Just one screw on the CG is fine... top or bottom doesn't matter...

I have an O.S. 46fx and the engine is all the way back as I can get it...

I used a 1650 mah pack in the trailing edge of the wing OPPOSITE of the engine-head-side...

In addition, my fuel tank, receiver and switch is on that side too...

Basically you'll NEVER have perfect lateral balance for any amount of time due to the fuel tank having to be left or right of the lateral balance point...

However, with the tank on the opposite side, you'll offset more of the weight with simply the weight of the tank, clunk and lines AND when fuels in, you'll be left heavy for part of the flight and perhaps right heavy the second half...

For CG... the kit is already 1 lb lighter than the ARFS so adding some tailweight wont hurt too much... also going with the carbon fiber gear might help a tad... (get info on gear here:Profile Brotherhood

ALso let me say that the plane is a real performer despite the lateral balance issues... The plane with fly great a bit noseheavy and you can add tailweight to your liking... With a Saito 72, you won't be hurting for power.


Lastly if I build another, I will weigh the sheeting and put the heavier sheets on the "light" side...

I'm strongly consdeiring building a 150% scale version with sheeted foam wings and fuse... I'll also make the wings removable via wingtube. I will leave the nose longer than the plan and test the CG with the servos in the tail.... I'll then adjust the length of the nose to achieve balance.