[TowerTalk] Weight of mast material
Jim White, K4OJ
k4oj at tampabay.rr.com
Tue Jan 20 23:47:31 EST 2004
Our moderator has spoken before about an additional element you must
consider regarding long masts... it is the dreaded:
Pucker Factor
This is when you are at the top of the tower juggling a behemoth mast
and it decides it wants to go in a direction other than the one you are
desirous of it attaining.
It is at this moment that your mind immediately recollects your high
school physics class and the wisdom of Archimedes...
When weight (chrome moly masting) that is at the end of a long lever
(the mast) - it is incredible how it can get so heavy SOOOO FAST!
As that weight's force vector takes on more of sideways component you
atop the tower tend to understand just what the
Pucker Factor
Is all about...
Yes, been there, felt that! Gulp...
I highly encourage a visit to the web site of K7NV, although not quite
as interesting as it once was, for tips on using physics to your
advantage... I am a big fan of the block and tackle and Kurt has some
great illustrations of it there.
It may check in at a dead weight of about 90 lbs but it will feel like
9000 if it gets sideways on you!
73,
Jim, K4OJ
Julio Peralta wrote:
> Thanks to all who replied RE: the weight of Chromolly. I think it would be safe to figure it a about 90#.
>
> Our radio club here in Tampa is considering using this mast to support a Force 12 C-31XR and a shorty 40, maybe the Cushcraft, on a Rohn 25 tower.
>
> Does anyone see a problem with the weight of the mast material in this application?
>
> The tower is planed for 70' and guyed at 3 points.
>
> Julio, W4HY
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
>
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