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  1. 3D2

    Undercamber Lift and Stall Speed

    Like Robertson cuffs on a Cessna Skywagon. But with the Part 103 weight restrictions, and the fact that I have two published and flight tested designs to choose from, and the fact that as stated it isn't a thin wing to begin with...
  2. 3D2

    Undercamber Lift and Stall Speed

    This won't be a thin wing, just a "less thick" one. The flat bottomed wing has it's maximum thickness of about 6.5 inches at 9 to 16 inches in its 48 inch chord. The undercamber reaches a maximum of 0.75 inch at about 21 or 22 inches. (The top of each airfoil is identical.)
  3. 3D2

    Undercamber Lift and Stall Speed

    Yes it is... Thank you for the graphs. (I love graphs.) At Part 103 speed, high speed drag isn't really a concern but bottom end performance is. Thanks
  4. 3D2

    Undercamber Lift and Stall Speed

    True, but at Part 103's weight limit structural strength is already limited. I won't be doing aerobatics in it. The published plans I am using show an undercamber of about 0.75 inch at 45% or so of its 48 inch chord as an option. The flat bottom option has a maximum thickness of about 6.5...
  5. 3D2

    Undercamber Lift and Stall Speed

    Yes or no, IIRC: "all things being equal" on airfoils with an identical upper surface, the one with an undercamber will produce more lift than the one with a flat bottom and as a result in level flight will stall at a lower speed. Thanks (Published plans offer both options.)
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