[TowerTalk] Adding Expanding Foam inside boom

Bob Shohet, KQ2M kq2m at kq2m.com
Thu Apr 26 09:20:39 EDT 2018

I would also expect that the rate and quality of the “curing” would be impacted by the ambient temperatures and humidity levels/climate at a given location.  In much of New England the temperature can easily vary by more than 120 degrees in the course of a year – and significantly more in the great plains states.  And the climate can very enormously from the generally wet/humid East to the desert SW. This has to have an impact.


Bob  KQ2M

From: jimlux 
Sent: Thursday, April 26, 2018 9:06 AM
To: towertalk at contesting.com 
Subject: Re: [TowerTalk] Adding Expanding Foam inside boom

On 4/26/18 3:34 AM, john at kk9a.com wrote:
> I'm not sure how you would completely fill a 12' piece of tubing with the
> foam and I think it would have the potential to trap water.  I like to
> keep my booms completely open (no end caps).
> John KK9A

the other problem is that the foam may not "cure" properly in a sealed 
(or nearly sealed) container.  The tesla coil community has fooled with 
this to make large toroids by doing stuff like filling a truck tire 
inner tube, or a ring of expandable duct, with the foam, in an attempt 
to "rigidize" it.

I think the take home from all those experiences is that "it depends on 
the brand and type of foam"

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