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Jun 17, 2011, 09:57 AM
if you see a weed, pick it
malakiblunt's Avatar

were to hinge flaps on Clark Y ?

Hi im in the process of drawing up a 6ft span cessna Birddog, im looking for extream stol performance, to that end im building it very light,
I had originaly intended to use a Drela aerofoil as i realy like the way my supergee handles, but i know enough about to know i cant just increase the chord 13" and double the wing loading expect it to handle the same.

Anyways so ive gone back to basics and decided on the Clark Y (unless anyone ccan recomend something better?) , Its going to be a hotwired wing so i can get the foil acurate, my qeustion is were should i hinge the flaps for best performance?

kind regards
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Jun 17, 2011, 11:21 AM
HerkS's Avatar
This data should put you in the ball park
Jun 18, 2011, 02:08 AM
No Guts No Glory
kestrel2003's Avatar

what book is that table from

Hi, what book/Report is the table from? rgds mv
Jun 18, 2011, 02:47 AM
Grumpy old git.. Who me?
JetPlaneFlyer's Avatar
That table is really good.. the only caveat i would add is that it's based on quite high Re (609,000). The performance of flaps at the much lower Re of a medium size model during take off and landing could be very significantly different..
Jun 18, 2011, 08:16 AM
HerkS's Avatar
Originally Posted by kestrel2003
Hi, what book/Report is the table from? rgds mv
Airplane Performance, Stability and Control
Courtland D. Perkins, & Robert E. Hage

Most of those referenced NACA reports are probably still available
Jun 18, 2011, 11:35 AM
No Guts No Glory
kestrel2003's Avatar

great, many thanks

thanks, many regards mv

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