Bebo

MAZDA MX-5 Drivers Group <MX-5Drivers>

"MX-5Drivers"

	Brain Training	690 Tage her
	If an aeroplane is on a treadmill that is going backwards at the same speed that the plane is going forwards, would the plane take off? Assuming that the treadmill is the same length as a normal runway.
	geschrieben von MAZDA MX-5 Drivers Group

6 Kommentare:

	Mark Talbot hat gesagt...	690 Tage her
	No. In a word.
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	Warren Clokey hat gesagt...	689 Tage her
	Agreed. No. The Velocity of the plane is 0. Well in relevance to the surface of the Earth. The speed is irrelevent. Finally physics has come in useful.
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	June L hat gesagt...	689 Tage her
	I knew that too! And I didn't do Physics at examination level at school!!!! Do we all get gold stars? And extra playtime?
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	Peter C hat gesagt...	689 Tage her
	The response from an old pilot: There is no coupling between the wheels of the aircraft and the treadmill - not like a wheel-drive car. A car would stand still. Consider first an aircraft at flying speed going down the moving treadmill with its wheels touching. The aircraft is flying and thus moving relative to the earth, but its wheels will be getting dragged around at twice their normal speed. So, for take off, as the aircraft increases its engine power and starts to accelerate its wheels will begin to spin quicker as the treadmill moves faster under it, but the main effect in play is the increasing airspeed due to the thrust of the engines. It will take off. Go on - tell me I've fallen into the trap!
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	Dave Patey hat gesagt...	689 Tage her
	I'm going to say no, but for a different reason. Treadmills generally only travel up to about 5 or 6mph, which is too slow for the aircraft to generate enough lift to take off. When do I collect my prize...?
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	Peter C hat gesagt...	689 Tage her
	When someone asked me the question ... the questions folk ask me are amazing and broad in scope ... I did say that a treadmill doing 150mph that was 8000' long would be a tad expensive (even if engineers could make it) – reminds me of a chat I had with a chap who made bog roll machines (these run at 100mph+ and cost many millions of quid) but are gentle enough to process toilet paper. I did go on to ask if its carbon footprint was important ... So it’s clearly a technical conundrum. He didn’t let on why he needed to know!!
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