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Tie Down Straps - Help Needed
On Sep 19, 6:05*pm, wrote:
On Sep 19, 5:38*pm, sisu1a wrote: On Sep 19, 2:47*pm, "Bill Daniels" bildan@comcast-dot-net wrote: I one of them was Paul Hansen's Sisu 1A in California the other was a Schweizer in Texas - Houston I think. *Anyway there are dozens more stories of stakes pulling out leading to the distruction of gliders in the history of gliding. I don't think it's a matter of mechanical engineering, it's soil engineering. *Stakes will hold in turf or damp soil held together by strong roots. *The dry sand and gravel of western deserts just won't hold a stake no matter how cleverly it's designed. *Even half axle shafts driven in with a sledge hammer have pulled out. *The act of driving in the stake loosens the soil enough to prevent the stake(s) from holding making the whole I agree with Bill. *I did a test with the claw attached to my trailer jack and the wheel on a scale. *The claw pulled out of compacted decomposed granite in my driveway at about 250 lbs, came completetly out at 300, but this was aided by weed stop fabric under the DG. *The soil was damp to a great depth due the the Socal rains in January this year, but not soggy. *I doubt that dry, uncompacted sand would do better. I have the claw in my Cirrus as an emegency tie down only, I think it is a good product for that application. For permanent tie downs nothing like a tire buried with a chain around it. *One the sand is watered down, it is not goining anywhere. Mike Malis. Ditto. I think the claw is a good option as an landout or similar situation. I've tried a few screw in types and you just cant get them into either the hard compacted dirt or rocky soils in many locations. The best place for the glider to be is inside it's box or a hangar. Otherwise get a real tie down installed, the claw and screw-ins are all completely inappropriate for permanent tie downs. It is not that hard to dig a hole, sink some anchors and fill with concrete. Darryl |
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