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A recent episode of Mythbusters on the Discovery Channel showed a taxi cab and a schoolbus getting trashed when put behind a 747 with its jet engines going "full throttle."
But while the cars were blown away, the jet didn't move at all. Why not?
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Because the brakes were on, and the engines are pushing against air – which doesn’t let them get much of a grip. It’s not like putting power to the ground through a grippy tire. Jet airplanes always use full throttle before taking off – even though they don’t start moving until the brakes are released.
It was a good show, wasn’t it? Loved that taxi!!
Brakes engaged + wheels chocked = plane stays put (in most cases, this one being one of them.)
The A-340 which was just destroyed as it was being preped for delivery, well, that’s a different story. 5h!t happens.
because the brakes were engaged
The aircraft braking system is designed to hold hold while 1 engine is a full throttle. If you apply more than one engine at full throttle it would of been a different story
Because the parking brakes were on.
Because the aircraft was tied down on a run-up pad. The landing gear are tied to anchors imbeded into the pavement behind the airplane. This is a common practice after maintenance is performed on aircraft engines. The engines are run up to insure they are operating properly at or near full power, and to synch the engine controls for all four engines.
I believe only two of the big jet’s engines were running at full power during this filming, but even at that… the brakes and wheel chocks would not hold the airplane with absolute safety for the length of time that they used for filming during this episode.
planes have brakes ya know.(and you can chalk the wheels) besides I saw the episode and only two of the engins were running.
As only two of the engines were at 90% N1, “full throttle” is a misconception.
While everyone is talking about the brakes…..and that’s certainly correct….there is one other factor.
Jet engines produce more power when moving foward than when static. As a jet begins to move….the total thrust reaction is increased by the mass of the incoming air. (air getting pushed into the engine as opposed to being sucked in)
So a stationary aircraft will be producing significantly reduced thrust.
only one engine was on and they had parking brake on
they turned on the brakes and had a couple blocks by the wheels