Airfoil 450 gross, 100 sq ft. , 14%, USA35B, Clark, or Rag Wing?

[peter hudson]

At 27.6 MPH (sea level on std atmosphere) dynamic pressure is 1.95 lb/ft2 so you would need a CL of 2.3 which is a pretty big number!

 

[Protech Racing]

28-29 should be doable.

 

[peter hudson]

103 calcs for stall speed allow you use a CLmax of 2.0 if you have 50%+ flaps. At 450 lbs and a CL = 2.0 you need 115 ft2 of wing. You're not FAR off, but with a CL of 2.0 and only 100 ft^2 your stall is at just under 30 mph. One thing to consider though, is the stall speed in part 103 is for a 170 lb pilot not for gross weight with fat pilots and safety chutes.