|[AMRadio] Gin Pole for folding tower question - OT|
wa9nqw at nconnect.net
Thu May 11 15:08:09 EDT 2006
Your may want to consider what Hy-Gain (before MFJ) did. Run a chuck of
cable at a 45 down the back side of your pipe into an earth anchor or
other suitable support. The one I have works great.
On May 11, 2006, at 1:58 PM, Rick Brashear wrote:
> 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
>> base a 25' steel pipe 4 1/2" diameter with 1/4" walls directly behind
>> 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.
>> 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 is;
>> 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
>> 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
>> Any mechanical engineers out there know the answer??
>> Brian / w5ami
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