proportionally thicker, but it demonstrates the difference between the two stress modes. Pressure bearing is tensile strength, not yield strength in the bending mode. They are not comparable forces.
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Again, your report does not test the viability of the theory that an air-intercept bursting charge could have caused the damage to the landing gear assemblies that you attribute to one. Why didn't Donaldson perform that critical test before drawing his conclusion? You note correctly that it would be absurd to argue that aerodynamic forces would damage the landing gear itself. Don't you understand that blast damage from a detonation is just a special case of aerodynamic loading? |
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#2624 |
Illuminator
Join Date: Jul 2007
Posts: 4,066
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Originally Posted by JayUtah
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#2625 |
Penultimate Amazing
Join Date: Oct 2012
Location: Nelson, New Zealand
Posts: 23,577
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This, right here tells me that you do not have the foggiest idea what you are talking about.
Let me state this right now, categorically, and for the record. High Order Explosives (for example, nitroglycerine, dynamite and C-4) do not, in or of themselves, produce jets of hot gas UNLESS a shaped charge is used. YOUR OWN SOURCE EXPLAINS THIS!!!! If Speer is claiming this THEN HE IS WRONG... PERIOD!!!! And has already been explained to you along with the reasons, by Jay and myself, anti-aircraft missiles DO NOT USE SHAPED CHARGES! |
__________________
What is Woke? It is a term that means "awakened to the needs of others". It means to be well-informed, thoughtful, compassionate, humble and kind. Woke people are keen to make the world a better, fairer place for everyone, But, unfortunately, it has also become a pejorative used by racists, homophobes and misogynists on the political right, to describe people who possess a fully functional moral compass. |
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#2626 |
Muse
Join Date: Jul 2018
Posts: 592
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This absolute fact, paired with mikegriffith1's cold-shouldered failure to acknowledge it, is fairly conclusive evidence that he is merely a troll, and not a very bright one, either. This is the childish annoyance game of merely repeating the same thing over and over, despite any and all counter-evidence, as their only way to claim victory is to hope their opponent(s) retire out of boredom, frustration, or old age.
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#2627 |
Penultimate Amazing
Join Date: Sep 2011
Location: The great American West
Posts: 22,561
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Since we've doubled down on the "explosions produce jets of gas" claim. Let's visit this past post in greater detail :—
No, Speer argues for a jet of gas. A jet operates in a single direction along a linear path, to concentrate its effect on the material in a single place. Speer is pointing to a single place on the airframe—holes he says were formed by "jets of hot gas," necessarily concentrated at that spot to produce the effect there, and not on the surrounding structure. A bursting charge operates in all directions, not as a jet but as the omnidirectional shock wave your sources discuss. It is initially at high pressure, so that it bursts the frag assembly. As the shock wave expands, the pressure drops according to the inverse square law. This is basic physics, from when you first learned the kinetic theory of gases, the ideal gas law, etc.
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Second, you give us the ellipsis, but you dishonestly try to sew together the previous quote describing the omnidirectional shock wave with the following one describing a focused effect, which you seem to want to consider a single thought.
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Interesting that you excised the paragraph that explained the exact distinction I described in the preparation of the charge to produce the very different effect of a cutting jet. Figure 12 in your source illustrates the difference between a charge that cuts and one that doesn't. One is a shaped charge; the other isn't. Was this omission an error? An oversight? I and several others drew your attention to the notion that you had possibly misread or misrepresented your source. Did you go back to see whether you had omitted something important (which, in fact, you did)? No. Instead you doubled down no fewer than three times in a subsequent post to propound a lie. Your source does not establish that a charge meant to throw frags in all directions will also be able to create a cutting jet. In fact it belabors the distinction for a full page of discussion that includes two illustrations. Once might be a mistake. Three times is a deliberate lie. In contrast, when I tried to follow you on your merry jaunt through the Boeing 747's undercarriage, I belatedly noticed you had switched from talking about the doors and hinges to the gear structure itself. I therefore took the initiative to start over at a certain point to clarify what I believed to be the aerodynamic and structural effects in each case. This is because it's important to me to get the science right, even if it means having to retrace my steps. But to you it seems more important to merely appear right at all costs, regardless of facts. Now your other sources.
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Did you read the entire source? Did you think it might have been important to note that this source entirely confirms the distinctions I previously drew between shaped-charge warheads and fragmentation warheads?
