Maybe we're talking two different things here.
I had 60 ft of 3" tubing up with guys at the
top and middle. The top guys failed in a wind
storm and the top half folded over. Same thing
happened several years later. I'm not making
this up. We're in an 85 MPH zone. If you do
the calcs, you can see that 30 ft of .050 wall
3" pipe is not self supporting at that speed.
> -----Original Message-----
> From: email@example.com
> [mailto:firstname.lastname@example.org]On Behalf Of Bob Maser
> Sent: Sunday, December 17, 2006 5:40 PM
> To: Richard (Rick) Karlquist; email@example.com;
> Subject: Re: [TowerTalk] 80m 4-square materials
> With all due respects, that is B.S. When I finally took my 63 ft
> down, I untied the last remaining guys, the ones that were at the
> 35' level
> and jumped back thinking they would come crashing down. To my surprise,
> they stayed up. Since I was not going to take the tubing with
> me, I grabbed
> one of the top guys and pulled. The damn things didn't buckle until the
> tips were close to the ground. Maybe this was because I had sleeved them
> internally with some steel conduit for the first 6 feet. True story.
> Bob W6TR
> ----- Original Message -----
> From: "Richard (Rick) Karlquist" <firstname.lastname@example.org>
> To: "Bob Maser" <email@example.com>; <firstname.lastname@example.org>;
> Sent: Sunday, December 17, 2006 8:25 PM
> Subject: RE: [TowerTalk] 80m 4-square materials
> >> but if I put up another 4 square with 3" irr. tubing I will only
> >> guy them at
> >> the 35 foot level because I removed the top guys about 6
> months before I
> >> actually took the array down and I had no problems, even with
> >> some strong
> >> Santa Ana winds. That tubing is strong stuff.
> > I know that at my QTH, about once a year, we get bad enough winds
> > to buckle 30 ft of unguyed 3" irrigation tubing. YMMV.
> > Rick N6RK
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