silverback wrote:
"Jeff" wrote in message

The wind force on the typical 30 foot sailboat in a 30 knot breeze is
about 700 pounds. And that's without the sail up.

That statement is without fact, merit nor credence.

I'm just quoting from the ABYC ground tackle load table.

Actually, if you can keep the boat aligned perfectly to the wind, the
wind would be load would be a lot less, but the anchor loading table
assumes a fair amount of yaw. On the other hand, if you're hauling
the boat out and a gust comes in from 20 degrees off line ...

And the force of the sails must be considerable, and would add to the
tendency to yaw.

I use to sail my 25 footer without firing up the engine for a season. One
of the few times I used it was to raise a well set anchor in a crowded
anchorage with a strong breeze. Even though I was 30 years younger, I
could just barely haul the boat up to the anchor with sails set, and that
was probably 500 pounds on the rode.

A complete load of hogwash Jeff. Even if the forces approched such herculean
parameters.... the winches would compensate easily.

Ah, winches! I thought you were doing this hand over hand! Yes, give
me a fulcrum ...



I bet even Ole Thom could easily manage a 40 footer. The only thing to
overcome is inertia....
With a 40 footer, the strain goes well over 1000 pounds. Yes, there are
probably a few tricks you can play, but just hauling hand over hand isn't
going to do much.

What is it about inertia you people can't seem top fathom? Once the vessel
starts moving in a direction it is easier to maintain that movement. It's
not a matter of strenght... it's a matter of smarts

There is no way a 30 or even 40 ft sailboat places a 700lb static load to a
mooring when into the wind. Surge loads are not viable for this equation
since they can be timed out.

Actually, its the yaw that increases the projected area to create the
high force. Surge was not included, but Van Dorn and others predict
surge in storm doubles the loading again. Of course, I hope you're
not doing this in a storm surge, but any surge (or current) would not
help the inertia thing at all.

Its actually pretty easy to see it for a larger boat: the frontal area
gets up over 100 feet. Add another 40 or 50 for the mast, rigging,
lifelines. Drag coefficient is easily 1, may higher for a cruising
boat. Dynamic pressure is 3 pounds per square foot at 30 knots. So
before we consider yaw or the sails we're up to 450 pounds or more.

BTW, Dynamic pressure goes down to 1.3 lb/ft**2 in 20 knots, so if its
just gusting to 30, then this gets a lot easier.

And I did admit that there probably was a way to do it. Its just not
as easy is you make it sound.


Now here is the kicker Jeff... I indeed have hand over handed my 6 ton
sailboat into 30 kt winds from a lee dock in Great Slave Lake. It wasn't
really that difficult.

Gotcha! Before you claimed you did it all the time, now you're
admitting maybe you did it once.

And its well known that the dynamic pressure of the wind that far
north is a lot less. Coriolis force and all that. Ask Jax.



If you say it's not possible... I have to assume you've never actually
attempted it. Until you do... refrain from further input. You know not of
what you speak.

Actually, I was doing it on my smaller boat, but fired up the engine
because the anchorage was crowded and my crew very inexperienced.

But, you're avoiding the real point. Are you really claiming that
this is the best way for Ellen to get her 18 foot, 1200 pound boat off
the dock? Is this really what you would do??? I would just hop in
and sail it away. Maybe I ask someone to give a push.