January 16th, 2006 05:50 PM
Filght 213 for Dallas
Lets see how you guys ponder this.
A plane is standing on a runway that can move (some sort of band conveyer). The plane moves in one direction, while the conveyer moves in the opposite direction. This conveyer has a control system that tracks the plane speed and tunes the speed of the conveyer to be exactly the same (but in opposite direction).
Does the plane ever take off, and why or why not?
January 16th, 2006 05:55 PM
Wasnt this just posted recently? If not sorry bruce but i have seen it with in last 3 weeks soem where..
I say no .. no lift under the wings since plane it going one way and belt the other wouldnt it not get enough speed?
Im not a theoryist so its beyond me
January 16th, 2006 05:57 PM
Oh Bruce - hard day at the office ????
Well - air speed is everything so this would mean that instead of the usual V1 and rotate being shall we say 150 knots air speed - the plane's airspeed will never even occur!! All we'd have is two diametrically opposite velocities!!
Without airflow over the aerofoil of the wings there will be zero lift. QED! Ground speed does not count - or shall we say standing still.
What is described is a giant treadmill !
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January 16th, 2006 06:15 PM
I have seen it on a few other boards, I think its the first time here though.
Originally Posted by Bud White
January 16th, 2006 07:43 PM
If you bought a big enough fan that could produce 150+ knots of wind,You could get the plane off the ground at a standstill.
That's the concept of "wind tunnels" which is how they test prototype airplanes.
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January 16th, 2006 07:55 PM
That is why small planes have to be tied down.....something like a Piper Cub can get airborn in a good storm. I have seen a Piper going backward....headed into a stiff wind blowing faster than minimum air speed, ground speed was actually a negitive.
January 16th, 2006 10:00 PM
Can't get airborne. Need airsflow over the wings. Speed at the wheels doesn't do "squat"!
EOD - Initial success or total failure
January 17th, 2006 04:21 PM
Here's what happens when they're not tied down, or at least not well enough I took this picture at Raleigh-Durham International, 9/18/2004, the day after a windstorm with gusts over 60 mph.
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