Hey Tom,
I have rebuilt a few military mast systems that are similar to what you want
to build. The two that I am familiar with are the AB-903/G and AB-1386/U
systems:
http://www.willburt.com/milQeamMast.asp
The AB-1386/U is 33 ft. It is made of five aluminum sections of diameters
4, 3.5, 3, 2.5 and 2 inches. Each section is about 7 ft 6 in long, so each
overlaps by about 1-1/2ft. The aluminum is T6-6061 grade structural with
0.065" wall thickness. I have had no problem with about 30lbs and 5 s
After totally rebuilding a few of these I think a mast of equal function
could be built pretty easily. You would need a flange with a pully at the
top of the first four each sections and Of you use the easilt
On Fri, Mar 7, 2008 at 8:27 PM, Tom Sneden, K6VCR <k6vcr@cox.net> wrote:
>
>
>
> OK, I see that there might be some interest in receiver hitch type masts.
> I have been working out a design for a tubular tower that will attach to a
> receiver hitch.
> My goals are that it nest at about 10ft, extend to at least 35ft, be
> rotatable from the bottom, tilt over (in the 10 ft collapsed position)
> with
> a winch, extend using a winch and not weigh over 350 pounds.
> Basically a miniature version of an MA-40 with the rotating fixture.
> It is do-able and I think the price point will be in the neighborhood of
> $600.00 for parts.
> I lack formal engineering education and would appreciate knowledgeable
> opinions regarding wall thickness and type of aluminum tubing to use for
> the
> mast.
> This thread has really opened my eyes to height issues and would like to
> discuss the optimal vs. practical height issue as well.
> Tubing is available in varying wall thicknesses and they need at least
> 3/16"
> clearance between ID of outer tube vs. OD of inner tube.
>
> Before I ramble any further, would anyone else be interested in this
> thread?
>
> Tom
> K6VCR
>
>
>
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