wind and hull speed

Hello The Flying Sot NEVER planes upwind.Irrespective of how fast the boat goes upwind, the hull shape when heeled over will not plane. Generally hull speed can be 1.3 x sqrt of waterline length which gives about 5.7 knots for the flying scot . Planing will start shortly after. People have argued about the term planing and it's meaning for years. A strict definition is that the center of gravity at speed has to rise above the at rest center of gravity location. Others say it planes when the flow from the transom exits smoothly and leaves the transom dry. ( Of course on the Scot this can happen at low speed by shifting crew weight forward). Still others say that the boat planes when the bow rises sufficiently to decrease the wetted surface significantly to improove the speed

Frank, Take a look at the Performance Prediction polars for the Scot. You can see the range of wind speeds and angles that can get the boat up to hull speed. As Karafiath states, the Scot is never going to plance to windward and is limited to the hull speed of around 5.7 kts. That being said, the polars show the predicted hull speed in excess of that in a number of cases. Not knowiing how the prediction model was made, I would tend to discount these numbers, but the ones at the lower wind ranges going to hull speed are probably okay. Jim Davis FS 784

Randy, The polars were posted on-line in the past, but I can't find the site. Send me a pm and I send you a pdf copy of what I have. The numbers are theoretical estimates to give you a baseline reference--so don't take them too seriously. Jim

thanks, i got the polars from a local fleet member, not sure i'm sophisticated enuff to benefit from them yet but am holding for future reference. rb