There's SS U-Bolt information in the archives; Here's what I did:
http://lists.contesting.com/archives//html/Towertalk/2003-07/msg00391.html
Since this post I also purchased stainless steel muffler clamps from Summit
Racing (NO8D) for sizes that I couldn't find at McMaster Carr.
Can anyone help Jim?
Cheers,
Steve K7LXC
TOWER TECH
> The VE1JF contest team is getting set to bring in the 154' boom
truck and do periodic overhaul, maintenance and upgrade on
the 48-el F12 3-stack overlooking saltwater to the horizon in Nova
Scotia.
As we bring down tower-accessible elements for preliminary
inspection and triple rows of rivets (per N6BT recommendation
because of our cliff-airfoil-uplift and hurricane winds here) most
of what I am finding looks really good after several years of
extreme wx. The aluminum continues to look great after
the F12-recommended XIM400 coat before it first went up,
very few rivets have failed and I am sure the triple-row
9ea F12 rivets per joint, moved back from the end of the
upper tube per N6BT recommmendations, will provide
an extra margin of safety and performance. Tom has
kindly engineered and produced new super booms for the
C51XRNs, with 6" square heavy stock at center, although
the other booms have so far survived, with some signs of
wear. He says the new ones will surely outlast both of us
and I am sure he's right. With all these changes, I bet
the wind rating is way above the original H rating--maybe
Tom should initiate an HH product line!
What does NOT look good is the original U-bolts--badly
corroded and some fractured in the course of retrieving
the elements. My rigger tells me to get stainless steel
ones, but so far I have not found any in Nova Scotia although
the search continues.
I need 90 of the small ones, of a size common with the C31XRH:
1 5/8" center-to-center
2 1/2" long
1/4" thick
1/2" side-to-side hex nut with lockwasher
no yoke
Also, I need 10 of the larger ones, used only on the N-series
40M elements:
2 5/8" center-to-center
4" long
5/16" thick
9/16" side-to-side hex nut
plus lockwashers
plus yokes
...and a few spare nuts and lockwashers in case some
get dropped from the tower into the underbrush.
Sources would be appreciated. The project is
now waiting for this, and a major hurricane season
is predicted (usually timed late up here when the
water has had time to warm up somewhat) so I
want to keep this project moving and get the
work done before prevailing winds make it even
more challenging.
73,
Jim Fisher, VE1JF, (902) 532-7474
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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