> >the optimum sailing angle can not be determined from a simple vector
> >analysis, i.e a decomposition of the net-force-vector.
This is a correct statement as there are a myriad of variables.
> But vector analysis ---snip--- use some help...
You can get pretty close to it using vector analysis as there will be a
point in the polar VMG diagram where the available driving force due to
the velocity squared (apparant wind) function is balanced by the course
dependent forward component of the lift vector. However, you will have
to know or make some assumptions regarding lift/drag coefficients,
sheeting angles, wind speeds, drag from the board and fin, degree of
side 'slip, degree of 'perfectness' of air as a fluid, water surface,
AND, the biggest variable will be the response of the board as a
function of driving force, as the faster you go the more the apparant
wind moves forward.
This is all a good rainy day exercise and perhaps an interesting
Master's Thesis, but a lot more fun on the water. Just get on a solid
close reach and start bearing off. It will become obvious within a few
seconds for your particular set of variables and best of all, porter
beer belliedness is automatically included...
I believe Sailquik has done this with his GPS (for his set of
- Bill Hansen