[TowerTalk] pipe masts

[Bruce Richards]

It will bend like a noodle with any thing more than a flag on it. You could get
by using high carbon steel sections, but thet are not cheap............Bruce

Frank T. Brady wrote:

> I'm putting some schedule 40 pipe together with coupler/reducer fittings to
> form a sturdy guy anchor/flagpole. The bottom is a 10 foot section of 3"
> pipe, coupled to a 10 foot section of 2 1/2" pipe, coupled to a 10 foot
> section of 2" pipe. About 4 feet of the bottom section will be imbedded in
> concrete (with a threaded coupling or bolts at the bottom to 'grip' the
> concrete).
>
> Although the pipe supply place seemed to agree that this would be a sturdy
> structure, I thought I'd ask the list members if you agree (this is a 50 to
> 70 mph 'zone' and a 3'x5' flag will fly from the top).
>
> Also, after seeing how strong this pipe is and the coupling fittings that
> are available, I realized that one could construct a fairly high steel mast
> out of this stuff.
>
> Is it very difficult to calculate the self-supporting limits and guyed
> limits of such a mast?
>
> I realize that I would have to have a crane drop the 'mast' into the hole,
> but a self supporting steel mast would sure be better than the 7 tiers of 3
> guys necessary for the H70 I've got on order (IF I can assure that a pipe
> mast is safe).
>
> The load is whatever is created by pulling the slack out of a wire antenna
> strung between the top of the two masts (something like 100 pounds max?).
>
> Also, the top load will be equalized by two back-stay guys opposed to the
> antenna pull.
>
> Thanks,
>  Frank T. Brady - W0ECS
>  Wildomar CA
>
> --
> FAQ on WWW:               http://www.contesting.com/towertalkfaq.html
> Submissions:              towertalk@contesting.com
> Administrative requests:  towertalk-REQUEST@contesting.com
> Problems:                 owner-towertalk@contesting.com
> Search:                   http://www.contesting.com/km9p/search



--
--------------------------------------------------
Bruce Richards / WD4NGB (No Good Bum)  (ex HL9JV)
DX Web Page http://home.sprynet.com/sprynet/wd4ngb
50 Miles North West of Nashville Tn



--
FAQ on WWW:               http://www.contesting.com/towertalkfaq.html
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 owner-towertalk@contesting.com
Search:                   http://www.contesting.com/km9p/search