Thank You David Paule for the "stretchy rope" explanation. It seems to me that all these airport tie downs are designed around a tailwheel airplane. There should be a tie down point for the nose wheel on a tricycle airplane. If one looks at the position of the wing tie down points and the gear as a pivot point on many tricycle airplanes, the angle of attack of the wings can change relatively easy is a strong wind. I think we would lose far fewer airplanes to winds if a complete redesign of tie down locations on airplanes and airports be considered. (Not going to happen-I know) ....
Another tip that only works if you know the wind direction in advance and the direction stays constant, which is often the case here, is to position the place so the wind doesn't hit it head-on but at an angle. You don't want the wind to come from the rear at all, though. The idea here is to reduce the lift on the wings.
That is roughly what stretch is for 3 strand nylon vs a high performance line like dyneema. (And roughly 30% stretch for nylon at breaking point)
Add that to difficulty in getting larger nylon line tight,….and planes can start bouncing around.
Flip side is that if you fail to get a high performance line tight,…. There will be a real “jerk” (loading spike) when it is pulled tight with movement
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Wallace & Marietta Goodloe
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