Still warm and fresh off the printer. This is an experiment with the effects of fillet on a 22cm, 8% foil, 50 degree rake.The fillet is shaped fore-aft, with the peak height of the fillet at the guesstimated peak interference wave pressure. (The interference wave resulting from the base of the board pressure wave interacting with the fin profile wave.)The thought is to: - reduce the severity of the interference between the two waves and reduce turbulence and opportunities to ventilate the fin surface from the leading edge.
- increase the surface energy of the water to increase the effectiveness of that water layer as a barrier to ventilation on the leading edge.- confine the separation bubble to the trailing edge.
Given there is increased 'action' on the flow I expect there will be an increased drag component. There might also be some vertical lift as the water impacts the fillet mid-chord bulge. Or, given the immediate lower pressure region following because of the rapid retraction of the fillet volume, there might be an overall suction effect... Hence the experiment, since I don't really have a clue which forces are going to win out in a turbulent flow of air and water. And possibly the dominant forces will change with velocity and water state.
Printed in PLA at 0.2mm layer thickness. I will do the usual surface and fill with epoxy resin, with stiffening rods internally. 
Very neat Fangy, would you like me to test it for you?
While you are blouse shopping
Select to expand quotedecrepit said..
Very neat Fangy, would you like me to test it for you?
While you are blouse shopping
Oh Ouch!
Luckily the quality of the Big Girl's Blouses I have scored on these cold wet windy days have been worth the pain.
Turns out Doris is also known as the "The Great White nudibranch (Sea Slug)". Harsh, but may turn out to be true.
I think it could only be a good thing. Very interested how it goes. It could be a fix by bogging up those horrible Deltas. Thinking lipstick on a pig.
