I wrote this earlier "U may find you may need to fly with the wingtip aileron free floating to see what angle it orients itself before u connect it. Don't be surprised if it is pointing down quite a bit." Bob Hoey said this "Left, the lead feather is set at negative 27 degrees (this is not a typo), the second is at -19 degrees, the third at -15 degress and, the remaining stationary feathers are reduced 4-5 degrees per feather until the aft one is at zero. Other combintions of angles have not worked as well as this one." HoeyVulture He also said this "To test this theory I built a wingtip that had the 3 forward feathers mounted on a single spanwise axis. There was a change from adverse yaw to proverse yaw as the initial bias position of the ailerons was changed. The best bias position was with the forward feather at a whopping big -27 degrees of incidence relative to the chord of the rest of the wing. I built a model of this wing tip and ran it in the NASA DFRC water tunnel. These tests confirmed that the flow over the forward tip feather was smooth at -27 degrees, but would stall (on the bottom) at -35 degrees, and stall (on the top) at -22 degrees" BirdLetters does this answer your question?