kevmatthews

Is there a formula for determining the CG on a scrath built unique craft of your own design?

Kevin

Tall Paul

Probably.

Flypaper 2

Make a small 9 or 12 in. balsa model of the same planform. Put a little uptrim in it and balance to get a fast, flat glide. The CG point will be the same for the big one.

Joe Ortiz

My Feedback: (75)

I would like to know the answer as well, so Tall Paul, are you just out to up your post count[sm=confused.gif][sm=lol.gif]

feihu-RCU

Yes there is a formula around, but Kevin didn't ask what it is!
Tell em, Paul

feihu

Joe Ortiz

My Feedback: (75)

I had some kind of CG Calculator, It had something to do with wing cord, span, type of wing and weight, anyway, I believe Kevin did ask the right question

Joe[8D]

Tall Paul

.
Without any knowledge of what this configuration could be, there is probably a set of equations which can compute the c.g.
Flypaper's methog works more quickly, than fingering out which parts are wing, fuselage and tail, if the shape is a wierdo.
If the shape reesmbles something already flying, and most do, then what works for the analog will work for this one.
And, the chuck glider is still simpler.
To get into neutral points, static margins, tail volume coefficients, then a LOT more information than "unique" will be needed.

kevmatthews

To anwser my own question for those who also wanted to know go to :

http://www.geistware.com/rcmodeling/model_calc.htm