The airfoil is there in all cases, in this respect; as the sail aqttacks the
wind, reguardless of the angle, some air flows on both sides of the sail.
Wind flowing over the most leeward side of the sail creates a partial vacume
on that side, so with air pressure stronger on one side the sail is
"pushed" or "drawn" to the direction where the low pressure is.
Even with the wind directly astern, a low pressure is created on the front
of the sail, and the sail(boat) is drawn forward. Hope that is as clear as
I mean it to be. Welcome to the intoxicaion of sailing.

Dave Hord.

On Wed, 09 Feb 2005 08:49:14 GMT, "DAVE HORD"
scribbled thusly:

The airfoil is there in all cases, in this respect; as the sail aqttacks
the
wind, reguardless of the angle, some air flows on both sides of the sail.
Wind flowing over the most leeward side of the sail creates a partial
vacume
on that side, so with air pressure stronger on one side the sail is
"pushed" or "drawn" to the direction where the low pressure is.
Even with the wind directly astern, a low pressure is created on the front
of the sail, and the sail(boat) is drawn forward. Hope that is as clear as
I mean it to be. Welcome to the intoxicaion of sailing.

Dave Hord.



OK, that's Bernoulli.

Now I'd suggest you look into Newtonian explanation of lift
ie deflection.


Oz1...of the 3 twins.

I welcome you to crackerbox palace,We've been expecting you

It is a simple matter to derive "Bernoulli" using Newtonian equations and
principals. They are the same thing. One common mistake people have with
Bernoulli is using scalar speed and not vector velocity. If you use scalar
speed, Bernoulli is then only valid in "one" dimensional flow like that
approximated in pipes. Pipe flow observations is what Bernoulli used to
formulate his equations.

Mark

"Capt. Mooron" wrote in message
news:bqKOd.17903$K54.4882@edtnps84...
On Wed, 09 Feb 2005 08:49:14 GMT, "DAVE HORD"
scribbled thusly:

The airfoil is there in all cases, in this respect; as the sail aqttacks
the
wind, reguardless of the angle, some air flows on both sides of the sail.
Wind flowing over the most leeward side of the sail creates a partial
vacume
on that side, so with air pressure stronger on one side the sail is
"pushed" or "drawn" to the direction where the low pressure is.
Even with the wind directly astern, a low pressure is created on the
front
of the sail, and the sail(boat) is drawn forward. Hope that is as clear
as
I mean it to be. Welcome to the intoxicaion of sailing.

Dave Hord.



OK, that's Bernoulli.

Now I'd suggest you look into Newtonian explanation of lift
ie deflection.


Oz1...of the 3 twins.

I welcome you to crackerbox palace,We've been expecting you

Hmm, I still have that High school graduation project I did a few years
back. I explained in it how most of that works and a couple other things
with vector format and diagrams. If anyone wants it just email me.

"plugster" wrote in message
nk.net...
It is a simple matter to derive "Bernoulli" using Newtonian equations and
principals. They are the same thing. One common mistake people have with
Bernoulli is using scalar speed and not vector velocity. If you use
scalar
speed, Bernoulli is then only valid in "one" dimensional flow like that
approximated in pipes. Pipe flow observations is what Bernoulli used to
formulate his equations.

Mark

"Capt. Mooron" wrote in message
news:bqKOd.17903$K54.4882@edtnps84...
On Wed, 09 Feb 2005 08:49:14 GMT, "DAVE HORD"
scribbled thusly:

The airfoil is there in all cases, in this respect; as the sail
aqttacks
the
wind, reguardless of the angle, some air flows on both sides of the
sail.
Wind flowing over the most leeward side of the sail creates a partial
vacume
on that side, so with air pressure stronger on one side the sail is
"pushed" or "drawn" to the direction where the low pressure is.
Even with the wind directly astern, a low pressure is created on the
front
of the sail, and the sail(boat) is drawn forward. Hope that is as
clear
as
I mean it to be. Welcome to the intoxicaion of sailing.

Dave Hord.



OK, that's Bernoulli.

Now I'd suggest you look into Newtonian explanation of lift
ie deflection.


Oz1...of the 3 twins.

I welcome you to crackerbox palace,We've been expecting you

Sebastian Miles wrote:
Hmm, I still have that High school graduation project I did a few years
back. I explained in it how most of that works and a couple other things
with vector format and diagrams. If anyone wants it just email me.

Sure, I'd like to see it. (email sent)

DSK