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 Catalina/Capri 25/250 Sailor's Forums
 General Sailing Forum
 Radio/GPS Antenna Mast		  New Topic  Topic Locked
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ClamBeach
Master Marine Consultant

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3072 Posts
Initially Posted - 06/06/2004 :  13:33:18  Show Profile
I'm in the process of 'engineering' a short (6' tall or so) mast to mount my VHF and GPS antennas on.

For the mast I'm planning on using a 6' piece of 1" stainless rail tubing overlapped and double-clamped to one of the inboard vertical stanchions of the stern pushpit.

A flat plate or short section of rail "T" mounted to the upper end of the mast completes the setup.

I've found a variety of fittings that could be used... except for ready-made ones that could easily clamp the mast tubing to the stanchion. (tubing to tubing)

Has anyone out there done this particular project and found a nice tubing to tubing clamp ?

Photos, all advice appreciated.
WOTAM - '77 Catalina 25 SK/SR Sail Number 158
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OJ
Master Marine Consultant

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USA
4382 Posts
Response Posted - 06/06/2004 :  22:48:59  Show Profile
Bruce,

Too bad thay don't make stainless muffler clamps for 1" pipe with extra long U-bolts! When forced to use stainless hose clamps () I cut the tail off as close to the wormgear as possible - looks a little less tacky.

Good luck!
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 06/06/2004 :  23:09:53  Show Profile
I think I can find U-bolts to fit... what's needed is a double "U" sided clamping block to allow the pieces of tubing to snug up against one another nicely. If I don't find one, I'll make some out of UHMW. Somebody probably already makes one, but I haven't found it yet.

Am also contemplating running two verticals and a cross-piece... that would make a 'boom gallows' that could be used to secure the aft end of the mast when trailering and also be used as part of a cockpit tent etc. Toss the gudgeon-mounted mast crutch away. It would be one less thing to fool with when trailering.

BTW... Defender Marine seems to have the best prices on stainless tubing.
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OJ
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USA
4382 Posts
Response Posted - 06/06/2004 :  23:19:20  Show Profile
UHMW?
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 06/07/2004 :  09:39:49  Show Profile
UHMW = Hi-Moly = Ultra High Molecular Weight (plastic, usually polyethylene)

In one formulation it is used to make those popular white cutting boards... also the base material for 'Starboard' (a composite of fiber and UHMW plastic).

Easy to machine. The plain white stuff will degrade in sunlight after a few years though, I'll have to dig up some scraps of a different grade.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.