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undercamber VS. flat bottom (airfoils not fannies)

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radioinred

Well-Known Member
Joined
Apr 13, 2009
Messages
91
Location
Rapid City, SD, USA
Hi all, Im the kid who is designing the UL bipe with the little 250 snowmobile engine. I am currently looking for the best airfoil for my wings. Things I know: 1) I want to cruise at or around 55mph 2) MTOW is 600lbs 3) horsepower is about 27 with redrive and powerfin.

I have been going back and forth between an undercambered or flat bottom airfoil like clark y. Will the undercamber create too much drag or is the stability more important at this slower airspeed?

Here are some quick drawings.....
 

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