I have seen a lot of discussion of "how much" overlap of tubing you need
when putting the sections together.
On my "homebrew" vetical I used 3" because that is what the 80 mtr beam I
used parts from used for the elements. As I mentioned in a previous post I
had three different "failures" before I got enough double wall to keep it up
in the winds I experience at my QTH.
I can say that none of my failures occured because of not enough overlap at
the joints. The failures were all above the joints and because the tubing
was not strong enough for the exposed length.
So, all said and done, I think 3" overlap is enough to provide adequate
strength in the joint.
Dick K8ZTT
----- Original Message -----
From: "Roger (K8RI)" <K8RI-on-TowerTalk@tm.net>
To: "TowerTalk" <towertalk@contesting.com>
Sent: Saturday, March 14, 2009 1:53 AM
Subject: Re: [TowerTalk] DX Engineering 66-Foot Vertical?
> Oops...
> <snip>
>> I can start with anything from 2 to 2 1/2 or 3". the sections
>> should have a 1'. What do I need? If need be I can take standard
>>
> That should have said I should have close to a 1' overlap (+ 2 or 3" - 0)
>> lengths, cut them and use the excess" I was told they charge by the
>> foot whether I use a full length or they cut it to length when I needed
>> some a few years back, which was a surprise.
>>
>> "I think" which means I don't know for sure, that "standard lengths" are
>> 6', 8', 10' and 12'
>>
>> That is what I'd give to the Aluminum shop in Saginaw. True I could
>> take any list of 6061 tubing and figure out what I need but the shop
>> could do it in 10% of the time and for very little charge.
>>
> 73
>
> Roger (K8RI)
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