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Go Back   SailNet Community > Skills and Seamanship > Learning to Sail
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  #31  
Old 12-19-2012
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Re: Heavy winds?

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Please make sure to emphasize "... YOU ARE the "BEST LOOKING..." SOunds better that way. Also helps to keep my fellow male mods (the not good looking ones) in check!!

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  #32  
Old 12-22-2012
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Re: Heavy winds?

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Originally Posted by lapworth View Post
I was out the other day with a cold North wind on the bay. There was only a few white caps so I believe the wind was around 12 knts at most. I like to get the boat moving between 3.5 to 2.5 knts. I am trolling. Almost all summer there in these conditions I would use small jib and main. Yesterday with this setup I was doing almost 5. So I reefer and that only slowed me down to 4-4.5. Finally decided to drop main. Now I was sailing at 3-3.5 knts. Are cold winds heavier then warm winds making your boat sail faster. Also i was sailing across channel so current would be a very small factor.
To answer your question, air density at 80 degrees is 0.070 lbs./cubic ft. while at 30 deg. it's 0.081lbs. But since the major driving force was the Bernoulli effect, I think that the cold air gives a different perception, imho.
Dick
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  #33  
Old 12-22-2012
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Re: Heavy winds?

This is way out of my limit . Bernoulli did most of his work of I think in fluid dynamics. Fluid that you can not compress. Air can compress more than fluid. Some fluid can because it has gases inside. I fly, I sail I fit pipe with fluids and gases and changing of state from gases to fluid super heat and so on. This could be the point when we need to ask the PE to explain. I will just have to take his word he will pull out a lot of math with letters an such, I will stay with my first and the majority. Cold air has more lift and power. Any PE want to jump in this? Regards ,Lou
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Old 12-23-2012
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Re: Heavy winds?

My question about the anemometer - mine is three little cups on short plastic arms, all of which rotate about an axle. When the wind is making the whole mess rotate, it's more or less "filling" one of those cups at any time, but the other two are heading (backwards) back into the wind. Maybe nice weather stations take temperature into account when converting shaft rpm into wind speed?

Air feels a whole lot heavier when riding a motorcycle without a windshield. 23 degrees is the coldest I've ridden any real distance. Noticeably different lean-forward angle compared to 95 degrees. Not that I care at 23 degrees. I'm just cussing and hanging on for dear life.
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Old 12-23-2012
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Re: Heavy winds?

With an anemometer the cups are pushed, on the 'wrong way' side of rotation you're fighting the drag.. I think the density difference will even out/cancel in this case.

Bernoulli is an 'easy' way to explain lift but it's not the true science.

As an extreme illustration, think of standing on a dock with 5 knots of wind.. no problem... then go stand in a creek with 5 knots of current running... good luck staying on your feet. Same velocity a lot more force....
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