Re: [PSUBS-MAILIST] jettisoning battery pods or other ballast

["Jens Laland" <laland@artematrix.org>]

Jon

I think your proposed release arrangement would easily suffer from frozen
threads after an extended period of no use.

** I'm curious how much effort is required to turn such a setup when there
** is 700 lbs or so to release.

Hans Techel's arrangement appears to offer something like a 2.5 to 1
mechanical advantage, which, in your case, the downward force required (by
the vertical threaded rod onto the locking hook) would be about 280 lbs.

Finally, you'll have the additional "help" from the the axial thrust
produced by the threaded rod.

To calculate axial thrust, I guess you could use this calculator, ref

http://www.engineersedge.com/gears/screw-axial-thrust-load-calculation.htm

Best regards,
Jens Laland





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