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Question from William, forwarded to CAL-TECH Kite Obelisk Team:Vincente; There is something wrong with those numbers.> Dynamic force at 20 mph is very close to one pound per square foot. If a kite wing of 420 sq.ft. could achieve a coefficient of lift of one, it could lift 420 lbs. Very high lift airfoils can achieve lift coefficients of perhaps 2.5, in which case 420 sq.ft. might lift 2.5 times 420, or 1050 lbs. Not very close to 6900 lbs.http://obelisk.caltech.edu/home.htmlCAL-TECH:Indeed. Parafoils and foil kites have a very high lift-to-drag ratio. This can be seen by the fact that if flown as a kite, either one will quickly settle into a position close to 90 degrees from horizontal above the tether point. At this point the angle of attack is very low and so is the lift. If a parafoil's lift at 0 angle of attack was more than the weight of the skydiver, the guy would never make it to the ground! In fact the guy who sold us that parachute said it would pull no more than...
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