Thunder Tiger J3 Cub balance point ?  
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All Forums >> RC Airplanes >> Aerodynamics >> Thunder Tiger J3 Cub balance point ?
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Thunder Tiger J3 Cub balance point ? - 7/9/2003 6:41:13 AM   
mar345


 

Posts: 176
Joined: 10/10/2002
From: Doylestown, PA, USA
Status: offline 		I have a Thunder Tiger J3 Cub ready for first flight. It balances at 33% of the mean cord back from the leading edge or 3.75 inches.
The instructions call for 4 to 4.5 inches or 35% to 40% of the mean cord. The wing is flat bottomed. Looks like a Clark Y. Span is 82 inches. Cord is 11.25 inches. Length is 48 inches.
Any thoughts on where a Cub should balance ? 40% seems a bit much. Any thoughts?
       Post #: 1

Thunder Tiger J3 Cub balance point ? - 7/9/2003 9:10:25 PM   
Wizardofflight


 

Posts: 20
Joined: 11/19/2002
From: Covington, WA,
Status: offline 		This is a bit of shameless self promotion, but if you have access to Excel give my spread sheet a try.

http://www.angelfire.com/scifi2/wizardofflight/images/RC_Aircraft_Design.zip

I'd be interested in the results.

Alan

(in reply to mar345)
       Post #: 2

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