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Apr 06, 2017, 10:49 AM
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Rules of Thumb for Profile Funfly Designs

Morning all.

After many years absence, I am getting back into the obsession. Although I once flew IMAC (rather badly), the most fun I had was with funfly aircraft.

I am trying to derive the general rules of thumb for the design of such beasts. For example (for non-tapered wings):
Chord to wingspan: 25%
Aileron to chord: 33%
Horizontal Stab to wingspan: 25%
Fuz length to wingspan: 80 to 110%
Airfoil: symmetric around 15%, e.g. Selig 1048

These are based on old (and faulty memory) and a survey of what is available on the market today.

What would you add or change to these rules of thumb?

Thanks for your advice,

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Apr 06, 2017, 10:22 PM
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kerwin50's Avatar
Light wing loading. Weight is everything.
I also like a 0-0-0 along The datum line
Apr 06, 2017, 11:02 PM
Pylonracr's Avatar
Agreed, wing loading of less than 15 ounces. Short coupled for ease of tumbling. 45 degrees of control surface travel. I fly a MOJO, a google search will get you many photos. This is one of the planes considered state of the art in 3D profile planes, since Swanny no longer sells them use the design as a basis for your own design.
Apr 27, 2017, 10:31 AM
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Newbie1980's Avatar


Last edited by Newbie1980; Apr 27, 2017 at 10:41 AM.

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