Biplane Balancing Questions - RCCanada - Canada Radio Controlled Hobby Forum
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Old 05-27-2007, 09:59 AM   #1
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Biplane Balancing Questions

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Hello to All !
I am currently gathering up my goodies on building WW1 biplanes
and have come to a stand still when it comes to locating the center
of gravity.

So is there anyone out there who can point me in the right
direction ?
Any biplane c/g ideas would be alot of help !

Cut it twice,and it's still too short !
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Old 05-27-2007, 10:36 AM   #2
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Best to ask in the combat section of the forums, there are several good builders there.

Look at some plans too...
desiderantes meliorem patriam
To err is human, to moo is bovine
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Old 05-27-2007, 01:22 PM   #3

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The CG will vary depending on the model you are building, the plans or instructions for your model, should give you that information.
If you don't have any instructions, then try this link, it may help.
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Old 05-27-2007, 02:33 PM   #4
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and remember: a balancer whether bought or home-made, only tells you where the cg is, not where it should be.
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Old 06-06-2007, 02:51 PM   #5
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On bipes with stagger, say the top wing is two ins. ahead of the bottom wing and the bottom wing is 6 in. chord, add the 2 ins. to the wing making 8 ins. The CG would be 30% of that # so the CG would be 2.4 in back from the leading edge of the top wing. Another way of looking at it is to draw a vertical line at the leading edge of the top wing down to your table. This is with the plane sitting up level of course. Now measure from the trailing edge of the bottom wing to that vertical line and that gives you a chordline. 30% of that line is where the CG will be. On wings with no stagger, the CG will be 30 % back from either wing.

Tried for my kamikazi pilots licence. Flunked the test.
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Old 06-07-2007, 03:26 PM   #6
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I built a coro SE5 for combat and followed the advice given by Flypaper The plane flew great. I had no idea and a fellow combat pilot advised me.
Good Advice................
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Old 11-20-2010, 01:02 AM   #7
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Re: Biplane Balancing Questions

just pancake the two wings together for an overall cord width and measure 30 percent of the total ,slighty sloping forward with emty tank of gas.hope this helps.
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