wnorth(at)sdccd.edu
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 Posted: Fri Jun 16, 2006 7:52 am Post subject: RV-List Digest: 29 Msgs - 06/15/06 |
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Paul,
to the contrare,
a yanking tug is more likely to pull it free than is a constant pull.
Hence the use of impact type drivers.
That's also the reason one puts chain on an anchor. The chain takes up the
"yank" of the boat so that the anchor has a constant pull as well as
changing the pull vector which tends to dig it in rather than pull it out.
The same is true for properly securing a boat, you always put a spring line
in during heavy WX because that yanking will tear the lines and or rip the
cleats out of the doc. A good spring will cause the boat to rotate and
wobble rather than snap at the end of its yank.
If your wings can lift 2500 lbs at 48 kts and yank and tug with however dang
much that momentum energy is (far more than an engine hoist hanging static)
and periphrial winds around a tornado easily exceed 100 kts as far as
several hundreds of yards away my feeling is that I want more than a
titanium curley fry stuck in the ground... truth is, I carry both, when WX
comes into OSH I throw it all into the ground. And then I pray.
;{)
and please do not archive this
While I'm sure the claw works great, I don't think the
kind of loads that these tie downs see aren't anywhere
close to what an engine hoist would pull. The loads
are going to be brief jerking when gusts of winds
might hit the airplane. An engine hoist is going to
progressively pull harder and consistently.
I've seen these tie downs hold down some buckling
airplanes with no problem. Plus, they screw into just
about anything without bending or breaking.
Paul Besing
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