Re: [bolger] Telescoping Mast

From: "Roger Dewhurst" <dewhurst@...>
To: <bolger@egroups.com>

>
> Perhaps someone could design a hydraulic mast. Pump some oil in the
bottom
> and the top goes up like a car jack! It would need some decent oil seals
> though. Tell me if you find one please.
>
Roger,

They have them on some elevators. Also they make antenna mast that
extend with air pressure. Some of these are sturdy enough to use as
mast. An inquiry on the amateur radio antennas news groups would
probably turn one up.

I would still worry about failure in heavy seas setting off a cascade of
events with very negitive outcome.

Gordon

Gordon Cougergcouger@...

Stillwater, OK www.couger.com/gcouger
405 624-2855 GMT -6:00
A Folding mast would be a lot easier to make and more reliable
thantelescoping. You would have a hard spot in a telescoping
mast where the two sections over lap and you would have
to make a hard spot to pin the mast.
 
A hinge wouldn't be as pretty but it would be a lot easier to
fix when it stuck than a telescoping mast.
 
A hinge near the base and sockets up the mast might
be the easiest.
 
I could worry about a telescoping mast failing and going
through the bottom of the boat.
 
Gordon    W5RED
 
G. C. Cougergcouger@...  Stillwater, OK
www.couger.com/gcouger
"You miss 100 percent of the shots you never take."   - Wayne Gretzky
 

 
----- Original Message -----
Sent:Friday, April 21, 2000 9:40 AM
Subject:[bolger] Telescoping Mast

Dear List members,
    has anybody espied a successful (or otherwise) design for a telescoping mast.?
I'm thinking of the order of three 10ft sections, not a massive unit.
For use in trailering, negotiating low bridges, fixing jammed halyards etc etc.
Thanks in advance.
Jeff Gilbert
Down Under, where Winter approaches,although this doesn't
seem to worry the Tasmanians who are busy plyingBass Strait in
 the 12th running of the Examiner Three PeaksSailing/Mountain
Running Race (reports on http://www.threepeaks.org.au/ )
 
Automatic, Safe, Reliable Backups and Restores.
At 00:40 22/04/00 +1000, you wrote:
>Dear List members,
> has anybody espied a successful (or otherwise) design for a telescoping
mast.?
>I'm thinking of the order of three 10ft sections, not a massive unit.
>For use in trailering, negotiating low bridges, fixing jammed halyards etc etc.
>Thanks in advance.
>Jeff Gilbert


Perhaps someone could design a hydraulic mast. Pump some oil in the bottom
and the top goes up like a car jack! It would need some decent oil seals
though. Tell me if you find one please.

Roger Dewhurst.