[TowerTalk] 66-Foot Vertical (overlap of tubing)

[Joe Reisert]

Roger etc.

A good rule of thumb for overlapping tubing  it to make the overlap 
at least 3 times the diameter of the tubing. Hence a 2" tube needs a 
minimum of 6" overlap and a 1" tube is only 3". This rule has never failed me.

73,

Joe, W1JR


At 02:13 PM 3/14/2009, Roger (K8RI) wrote:


>Dick Williams wrote:
> > <snip>
> >
> > So, all said and done, I think 3" overlap is enough to provide adequate
> > strength in the joint.
> >
> >
>Agreed although it does depend on the length of tubing beyond the joint
>plus the wind area.
>I chose 1' arbitrarily as I like to be on the safe side. A number of the
>commercial antennas here use from about 3" to 8" (I'd have to measure to
>be sure...or find the manual)  One I'm thinking of is the AV640 which
>IIRC uses a fair amount at the base and little near the top.
>
>73
>
>Roger (K8RI)
> > Dick K8ZTT
> >
> >
> > ----- Original Message -----
> > From: "Roger (K8RI)" <K8RI-on-TowerTalk at tm.net>
> > To: "TowerTalk" <towertalk at 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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> >>
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