BWD wrote:Intuitively my take is accelerated flow from over top of the front wing approximately matches the velocity across the top (high pressure side in this design) of the stab in a useful velocity range, reducing stab lift and drag in that range..... Naturally as an unschooled Neanderthal in the area I may be overlooking a few details...
But variations in fuse length over the last while of developing current racing foils may support this idea, or not, what do I know?
except for the 1st and 3rd plots (3 & 8 m/s) which have comparatively high peak velocities in the rear fin (high negative lift values and velocities higher than the suction side of the front wing)
thus suggesting that pitch control could be on/off/on as a function of velocity while pitch angle is held constant.
at the moment, it hard to come up with a story I believe.