LEE BOW EFFECT

Originally posted by G.R.F.

Originally posted by G.R.F.

Originally posted by sargesail

No it doesn't!  The apparent wind is a combination of a moving volume of air (True or Ground wind) and a moving carpet (OK volume but in practice it's 2D) of tide (the tidal wind), and your boat speed and your angle to the wind (I'll call it induced wind).   Pinching or footing changes the induced wind but it can not change the tidal wind.

dude.. sailing 101.

True wind generates movement.
Movement generates "created wind" opposite to movement direction
Both True and Created combined = Apparent wind.

So
Favorable tide on lee bow increases apparent wind by increased vector pressure on true wind
Tide on weather bow decreases apparent wind inversely.

Edited for accuracy..

Dude - more accurate but still wrong.  

I wish we were drinking beer so that we could karate sail this or use tablecloths and or napkins to show the moving carpet effect of the tide.  Thus allowing me to prove to my satisfaction, but probably not yours (I was a persistent heretic once too) that the angle of the boat's motion to the tide is irrelevant in determining the "vector pressure".

Try it this way: it would be more accurate to say apparent (the wind felt by the boat) wind generates motion, but for a boat at rest movement generated wind is nil.

Now let's stop the boat from being at rest by adding some tide.  That creates a new wind which is a constant input to our equation.

Now when we take the brakes off no matter what direction and speed we sail at the true wind and tidal input to the forces we experience has not changed.  We can not generate increased pressure by taking the tide on our lee bow, or less by taking it on our weather bow.

Anybody else with me?