theo102 Posted October 9, 2020 Share Posted October 9, 2020 Debunking American Moon (misdirection by conflation of audible vibration with visual and tactile vibration). 11. Given that, as confirmed by the debunkers, “the astronauts are literally sitting on the engine”, why don’t we hear any sounds from the engine during lift-off? The only way for sound to be transmitted into the cabin, given the vacuum outside, would be by making the interior of the cabin vibrate. The ascent engine did not contain fuel pumps, as it was pressure-fed, so there would not have been any vibrations from pump motors. Audible vibration could only have come from fluctuations in the amount of thrust from the engine. Therefore the absence of sound simply implies that the thrust was constant and did not cause vibrations inside the LEM. This rocket has 500lbs more thrust than the lunar ascent engine, but does not visibly vibrate during operation, so it's reasonable to assume the LEM ascent engine would also have not vibrated. Also, Tom Jones, a shuttle astronaut, says in this article that after booster separation during a shuttle launch he felt "almost no vibration", even though the shuttle's three main engines were still firing and delivering over a million pounds of thrust, "pushing us upward with a comfortable 1G acceleration". As long as the thrust is constant, there needn't be any significant vibration when a rocket fires. Absence of vibration would have meant absence of sound in the LEM. In fact, the noise during the ascent was described by Apollo 15 astronaut David Scott as being "like the wind was blowing through a window." Scott also said "This was very quiet. Very quiet. You heard a swishing sound". Source (entry at 171:38:05). Quote Audible vibration could only have come from fluctuations in the amount of thrust from the engine. This is false. Any rocket will produce audible vibration when it operates, like a hiss or a roar. Quote does not visibly vibrate during operation, so it's reasonable to assume the LEM ascent engine would also have not vibrated. Visible vibration and audible vibration are not the same thing. You can audible vibration with no visible vibration of a rocket engine. 1 Quote Link to comment Share on other sites More sharing options...
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