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  1. M

    Electric Powered Fixed Wing U/L

    One point that no-one seems to have raised ; electric power is not altitude limited ;ie for pistons or turbines, the higher you get, the more the power degrades.Not so for electric motors! That could be a real advantage in some areas.
  2. M

    Airfoil for an ultralight sailplane?

    Regarding your mention of "flat" sections top and bottom aft of spar ; if these are fabric covered in flight they will be no longer "flat".Unless the tension in the covering material is incredibly high, the top side sections will "balloon" up, ie gently bulge, and the bottom sides will become...
  3. M

    Say it isn't so.

    Given that 9-11 involved Civilian aircraft, a real knee-jerk response.
  4. M

    Facet Opel

    If the bi-convex section has a radiused leading edge, then the maximum thickness will be AHEAD of the 50% chord position.
  5. M

    Facet Opel

    The "additional pitch control" surface was also used on the "Zimmer Skimmer" and the later variant, the XFSU-1, pic attached, as well as other aircraft.
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