Wiki Sail by GRF

By the time the wind is so light as to be drifting, the skills of the sailor in that kind of weather, and the ability to concentrate when all about you are dreaming of beer, is far more important than whether you have a Supernova or a Laser under you.

Originally posted by Rupert So, If I'm doing all this with a pencil and paper and cardboard models, what sort of info do you think people with CAD programmes are able to get?

Stuff like this..

Draft Amidsh. m     0.084
Displacement kg     155
Heel degrees     0°
Draft at FP m     0.084
Draft at AP m     0.084
Draft at LCF m     0.082
Trim m     0
WL Length m     4.125
WL Beam m     1.9
Wetted Area m^2     4.534
Waterpl. Area m^2     4.421
Prismatic Coeff.     0.481
Block Coeff.     0.346
Midship Area Coeff.     0.812
Waterpl. Area Coeff.     0.778
LCB to Amidsh. m     0.130 Aft
LCF to Amidsh. m     0.122 Fwd
KB m     0.063
KG m     0
BMt m     8.95
BML m     25.081
GMt m     9.013
GML m     25.144
KMt m     9.013
KML m     25.144
TPc Tonne/cm     0.045
MTc Tonne.m     1.#IO

Dude you sail an RS100 on a puddle, what more can I say?

Edited by iGRF - 27 Mar 13 at 10:44am

The light air thing, does always pre suppose that, that volume/displacement is contained and in a light wind efficient 'curve and rocker' shape. Flat surfaces drag, everyone knows that, but flat surface a) with 300 litres will be faster than the same flat surface b)with 200 litres in light air on inland water.

So it would follow, if you took a Laser Hull, cut it in half laterally along the gunwale, inserted a couple of inches, then reattached the deck and upper gunwale, would you have a faster boat in lighter air which would support heavier sailors, and would it be less susceptible to performance difference in sea water over fresh, that crudely explains my point. Would it be more efficient than say that Supernova or a Firefly type hull in light weather? Probably not, would it be faster than another Laser with an identically skilled sailor of the same weight, I say yes it would, up until the point when the sail needs to be depowered.

That is the bones of my argument re whatever you want to call it, volume, buoyancy or displacement.

Now I need to do some work for a bit, flame a way...

Edited by iGRF - 27 Mar 13 at 11:06am

Originally posted by iGRF So it would follow, if you took a Laser Hull, cut it in half laterally along the gunwale, inserted a couple of inches, then reattached the deck and upper gunwale, would you have a faster boat in lighter air which would support heavier sailors, and would it be less susceptible to performance difference in sea water over fresh, that crudely explains my point. Would it be more efficient than say that Supernova or a Firefly type hull in light weather? Probably not, would it be faster than another Laser with an identically skilled sailor of the same weight, I say yes it would, up until the point when the sail needs to be depowered.