Use of a block and tackle with 3:1 mechanical advantage will reduce the load on
the gin pole a
whole bunch.
Stan w7ni@teleport.com
Michael Tope wrote:
> Can anyone out there give me advice (anecdotal, analytical, or otherwise) on
> sizing a gin pole
> for structural integrity? I have a requirement to drop 24' of 1/4" wall 4130
> chrome moly into
> a Rohn 25G tower (estimate wt ~120 lbs). I currently have in hand a 20'
> section of schedule 40
> 6061-T6 water pipe (1.915" OD; 0.158" wall) which I hope to use for the job
> in conjuction with
> WB0W gin pole fixtures (pulley and bracket). The actual working length
> (measured from the
> bracket to the pulley) would be around 15' to allow for raising the the moly
> masts center of
> gravity (z=+12') above the top of the tower.
>
> My feeling is that the aluminum pipe should be adequate to the job provided
> that we take
> reasonable precautions to keep the load (mast) roughly collinear with the
> gin pole (e.g.
> minimize side load). Any comments on my assumptions would be appreciated,
> especially
> from those who have already performed similar feats.
>
> Thanks,
>
> Mike, W4EF/6
>
>
>
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