stepable galvanized steel poles
- I have seen our local utility companies are using a hot dipped
tapered steel pole that appears to be able to be hinged down to have
the lighting fixtures maintained. This brings up the idea of being
able to step the mast for extended cruising under power or storage.
I like the idea of being able to get under some low bridges without a
major drama. and it would open up the posibility of taking on some
of the european canal systems or something like the intracoastal
waterways in the USA.
Adelaide, South Australia
That sounds to me like a good idea, and one that I will be exploring in more
depth when I finally get to building my own boat. I have plans and frames
for a Roberts Spray 33 in steel, which I plan to rig a a junk. I reckon you
can design into a steel boat the strength needed to deck step an unstayed
mast and build a sturdy tabernacle to hold it firm in a seaway. You can do
this by taking mast supports down to the keel and then diagonally through
bulkheads, etc to wherever the stress needs to be dispersed to. Any good
engineer familiar with steel and the loads imposed on a mast in a seaway
will be able to design it. Once a properly designed steel structure is fully
welded in place it is virtually indestructible in its normal use.
The tabernacle itself needs to be properly designed, of course, but that is
also only an engineering problem. It can seem scary to have an unstayed
mast deckstepped, but consider aeroplane wings, which take enormous
stresses. They too are unstayed, which would have been considered foolhardy
in the early days of aeroplane design. Now they support aeroplanes that
weigh hundreds of tons. It was just an engineering problem that someone
I first thought about this whole issue of deckstepped mast when living in
Perth, Western Australia. All boats moored on the Swan River have to pass
under the traffic bridges at Fremantle. I was at the time building a 53 foot
steel ketch, bermudan rigged. Both masts were deckstepped, and I could pass
under the bridges with ease. I also noted with interest that Rolly Tasker's
mighty ocean racer, Siska, with its 90 foot mast, was also able to fold it
down to get under the bridges - though getting it down was quite an
operation to watch! Rolly was a member of Royal Perth Yacht Club, which was
way up the river.
I still like the idea of the freedom of having deckstepped masts which can
be folded down when it suits me, and I can see no reason why it can't be
achieved with unstayed masts.
Websites that work! Clarity! Simplicity! Speed!
----- Original Message -----
From: "Mike Smith" <dominoconsultant@...>
Sent: Wednesday, March 05, 2003 9:50 AM
Subject: [junkrig] stepable galvanized steel poles
> I have seen our local utility companies are using a hot dipped
> tapered steel pole that appears to be able to be hinged down to have
> the lighting fixtures maintained. This brings up the idea of being
> able to step the mast for extended cruising under power or storage.
> I like the idea of being able to get under some low bridges without a
> major drama. and it would open up the posibility of taking on some
> of the european canal systems or something like the intracoastal
> waterways in the USA.
> Mike Smith
> Adelaide, South Australia
> To unsubscribe from this group, send an email to:
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
I agree! That's why I put a tabernacle on my little junk rigged West Wight
Potter. I can't see why it couldn't be done for larger boats as well.
C-Type WWP #44 "Bobber"
Port Arthur, Texas
[Non-text portions of this message have been removed]