SS Silv Posted January 31, 2006 Report Share Posted January 31, 2006 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). The question is: Will the plane take off or not? Will it be able to run up and take off? yes or no, I'm sure this will create a ton of different views and opinions, I've read on other forums where it went up to 70 pages... Link to comment Share on other sites More sharing options...
04CHASE Posted January 31, 2006 Report Share Posted January 31, 2006 after thinking about this for a few minutes i woul dhave to say even thouugh the engines are propelling the air plane to move on the belt i dont think it would have enough air/wind to lift the thing but its still got me thining , great question! Link to comment Share on other sites More sharing options...
mwalls54 Posted January 31, 2006 Report Share Posted January 31, 2006 no it will not fly Link to comment Share on other sites More sharing options...
zippy Posted January 31, 2006 Report Share Posted January 31, 2006 i would have to say no. you need wind to lift the plane. there wouldn't be enough wind created with it sitting still. Link to comment Share on other sites More sharing options...
SSleepingbeauty Posted January 31, 2006 Report Share Posted January 31, 2006 No, it would be no diferent than running on a treadmill or a car on a dyno. You are moving measuring speed but yet you are going nowhere. Link to comment Share on other sites More sharing options...
misterp Posted January 31, 2006 Report Share Posted January 31, 2006 Simple relativity - the wing needs to be moving in relation to the air around it; as long as the air is standing still around the wing, it is stalled. Mr. P. Link to comment Share on other sites More sharing options...
SSThunder Posted January 31, 2006 Report Share Posted January 31, 2006 not going to fly. Good question...makes you think Link to comment Share on other sites More sharing options...
geomcrider Posted January 31, 2006 Report Share Posted January 31, 2006 There will be very little movement: Even tho the propellers are rotating, the mass is stationary. Once you have the forward thrust of the plane , AND the propellers working together, the work (strain) required will lessen then you have your lift and movement. Take for instance one of those rubber band airplanes. Twist it up and get it under load.... release it and dont chuck it. It just about falls to the ground. Now do the same and throw it !.....You have flight For it to take flight as described by MrP, you would propably need to have a "HUGE" propeller and little mass. Then you dont even need the conveyor. my .02 George Arasimowicz Mechanical Design Engineer Edmunds Gages 45 Spring Lane Farmington, CT. 06032 Link to comment Share on other sites More sharing options...
TimC3 Posted January 31, 2006 Report Share Posted January 31, 2006 Is this assuming a prop plane or a jet? A jet I don't think would be able to move, because there is no wind over the wings, because the engines are usually mounted below or behind the main wings.. A prop plane that blows the air over the wings via the propellor might have a chance. Depends on if it can build enough low pressure at the top of the wing compared to the higher pressure at the bottom of the wing.. I dunno though.. My brain hurts.. DCairns.. we need your input here! Link to comment Share on other sites More sharing options...
BSER Posted January 31, 2006 Report Share Posted January 31, 2006 Lift is created by wind flowing over the top of the wing slower than the bottom of the wing. The difference in air speed causes a reduced pressure on the top of the wing which causes it to rise. The combination of wing shape, wind speed and angle of attack along with several other factors determine the amount of lift developed. So if the wheels are spinning at 100 knots and the wing is standing still relative to the surrounding air all you will do is were out the tires. I.E. no air flowing over the wing then no lifty...no lifty then no fliee. Another way to answer the question is to reverse it. In a wind tunnel the model aircraft don't move anywhere but they fly in the tunnel because the wind is moving over the wing. Steve you allways find new ways for me to waste time....lol Link to comment Share on other sites More sharing options...
Rays B4U Posted January 31, 2006 Report Share Posted January 31, 2006 No forward motion, no air being forced under the wing, no fly. Link to comment Share on other sites More sharing options...
zippy Posted January 31, 2006 Report Share Posted January 31, 2006 it would be funny to watch though. it would be like a plane exersizing. Link to comment Share on other sites More sharing options...
Ldogss Posted January 31, 2006 Report Share Posted January 31, 2006 nope Link to comment Share on other sites More sharing options...
04CHASE Posted January 31, 2006 Report Share Posted January 31, 2006 it would be funny to watch though. it would be like a plane exersizing. <{POST_SNAPBACK}> id definately watch that it be interesting to say the least! Link to comment Share on other sites More sharing options...
backinblack Posted January 31, 2006 Report Share Posted January 31, 2006 As everyone else has said it wouldn't fly there would be no air moving over and under the wings...no lift...no flight Link to comment Share on other sites More sharing options...
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