Tuning Guide and Polars

Captain Frank · Post by **Captain Frank** » Tue Apr 08, 2008 10:17 pm

glad to be here, I will have many questions in the future.

First How do I obtain the: Rig Tuning Guide and

The Polar charts

I would appreciate any help

Thanks

Spike Boston · Post by **Spike Boston** » Fri Apr 11, 2008 11:02 am

Send us your email address and we will get you a tuning guide right away.
Spike Boston

Post by **Tom Elsen** » Fri Apr 11, 2008 11:36 am

Welcome to a great class. Where are you sailing?
I've got polars somewhere, but they're back in Minneapolis.
Will try to post them next week.

Post by **Tom Elsen** » Fri Apr 11, 2008 11:10 pm

Polars

Upwind
TWS__AWA__TBS___BTW
_6_____28___4.2____48
_8_____28___5.0____46
_10____29___5.5____46
_12____30___5.6____45
_14____31___5.6____45
_16____32___5.7____45
_20____34___5.8____45

Downwind
TWS___AWA*__TBS__BTW
_6_____80____4.1___39
_8_____66____4.9___33
_10____33____5.1___17
_12____22____5.7___12
_14____11____6.1____6
_16_____8____6.5____5
_20_____7____7.1____5

TWS= True Windspeed
AWA= Apparent Wind Angle *= from transom
TBS= Target Boat Speed
BTW= Course from True Wind angle

Note: These are from a old IMS spec sheet. My own experience is that more modern sail designs allow you to cut a bit closer to the wind (going up) and a little deeper on the runs. That is especially true in the 9 - 11 kts TWS range

Post by **Tim Bosma** » Sun Apr 13, 2008 8:14 pm

Capt'n Frank,
I have a set of target speeds for the 7.9 developed using the PCSail vpp from Univ of Mich. PM or e-mail me and i will forward you a set.
Thanks,

Post by **Tom Elsen** » Sun Apr 13, 2008 10:54 pm

Hey Tim

Do yours differ significantly from these? Just wondering.

Post by **Tim Bosma** » Mon Apr 14, 2008 12:01 pm

Tom Elsen wrote:Hey Tim

Do yours differ significantly from these? Just wondering.

Mine are slower by about .1 to .25 knots, but I run it up to 38 true wind angle.

S2 7.9 Meter Class Association

Tuning Guide and Polars

Tuning Guide and Polars

Had 'em here in Chicago