I HAVE A B BINGO I AM INSTALIING A 54CC TORO CHAIN SAW ENGINE WITH C/H ELETRONIC IGN. I HAVE FOUND A SET OF PLANS IN THE AMA ARCHIVES OF MAGAZINES BUT THE C/G IS NOT CLEAR. ANY INPUT WOULD BE APPRECIATED

THANKS
JACKIE

Bingo -- low wing member of the Ace/Doc Mathews 4-40 family, yes?

They've all got the same straight rectangular wing, so you can simply use the CG rule of thumb: CG belongs between 1/4 and 1/3 of the chord length back from the leading edge. For a plane I'm not yet familiar with, I always start at 28% and adjust from there.

There is an easy, general process for figuring out balance point on any wing... you have to find the mean aerodynamic chord... and then set the CG the standard 25-33% back from the LE at the mean chord. Not hard to do, but I won't belabor the details unless somebody need them...

I have a kit still in the box.

The instructions say center of the main spar.

Enjoy!

BobbyG

THANKS FOR THE HELP. I'VE SEEN THOSE CALULATIONS BEFORE.

JACKIE

THANKS BOBBYG WERE DID YOU FIND AN OLD BINGO KIT. SOME ONE STATED ACE WAS BOUGHT OUT BY TUNDER TIGER. ARE THEY STILL MAKEING THE BB KITS?

APRECIATE THE HELP

JACIE BABINEAUX
LAFAYETTE, LA

JB, I was able to hunt one down on the web. I had a beautiful one that went in with elevator flutter ... really pained me!

I decided I needed another and went looking. I found it looking here through RCU.

Also found the 40 and 60 sizes by sheer luck. One of these days at about this time I'll get them built.

Enjoy!

BobbyG