Semi-sym / Fully-Sym Airfoil - Please help clarify...  
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All Forums >> RC Airplanes >> Profile and Fun Flying Planes >> Semi-sym / Fully-Sym Airfoil - Please help clarify...
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Semi-sym / Fully-Sym Airfoil - Please help clarify... - 10/16/2003 1:52:01 AM   
_shadow_



Posts: 461
Joined: 8/27/2002
From: Shah Alam, MALAYSIA
Status: offline 		Guys,

Please help me out here, funflys like these, e.g. Magic 3D, Limbo Dancer, Cougar 2000, Heckler, Jerry's Big Boy, all have semi-sym airfoils...Why ? Arent fully symmetrical airfoil better at aerobatics?

The only exception to the above is the new Fun Air...anyone flown this and one of the above planes to notice any difference?

I am beginning to think that I should change my idea of using a fully sym. airfoil for my scratch built funfly.

Thanks.

Regards
Marcus

< Message edited by mchandrasegran -- 10/16/2003 1:55:18 AM >
       Post #: 1

RE: Semi-sym / Fully-Sym Airfoil - Please help clarify... - 10/16/2003 2:21:53 AM   
Ed_Moorman



Posts: 3708
Joined: 1/5/2002
From: Shalimar, FL, USA
Status: offline 		This is my opinion about the use of semi-symmetrical airfoils on those planes.

The first 3 planes anyway are British in design. The Brits used to use different competition fun fly maneuvers from us in that they used to include a climb, shut down and glide or something that required a low drag airplane to be competative. The very thick, symmetrical sections we prefer here were too high drag to glide very long.

Fast forward to 3D and we have planes that hardly need an airfoil. Witness the PBF, a flat piece of Coroplast, and the SPA3D, which has a folded Coroplast wing. Both 3D well and their airfoils aren't worth talking about. The same can be said for some ot the electric 3D foamies.

With less lift and easier stalling in the downward direction, these planes ought to do forward flips, waterfalls, pretty well.

Think about your flying, how many outside maneuvers do you do? An NACA 2415 semi-symmetrical airfoil (15% thick) is a really good airfoil for everything, including outsides unless you are trying to do really tight maneuvers. For a faster plane try the 2412.

_____________________________

Ed Moorman, AMA 553, KD4QBM, Revver Bro #156
R/C Report Magazine, Fun Aerobatics Column

(in reply to _shadow_)
       Post #: 2

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