I think Jehardiman identified the problem: The pivot axis is too far forward on the rudder. Any symmetric airfoil has the center of pressure...
Another thing that's not helping is the sweep, which makes the tip loading increase with AoA even faster. The combination of excessive taper and...
You should realize that there is always a threshold wind speed below which foiling will be slower than displacement sailing. The simple reason...
I was envisioning that the lifting rudder foils would give some roll stability because of free-surface effects. This effect, acting on the...
One really big change from AC-62 to the new AC-75 boats is that the latter have no passive roll stability when one of the main foils is retracted....
I skimmed through the video, and that didn't show a mast. You could put a rib at the bottom of each section, with each rib sliding up a fixed...
The main problem I see is that this is a horribly inefficient structure for carrying the bending moment imparted by the airload. The overall...
I'm not sure what you mean by "line up" here. Since INTE always interpolates to the s/smax values taken from airfoil 0, it can do the following...
INTE interpolates x(s),y(s) at the same fractional s/stot location on each airfoil side. INTX interpolates y(x) at the same x/c location on...
Prandtl worked on many things. The Prandtl Number and Prandtl wing theory are completely unrelated.
What's the reason for having the hounds below the tip? Aerodynamically it doesn't make sense, since it promotes local tip stalling as your calcs...
It's hard to make out from the drawings, but I see a "forward rudder" that isn't too far ahead of the CG, and additional rudders fairly far aft....
Pitch balance (or pitch trim) is always required, with or without active stabilization. A fore rudder makes the moving boat behave like a dart...
Here you need to distinguish between drag (defined along the relative wind), and resistance (defined along the path of travel). When a crosswind...
Hmm. The PDF shows the boat is in trim upwind and downwind, but nothing about stability. It definitely looks hydrodynamically unstable in both...
