|[AMRadio] Gin Pole for folding tower question - OT|
rickbras at airmail.net
Thu May 11 14:58:40 EDT 2006
My personal opinion is it will not withstand the first half of the
lift. I had a similar situation and it did not work. You might
consider using "drill stem".
Brian Sherrod wrote:
> Sort of off topic, however I know there are some really smart guys on
> that may know the answer to this;
> I've got a Rohn bx48 (48' light duty tower) that I would like to be
> able to
> fold over/up for any maintenance. It will have a Ham IV rotor/3 el.
> tri-bander and dipole pulley at the top. I plan to mount in the concrete
> base a 25' steel pipe 4 1/2" diameter with 1/4" walls directly behind the
> tower for raising and lowering to tower. The pipe will be 20 feet
> above the
> ground level with 5 feet embedded in the concrete tower substructure. It
> will have a pulley at the top of the pipe and a hand crank at about 4
> with steel cable attached to the tower at the 20 foot level. Question
> will 1/4" walled 4 1/2" steel pipe be able to withstand the foot lbs.
> required to raise and lower this tower below the 45 degree mark without
> buckling? Seems I can not find any pipe this size with larger wall
> around here. I could guy the pipe in the opposite direction if needed...
> Any mechanical engineers out there know the answer??
> Brian / w5ami
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