gbleck wrote: I'd say no cutouts and a flat bottom nose to a wide diamond tail.
bradn wrote: I will remove the cutouts, don't need them unless going >30 knots anyway
Just curious what is the basis for these suggestions?
If you want to do an open source design, we'd need to indicate not just what but WHY we are making these suggestions. Otherwise this will be little more than a drafting project.
Some points of reference should be (not necessarily limited to)
a) other successful designs,
Example (information false): Every raceboard that has podiumed this year has a diamond tail. flat tailed boards appear uncompetitive (show race results)
It's hard to argue with FAST. So even if it does NOTHING it's obviously not hurting performance much so if all fast boards are waxed with snake oil, I am happy to accept the opensource board will get snake oil until it is proven that mouse milk is way faster. .
b) accepted planing/hydrodynamic theory (Information false)
Example: Based on the size of the cut outs, the angle of trim required to have the cut outs effectively out of the water would be less than 2 degrees. In order to create board lift of 180lb at this trim angle would require a velocity of 30 knots and would create a reduction in wetted surface area of xx% and an expected drag reduction of yy Assuming an original wetted surface area of ww ft^2, (attach references)
c) Objective Test results
Example (information FALSE...just getting the idea across. )
I've ridden two boards one with a diamond tail and one with a flat tail, Using my GPS and windspeed data from ikitesurf, I was consistently able to point xx degrees higher into the wind on the diamond tailed board and maintain higher velocities at lower angles of point. (attach data and conditions)
d) Subjective test results:
Example (information FALSE): If I use a fins greater than 45 cm I get flipped over the front of the board as soon as the board starts getting any speed. So at 50 cm, I'm concerned this design will have too much fin.