I have a Venus 40 with an OS46AX. With a 1500 mAhr NiMh battery forward under the fuel tank
and the receiver in front of the servos the plane balanced just forward of 4-5/8" (about 4-3/8")
per the manual. The plane was built per the plans and with the included hardware and came in at 5.6 pounds. I think I have the engine slightly forward from the instructions as the gap to the between the spinner and the cowell is about 3/16" of an inch. This may have helped, but even so it's very curious why some come out so tail heavy, and others balance fine.


I really like this plane. To bad they don't also make a 60 size of about 61" wing span as I have a 20 year old OSMAX 61 FSR ABC that needs a good home.