With 160 square feet of sail what kind of load on a stay should I
expect.

Any basic formula? Or do I need to get somes sort of scales together

Reason I ask Im putting an inner stay back on, that was removed when I
replaced the anchor windlass. I found a Navy #1 made in 1910 that is
hot dipped galv on cast iron in mint condition. Hate to do it but, I
need to tap the top of the bollard to attach the stay and want to use
the smallest size bolt that will suffice.

The old system was a electric winch P.O.S. that had the inner stay
welded to the case.



Thanks in advance

Joe
MSV RedCloud

Joe wrote:

With 160 square feet of sail what kind of load on a stay should I
expect.

Any basic formula? Or do I need to get somes sort of scales together

Are you talking about a shroud or a stay? Stays need to be sized to the
righting moment of the vessel, plus the tension of opposing stays.
Forestays and backstays tend to be more highly loaded, and should be sized
by mast compression.



Reason I ask Im putting an inner stay back on, that was removed when I
replaced the anchor windlass. I found a Navy #1 made in 1910 that is
hot dipped galv on cast iron in mint condition. Hate to do it but, I
need to tap the top of the bollard to attach the stay and want to use
the smallest size bolt that will suffice.

The old system was a electric winch P.O.S. that had the inner stay
welded to the case.

It sounds like you're talking about an inner forestay, which can be any
size you want.

If it were me, planning to fly a sail from it, I'd size it to match the
standng forestay or perhaps one size smaller. An inner forestay is a great
safety feature and useful for flying storm jibs from. Not something you
want to use 'minimum size' IMHO.

Fresh Breezes- Doug King

So what size should he use?

Cheers MC

DSK wrote:

Stays need to be sized to the
righting moment of the vessel, plus the tension of opposing stays.
Forestays and backstays tend to be more highly loaded, and should be sized
by mast compression.

DSK wrote in message ...
Joe wrote:

Hate to do it but, I
need to tap the top of the bollard to attach the stay and want to use
the smallest size bolt that will suffice.

The old system was a electric winch P.O.S. that had the inner stay
welded to the case.

It sounds like you're talking about an inner forestay, which can be any
size you want.

Yes an inner forestay

If it were me, planning to fly a sail from it, I'd size it to match the
standng forestay or perhaps one size smaller.

I have the forestay. Every stay on the boat is overbuilt. Oversized
for ruggedness.

I'm going to be drilling and screwing up a hot dipped galv finish. So
to minimize damage I want to use the smallest size that will suffice.

My plan was to find a gusstimate working load and multiply that by 4.

So if I know the load is approx 1000 lbs than I would select a bolt to
secure the stay with a 4000 lb working load, 12000 lb breaking load.

So...what do you think the load might be?

I have a 100 % for the inner fore sail and plan on using it with the
100 jib on the forestay. During a storm I have a 50% for the inner
made of 9.25oz fabric.


Thanks
Joe




An inner forestay is a great
safety feature and useful for flying storm jibs from. Not something you
want to use 'minimum size' IMHO.

Fresh Breezes- Doug King