[Rhodes22-list] Mast hoist system

[Rik Sandberg]

Bob,

The only time there is really any sheering force on the winch pedestal is 
if a shroud would happen to tangle when the mast is almost all the way up 
and the winch is getting close to horizontal. If one is careful not to 
allow this to happen, or at least catches any tangles before he loads up 
the pressure, if it does happen, there is no reason to have a problem. As 
with most thing though, if one does not want to pay close attention, one 
could get into trouble. It's quite simple to stand and crank the winch 
handle and watch your shrouds, etc. while the mast is going up.

While the mast does usually swing out to one side a bit while raising, if 
you know that it will only go "so far" a nice steady cranking speed works 
just fine. One doesn't have to be in a big hurry. Take time to make sure 
that nothing is hanging up during your lift. It works best if you have 
adjusted the lower stays (the ones you have attached to the forward cabin 
top chain plates), quite snug when you start. The snugger you have them, 
the less the mast will move to the side before the upper shrouds take over 
and start pulling it back to the center again.

Rik


On Tue, 27 May 2003 08:40:31 -0700 (PDT), brad haslett <flybrad at yahoo.com> 
wrote:

> Bob,
>
> I'm assuming you found "never, never, land", somewhere
> around 45 to 60 degrees of mast angle where it is
> somewhat unstable and wants to go to one side or the
> other. Am I correct?  My boat (soon to be their boat)
> has the later model mast raising system with the
> forward mounting point for the hoist but if my high
> school physics serve me correctly it shouldn't make
> that much difference in the force required.  One of
> the keys is speed.  Assuming you have the shrouds
> connected correctly, there is still a period of
> instalibility somewhere there in the middle.  After
> several practices I found that speed through that
> period of instability is the key.  (It reminded me of
> rotation at takeoff on a DC-10 or manual gear
> retraction on a Mooney but that doesn't help much does
> it?)  The first time I raised the mast I did it very
> slowly and nearly scared the dogs**t out of me.  After
> a few attempts I did it at a high rate of speed and it
> went a lot smoother.  Having someone on either side
> holding a line attached to the mast would make it a
> no-brainer but the system is well designed and does
> work single-handed.  The forces change as the mast
> goes up/down but speed hides it.  There are a lot of
> folks on the list with a lot more experience than me
> and hopefully at least one will point out where I'm
> full of, well, let's hope they answer your question.
>
> Brad  --- Robert Dilk <Robert.Dilk at TRW.COM> wrote:
>> I lowered my mast ( 1975 standard sail) for the
>> first time this weekend. Let's just say no one was
>> hurt.
>>
>> I have looked at the pictures of the GB mast hoist
>> system and have some questions.
>>
>> I would have expected the lifting arm to be mounted
>> directly to the mast base to form a triangle. By
>> having the lifting arm mounted on the coach top
>> separate from the mast is there a lot of force
>> pulling on the mast base?
>>
>> My standard mast has a simple support with a slotted
>> hole for the mast bolt. Does the new system have
>> something special in the mast base?
>>
>> thanks
>>
>> Bob
>> S/V Knot Necessary
>>
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