wind and hull speed

does anyone know at what approximate wind speed going upwind versus abeam does the Scot reach hull speed beyond which the boat cannot go unless it planes? Frank

Comments

Hello The Flying Sot NEVER planes upwind.

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

karafiath: thanks.

karafiath: thanks... but I was wondering what the wind speed has to be in order to get to maximum hull speed...and if that was very different for upwind versus abeam? do you have any information on that? thanks!! Frank

Frank, Take a look at the Performance Prediction polars for t

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

jim, is there a set of performance prediction polars specific to

jim, is there a set of performance prediction polars specific to the 'scot? where could i find them? thanks! randy blough FS1954 rb

randy blough, FS1954

Randy, The polars were posted on-line in the past, but I can'

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

I think they were posted on the "Unofficial Scot site" I think t

I think they were posted on the "Unofficial Scot site" I think the class webmaster is looking into bringing that content to the FSSA site. Phil Scheetz FS 4086

Phil Scheetz

FS 4086

Fleet 163, Nockamixon Sail Club

thanks, i got the polars from a local fleet member, not sure i'm

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

randy blough, FS1954

Phil Sheetz refers to my resurecting Fields Gunsett's Unofficial

Phil Sheetz refers to my resurecting Fields Gunsett's Unofficial site. I do have all the contents, but it's going to take me a while to redo it for the official FSSA site. However, the polars are contained in a portable document form (pdf) and here they are. Happy calculating, Hank Hank Sykes FSSA Forum editor