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[quote][i]Originally posted by RichR[/i] even though the wheels arnt driven per se - when the aircraft is on the runway/conveyor belt - it is through these wheels that forward propulsion is achieved surely! If the wheels and hence ground speed is set to zero - as the conveyor belt moves at the same rate as the wheels, the aircraft essentially would be stationary with NO forward propulsion! When on the conveyor belt, with no coherent wind conditions - there would be no difference between the relative air speed and ground speed, as the two are in contact - the two can only change once the aircraft has taken off as these two are the same, I dont see that forward propulsion would be gained Steve using your analogy; the toy car on the tread mill - in order to remain in equilibrium ( ie not move forwards or backwards) the force from your finger and gravity must be equal and opposite to the force generated between the tread mill and wheels - in order to move the car out of a state of equilibrium you will have to overcome the force of the treadmill - by applying an accelerant! this force would in no way be equal to the force required to move the toy car whilst not on the treadmill; it would be equal to the required acceration + the force required to keep the car in equilibrium as such, if no forward motion (thrust force) is made by the aircraft, no lift will be generated by the wings; the plane wont take off! thats in my opinion and I've been accepted to read a Masters of Aerodynamics at Southampton University starting September 2007 - although what do I know! [Edited on 24-05-2006 by LiVe LeE] [/quote]
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