Bug, thought you were refering to the ring rotor - this is likely the overall winner. Is that sketch a upwards wing tip?
Nick, think i understand the anhedral tips now - CFD visualisation helps though. The downwash pushes the vortex outwards spanwise. This affects the inflow, so that the wake contraction occurs more above the blade than at the blade. The way i understand wing tips is you take a long wing, snap the end off and stick it back on at 90 degrees, so it's lift doesn't cause bending moment.
Dave, this would work but bear in mind control actuation lag. Worse case is twist in the tip spar delays accelerometer correction by 180 degrees. Tip piezo actuation may be the solution.
Shawn, how effective would a Wheeler-type vortex generator be at reducing blade spanwise flow? I'm thinking about the continuous change in airspeed.
Mart
Last edited by Graviman; 5th February 2007 at 01:48.