How to calculate CG on a Bipe

[Scrapbuilder]

Hi I need help i'm stuck i cant for the world figure out this how to get the cg on an biplane, I now how to find it on each wing but then...is it in the middle of those two?? but i dont think it's that easy:) or is it?

[Scrapbuilder]

btw i know there is no absolute cg but i need that point to sleep:) else i lie awake all night;)

[BobFlyer]

HTTP://FENNIS-FLYERS.TRIPOD.COM/ID74HTM

First figure your average cord per the diagram.
Then use aproximately 30% of average for the C.G. it can be from 20-30% depending on plane. Measure back from the leading wing edge.

BobFlyer

[Scrapbuilder]

That link seems dead:( The plane in question is a TigerMoth and have the upper wing 30% infront of the lower wing...should i calculate the cg on the upper wing witch is the leading wing and use that? because i know were the cg is on each wing but then what......see my dilemma:)(or stupidity)

[DanSavage]

Originally posted by Scrapbuilder
see my dilemma:)(or stupidity)

The easiest way is to calculate the CG for both wings as if they were one, single wing as seen from a top view of the model.

Dan

[Scrapbuilder]

AAhhhh now i get it:) thnx a milj. Dan