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#6
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Hmmm,
I have repaired maybe 15 broken booms including 3 that I have cardinal knowledge of and it is my humble opinion that the tail wheel dragging sideways has little to do with snapping the boom. In all 3 of my personal recollections, the tail was off the ground during the event (2 had wheels, 1 had a skid). I watched a Discus come as close as it could to breaking its boom when it landed beside me, only a bit deeper into the barley field at Camby, Ca The left wing tip caught a clump of barley and around it came, tail off the ground, spun 180, T-tail laid over a good 30 degrees, then the boom came down and she just sat there and shook for a moment. What determines weather you break the boom or not is speed, ground loop below 40 knots and you will probably come out unscathed, do it above 40 and she's likely to break (Libells reduce by 10 knots). What's really going on is simply this, The wing can take it quite well because it has a spar, the boom doesn't and one side goes into compression while the other is held in tension, compression looses and buckles inward, do it hard enough (speed) and she snaps off, tail wheel had very little to do with it. As always, just my humble opinion, JJ |
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