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Using Design Foil - a question

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rtfm

Well-Known Member
Joined
Jan 3, 2008
Messages
3,900
Location
Brisbane, Australia
HI,
I have a copy of Design Foil, and am learning how to use it. However, I am having some difficulty. Can anyone help with a abasic question?

Question:
Inputting the data from a known plane (in this case, the Corby Starlet) doesn't even vaguely give me the stall or cruise speeds listed for the plane. True, the Corby uses an airfoil which isn't listed in Design Foil, but airfoils aren't *that* different in performance are they? I've substituted the NACA747A315 (because I have the co-ords). For the given span, wing area and AoA as listed on the Corby site, my stall figure is way off, and at 130mph, I get a lift force of 928lbs - way too much for S&L flight, and a stall of 47mph, much higher than that listed for the plane - however, the use of flaps might account for the difference.

Regards,
Duncan
 
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