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You're simply lying. There's really no more apt explanation. You've deliberately cherry-picked from these sources—in one case egregiously. You claim to be an expert here, but you seem to lack basic understanding of elementary physical principles such as the inverse square law. This principle is typically introduced in high school physics. It's the law that governs shock waves, and everyone here except for you seems to have remembered this, regardless of their nominal occupation and experience. Up until now I have given you the benefit of the doubt, granting you that despite all the counterarguments and contrary evidence, you still sincerely believed in the claims made by Donaldson et al., by Stalcup, and by Cashill. That's really no longer tenable. You've now exhibited dishonest behavior entirely on your own. It's not about being fooled by conspiracy theorists. It's not about giving people the benefit of the doubt on a controversial subject. No—you're straight-up lying now. |
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#2628 |
No longer the 1
Join Date: Apr 2007
Posts: 28,570
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__________________
As human right is always something given, it always in reality reduces to the right which men give, "concede," to each other. If the right to existence is conceded to new-born children, then they have the right; if it is not conceded to them, as was the case among the Spartans and ancient Romans, then they do not have it. For only society can give or concede it to them; they themselves cannot take it, or give it to themselves. |
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#2629 |
Illuminator
Join Date: Jul 2007
Posts: 4,066
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mikegrifith1, is it asking for too much for you to say what kind(s) of missiles were involved? And how many?
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#2630 |
Penultimate Amazing
Join Date: Sep 2011
Location: The great American West
Posts: 22,561
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Agreed, but to be fair those are materials chosen to have that effect. Hydraulic hoses are composed of an elastomer meant to provide a flexible conduit and a woven metal restraint layer intended to limit the elastic expansion of the container to a desired profile. I should point out that the brake lines in a large airliner contain segments of this same design and can operate at commensurate hydraulic pressures.
Rigid hydraulic actuators are not meant to be flexible in the bending mode, but will naturally have measurable strength—great or small—to resist bending moments: because they're objects and all objects can be measured in this way regardless of shape, composition, or intent. They're design to contain pressure, and that's a factor solely of tensile strength. Conversely I can design a part meant to withstand a substantial bending moment, but it may have poor tensile performance. If the design requirements do not need substantial tensile performance, that "deficiency" is not important. If, later, the part fails in tension due to some exceptional condition, you can't argue that it was unacceptably weak or that the tensile forces must have been suspiciously large because the part performed especially well in bending mode. Specifically, hydraulic actuator cylinders must contain pressure without expanding radially to the point where the fluid leakage around the actuator piston is unacceptable. So their walls will necessarily be thicker than the proverbial soda can. A soda can is allowed to expand elastically as it is pressurized. We simply don't care about its diameter. Similarly the designer of the hydraulic actuators for airliner landing gear isn't worried about anything besides axial loading and cylinder expansion. Loading the cylinder for bending isn't part of the design problem nor of the design margin for other effects. As to the claim that the cylinders withstand a 300+ kt slipstream; that is at best arguably true. Most of the actuators actually don't protrude below the nominal edges of the wheel wells and so are subject only to turbulence inside the well. And I don't have to belabor the difference between aerodynamic forces and hydrodynamic forces upon impact. On the Boeing 747 only two kinds of hydraulic actuator are (arguably) in full slipstream: the steering actuator on the nose gear, and the ankles actuator on the main gear. Necessarily the steering actuator is axial to the airflow, otherwise it couldn't push properly against the tiller. The ankle actuator is what pitches the main gear truck up to fit properly into the gear well, and down again on runway contact to plant all the wheels. The ankles-up configuration of the -74 on landing is one of its most iconic images. But the ankles actuator is comparatively tiny. In a hard crosswind landing, when the rear tires of the truck hit first and impose a rotation on the truck, a robust spline prevents yaw over-rotation. The actuator—which would be bending-loaded by such an over-rotation—is protected. This is the structural assembly working together to provide the emergent effect of design strength. When this assembly is compromised by, say, an onboard explosion, all bets are off. The "robust" hydraulic actuators are then possibly subjected to loads they were not designed or expected to withstand. |
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#2631 |
Illuminator
Join Date: Jul 2007
Posts: 4,066
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A very good explanation. I agree the hoses are different from the rigid actuators, but just wanted to poke at the implication that the ability to withstand internal hydraulic pressure equated to the ability to resist bending moments.
Also, Robust Splines Will be the name of my garage band if I ever start one. |
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#2632 |
Penultimate Amazing
Join Date: Sep 2011
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#2633 |
Penultimate Amazing
Join Date: Oct 2006
Location: Dog House
Posts: 26,116
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Spreading woo all over the internet. A legacy of woo.
https://www.usmessageboard.com/threa...#post-31528314
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"Common sense is the collection of prejudices acquired by age eighteen" - Albert Einstein "... education as the means of developing our greatest abilities" - JFK https://folding.stanford.edu/ fold with your computer - join team 13232 |
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#2634 |
Master Poster
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#2635 |
Penultimate Amazing
Join Date: Sep 2011
Location: The great American West
Posts: 22,561
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This is my favorite part.
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The person who wrote that is clearly not playing with a full deck of marbles. |
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#2636 |
Master Poster
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#2637 |
Penultimate Amazing
Join Date: Sep 2011
Location: The great American West
Posts: 22,561
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To be specific, read his next post where he tries to backpedal. It's...astonishing.
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#2638 |
Master Poster
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#2639 |
Philosopher
Join Date: Aug 2003
Location: Detroit
Posts: 8,386
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The person who
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If you would learn a man's character, give him authority. If you would ruin a man's character, let him seize power. |
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#2640 |
Penultimate Amazing
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