[TowerTalk] supporting a 40 meter rotatable dipole with trusses

[john at kk9a.com]

You're against drilling holes, how significantly does drilling a hole
effect the element strength? When I lived near Chicago I had a homebrew
full sized 40m beam. I drilled the tubing and used eye-bolts to attach the
Phillystran truss.  I also had a 90++ ft 80m dipole also with drilled
elements for the loading truss. The trusses were in the larger tubing
sections where pieces overlapped (double thickness) and I never had the
tubing fail, even in Chicago winters.

John KK9A


From:	terry burge <ki7m at comcast.net>
Date:	Mon, 13 Aug 2018 16:40:04 -0700 (PDT)

Been working on my 40 meter rotatable dipole I plan to put up at 124 feet or
so. But I'm worried about making sure whatever I come up with to fix the
3/16"
dacron truss lines to the elements out about 20' or so are secure. Dealing
with
the DXE tubing when it gets down below 1" or so I don't want anything too
heavy. Also don't want to drill and weaken the dipole. I actually came up
with
some 'rings' from Wilco just about the right size that would slip over the
0.5", 0.625", 0.750" to I believe the 0.875". There I could use 1/2"-1 1/4"
hose clamps to make sure the ring doesn't slip further up. Just the dacron
wrapped around the ring might be enough to keep that from happening but I
don't
trust it.


I'm not sure I could trust just using the hose clamps to hold the dacron line
but I don't want to drill and weaken the tubing in any way.


Any better idea? You can see a few pictures of what I'm building on my
QRZ/KI7M
page.


Terry

KI7M