With a boom truss, two lengths @ 15' for a 30' boom and a 3' piece to
fit inside for a splice. 1/8th in wall of a good alloy is plenty.
Use boom to mast and boom to element clamps that do not distort the boom
or elements.
I'm sure someone will have more spefic sizes.
73
Roger (K8RI)
On 5/25/2015 1:22 AM, Lee wrote:
I have been contemplating building a Moxon Yagi 40 meter beam for a
long time and I need to get started with the project. The bottom line
is I need a strong boom 30 foot long. I'll use a boom truss but am
thinking of aluminum around 3 inches in diameter and maybe 1/4 inch
wall thickness. I realize this won't be cheap. Maybe this is not
even strong enough for a 2 element beam. I live near Houston, so I am
thinking maybe an aluminum provider might be able to sell it to me in
one piece. (Trying to figure out how to connect affordable 6 foot
shippable pieces has kept me stumped from starting the project up
until now.)
I'd sure appreciate hearing suggestions on how to get the job done.
I'm not trying to do this on the cheap but the best reasonably
affordable way to do it. I'm thinking the cost of a boom like this
might be in the $300 to $400 range. (I don't mind splices, but where
to get large telescoping tubing? I wrote DX Engineering and they
discouraged me from using their tubing as they said it was not
intended for booms even though I wanted to beef it up with sleeves).
Boom diameter is a factor because cast boom to element clamps don't
come in every size. (I have purchased heavy duty aluminum channel
stock for boom to element connections to be used with aluminum cast
U-clamps.)
Any help would be appreciated.
Lee, w0vt
Houston, Texas
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73
Roger (K8RI)
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