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 Catalina 25 Specific Forum
 apparent wind in light air		  New Topic  Topic Locked
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JimB517
Past Commodore

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USA
3285 Posts
Initially Posted - 06/23/2003 :  16:46:56  Show Profile  Visit JimB517's Homepage
On Saturday's sail we had light wind about 5 knots perhaps "gusting" 6 or 7. I didn't have the knot meter turned on but I suppose we made about 3.5 knots on the down swell legs, 2.5 knots up swell.

I tried to put the boat on a beam reach (maximum speed) to "thrill" my guests. What was interesting is, whatever heading (except dead down wind), as soon as we got moving the apparent wind clocked around and we ended up on a close reach - on any and every heading!

I used all the tricks in the book on this web site for light air - moved genoa tracks forward, eased the main halerd, eased the backstay, adjusted the traveller, eased the outhaul and vang, I forgot to ease the genoa halerd.

I don't really have a question here, it's just that was the first time I saw the effects of apparent wind so clearly.

I was busy all the time tweaking sheets. Guests seemed bored with sailing on a light air day and would prefer to just get where we are going while sitting still.

<img src="http://www.indiscipline.org/cat25/pictures/icon.jpg" border=0>Indiscipline 1978 FK #398
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John Mason
Admiral

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USA
687 Posts
Response Posted - 06/23/2003 :  18:49:20  Show Profile
Need to turn your guests into crew and get them tweaking the sheets and lines. They'll be much less bored having something to do. If you explain why you are having them tweak the particular sheet or line, they'll learn something about sailing in the process!

John Mason
<img src="http://www.users.qwest.net/~jamason/ali.jpg" border=0>
pronounced "Ali Paroosa"
1982 - FK/SR #3290
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osmepneo
Past Commodore

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USA
1420 Posts
Response Posted - 06/23/2003 :  19:54:37  Show Profile
<font face='Tahoma'>I remember years ago talking with dad about dn ice boats. They almost always have an apparent wind appraoching going to weather regardless of the point of sail. Any speed swings the apparent wind forward, and an ice boat generates alot of speed, so I hear, I've never tried one because it is cold and I don't like cold.

In your case a 5 knot (or mph) wind generating 2.5 to 3.5 boat speed in the boat would produce an apparent wind between 5.6 and 6.2, moving further forward as the boat speed increases. You had a greatobject lesson.

thanks for realizing it and sharing it with us.</font id='Tahoma'>

Don Peet
c25, 1665, osmepneo, sr/wk
The Great Sacandaga Lake, NY
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Dave B
Admiral

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Mali
863 Posts
Response Posted - 06/23/2003 :  23:41:56  Show Profile
In stronger winds, apparent won't shift so much on you because your boat speed won't be such a large proportion of the overall speed at which the air and the boat are meeting each other. In your light winds, the boat speed was a large part of that combination of boat and wind speed. That's why pointing and tacking in light air is even harder than it would intuitively seem to be, and that's one reason why cruisers use their auxilaries so much when it would seem they could just be sailing.

Dave Bristle, 1985 C-25 #5032 "Passage" SR/FK/Dinette/Honda in SW CT
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JimB517
Past Commodore

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USA
3285 Posts
Response Posted - 06/24/2003 :  12:59:44  Show Profile  Visit JimB517's Homepage
I suppose those big cruising catamarans that can sail at 20 knots across oceans are nearly always on a close reach as well (I'm thinking of the Gunboat 62 which was on the cover of Crusing World several months back). If you had such a boat, and this was true, obviously the boat should be optimized for upwind sailing.

<img src="http://www.indiscipline.org/cat25/pictures/icon.jpg" border=0>Indiscipline 1978 FK #398
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Arlyn Stewart
Master Marine Consultant

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USA
2980 Posts
Response Posted - 06/24/2003 :  13:40:38  Show Profile  Visit Arlyn Stewart's Homepage
This all becomes very apparent (pun intended) when on a catamaran when boogying along really well… and the bows submarine and stop the boat in her tracks. She will just sit there waiting for the sheets to be eased.

Arlyn C-250 W/B #224
<img src="http://www.stewartfam.net/arlyn/rr.jpg" border=0>
N/E Texas and Great Lakes

[url="http://www.cox-internet.com/arlynstewart/"]Arlyn's C250 Mods n Cruisin Stories[/url]
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
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