Jax says the curve of the sail does not effect the Driving Force on a
sailboat!

old man, you are lost to the world again. I said no such thing. I did say a
sail does not move a boat "because it is curved one side".

It seems you have had too much to drink so early in the day and don't
understand the words used.

Jax,

One final question for you ( That you will not answer)?

How in the Hell can a sail, made out of cloth, have ONE side curved
without the other having the same curve.

That is the nature of a fabric sail. Both sides have the same curve. If
this isn't so, you have to explain how it can be different and still be
a SAIL.

A absence of a reply is the same as saying Jax is wrong.

This is the final post on this Troll. Consider this my release of you.
If Nav wants to work you some more on the Syphon, that is between you
and him. I've had my amusement with you but you no longer entertain me.

Bye Little fishy. Go swim n the Gulf Stream (If you can find it)

Ole Thom

old man, YOU were the guy saying that a sail drove a boat forward "because it
is curved on one side" not me. Now you are arguing that can't be true because
a sail is curved on both sides.

duh.

so, old man, does the sail work because it is curved or not? make up what's
left of your mind.

One final question for you ( That you will not answer)?

How in the Hell can a sail, made out of cloth, have ONE side curved
without the other having the same curve.

That is the nature of a fabric sail. Both sides have the same curve. If
this isn't so, you have to explain how it can be different and still be
a SAIL.

A absence of a reply is the same as saying Jax is wrong.

This is the final post on this Troll. Consider this my release of you.
If Nav wants to work you some more on the Syphon, that is between you
and him. I've had my amusement with you but you no longer entertain me.

Bye Little fishy. Go swim n the Gulf Stream (If you can find it)

Ole Thom

Yes Jax,

The sail works because it is curved. It provides the force to move the
boat on a Reach and on a Close Haul.

Since you don't know why and are denying the statements you've made in
replies.Both about the curve and force vectors, it is time for
enlightenment.

I'll try. I was just made aware of the Newtonian Theory this past
season. This discussion group made me aware of it and I have brought
into it. So, I'm not pretending to be an expert BUT I damn well know why
the curve on the Lee side is necessary, I've done some studying;

Newton said for every ACTION there is created an EQUAL and OPPOSITE
REACTION.
So that Action on the lee side of the Sail causes the air to go in
a leeward motion. This is caused by the CURVE in the sail ( On a wing it
would be the curved section of the airfoil)
This Leeward action of the air away from the Lee side of the sail
creates a need for air on the Lee side of the sail. This need is
supplied by the relative stationary air, behind the deflected air
caused by the curve on the leading edge of the curved sail. This air
rushes against the Lee side of the after section of the curve sail and
slides off the leech of the sail. This Force of Air is the ACTION,
Newton Law needed to create the REACTION from the air on windward side
of the sail.
There is another action that takes place with the air sliding off
the Leech. It is called the COANDER EFFECT. This is caused by the
surface tension on the boundary layers causing the air sliding backward
to turn and aid the reaction force

Now, the curve of the Sail is necessary to keep the air in contact with
the sail (Boundary flow) until we want it to separate with the minimum
turbulence to allow the forward air to slide down and over the after
part of the sail

My apologise to all you informed sailors for my crude attempt to explain
Newton's Law (F=ma). To all but Jax who had his chance

I"ll need a:"DRINK TO THAT" for venturing where Angels fear to thread

Ole Thom

old man, a little knowledge is a dangerous thing. in your case, you have
damned little knowledge.

now, you are saying WHAT? that an airfoil wouldn't work if both sides of it
are curved, and curved in the same direction?

dude, maybe you might spend some time at any local airport, unless of course
you continue to believe that trash you spewed before that a verticle surface
acts under different air forces than a horizontal surface.

old man, give it up. you told one and all of your utter ignorance when you
said,

I was just made aware of the Newtonian Theory

[snip the rest of thomie's beer hall meanderings]

Jax,

You seem to be afraid to talk in terms of SAILING!

You go to the local airport. I have all the I have to see at the Harbor.
YOU SHOULD GO THERE. You just might learn something about SAILING.

Jax, you can't seem to complete the transition of the aircraft wing to
that of a flexible sail using Newton's Laws of Motion.

You can't seem to remember that it was YOU that turned me onto Newton
theory. It is a crying shame that you don't seem to have the ability to
convert the theory into practical usage.

Ole Thom

old man, you keep trying to tell us that air flowing over a verticle surface is
somehow different in its reaction to the surface than air flowing over a
horizontal surface.

Are ever have you been drinking/smoking/chewing?

Jax,

You seem to be afraid to talk in terms of SAILING!

You go to the local airport. I have all the I have to see at the Harbor.
YOU SHOULD GO THERE. You just might learn something about SAILING.

Jax, you can't seem to complete the transition of the aircraft wing to
that of a flexible sail using Newton's Laws of Motion.

You can't seem to remember that it was YOU that turned me onto Newton
theory. It is a crying shame that you don't seem to have the ability to
convert the theory into practical usage.

Ole Thom