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Tuning Guide and Polars
Posted: Tue Apr 08, 2008 10:17 pm
by Captain Frank
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
Posted: Fri Apr 11, 2008 11:02 am
by Spike Boston
Send us your email address and we will get you a tuning guide right away.
Spike Boston
Posted: Fri Apr 11, 2008 11:36 am
by Tom Elsen
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.
Had 'em here in Chicago
Posted: Fri Apr 11, 2008 11:10 pm
by Tom Elsen
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
Posted: Sun Apr 13, 2008 8:14 pm
by Tim Bosma
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,
Posted: Sun Apr 13, 2008 10:54 pm
by Tom Elsen
Hey Tim
Do yours differ significantly from these? Just wondering.
Posted: Mon Apr 14, 2008 12:01 pm
by Tim Bosma
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.