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PostPosted: Mon Apr 26, 2004 7:05 pm 
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Site Rank - Deck Hand

Joined: Mon Jun 30, 2003 11:53 am
Posts: 9
Location: San Francisco, CA
I am a new Tiger owner, previously owned both a 16 and FXOne, and would like to work through this forum to explore setup recommendation on the subject of upwind performance.

I seem to be pointing about the same as my local Tiger fleet but surprised to see the upwind tacking angles during solo detailed measurements(using a digital compass system with GPS) are around 50-55 degrees to true wind (8-10 knots true wind). Unfortunately, I have yet to find a local Tiger to tune against, so this forum will have to do for now.

Speed is good and all the setting initially follow Greg Thomas' expert advice. Yet, the result (while seemingly competitive) is below my expectation that in moderate wind we should be able to be in the 45 degree range.

I have made many trim adjustments in very steady conditions with flat water and the results have changed speed quite a bit but little improvement in upwind angles.

With the modern design of this sail plan and the high aspect boards, why aren't Tigers outpointing most monohulls.


Appreciate any comments. Many thanks.


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 Post subject: Apparent wind is the key
PostPosted: Mon Apr 26, 2004 11:51 pm 
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Site Rank - Old Salt

Joined: Thu Nov 13, 2003 10:00 am
Posts: 383
Location: Long Beach, CA
Phillip:

Outpointing most monohulls is a problem for a catamaran. The real culprit is the speed :shock: . The faster you go the more the apparent wind will come to the front of the boat. To get the sails working they have to see an angle to the wind. As that angle gets too far forward you will have to turn the boat a bit off wind to keep the same wind angle to the sail. The faster you go the more you will be effected by apparent wind...This is a good thing!

Try driving a Trifoiler at 40 MPH while measuring tacking angles, they are bad, but the boat is really fast. Greg Ketterman proved that it can sail upwind as fast as a catamaran, I think it was a Prindle 19, sailed by some of the best. That is, getting to the weather mark not pointing with them. It seems like there is no downwind on a trifoiler as you will always keep the sail sheeted to center. Speed is the rush!

Dan :D


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 Post subject:
PostPosted: Tue Apr 27, 2004 8:56 am 
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Site Rank - Deck Hand

Joined: Mon Jun 30, 2003 11:53 am
Posts: 9
Location: San Francisco, CA
Dan,

I appreciate the speed consideration. Occasionally I sail with fast skiffs, 29ers, and they point higher with similar speeds. I also understand that many modern sport monohulls drive to weather with apparent wind at or near the true wind speed. They claim tacking angles below 45 degrees.

These boats are seeing the apparent wind move forward just as you describe. Evidently they are capable of very effecient apparent wind angles that result in this pointing ability.

To be a bit more specific. What are your measured tacking angles and at what speed? I would love to collect some data from our community.

Sunday I measured a 55 degree tacking angle in flat conditions, 4-5 knots of wind true while travelling at 6.5-7 knots up wind.

Thanks,

Phillip


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