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Viper 640 Class Association Forums

Viper 640 Public Forums => Viper Discussions => Topic started by: Charlie Visser on September 14, 2010, 04:53:43 PM

Title: Beam reach Viper targets?
Post by: Charlie Visser on September 14, 2010, 04:53:43 PM
Trying to roughly approximate the complete Viper polar. I have the upwind and downwind targets from North, but I'm looking for some boat speed numbers (however rough) for two-sail beam reaching. Can anyone help?
Charlie
Title: Re: Beam reach Viper targets?
Post by: Tim Carter on September 14, 2010, 05:20:53 PM
How hard is it blowing???

We were doing 14-16 under white sails in San Fran a couple of weeks ago....  BUT....  it was blowing the urchins off the rocks.....  ;)
Title: Re: Beam reach Viper targets?
Post by: Charlie Visser on September 14, 2010, 10:05:18 PM
So it was blowing 20 kts? 25 kts? More? (My urchin calibration is rusty.)
Title: Re: Beam reach Viper targets?
Post by: Tim Carter on September 15, 2010, 12:13:20 AM
Goverment said gusts into mid to high 30's.  Beam reaching @ 90 deg apparent was a bit violent..  =:0
Title: Re: Beam reach Viper targets?
Post by: Charlie Visser on September 15, 2010, 04:52:13 PM
90 AWA would mean about 120 TWA at 15 knots boat speed and 30 kts TWS.
Title: Re: Beam reach Viper targets?
Post by: Tim Carter on September 15, 2010, 04:59:42 PM
All I know is that I had to sail across a butt load of breeze to get back where we launched...you could not "trim" the sails without having about 300# more on the rail otherwise the boat would just be slapped down.  Too busy trying to pay attention to look @ the GPS....  found out later it drowned..
Title: Re: Beam reach Viper targets?
Post by: Tim Carter on September 15, 2010, 08:09:19 PM
Charlie, you still coming out to sail with me in a couple of weeks???
Title: Re: Beam reach Viper targets?
Post by: Charlie Visser on September 16, 2010, 08:31:44 AM
Definitely, Tim. I will send you an email. Can't wait!
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