To all who have or are considering getting the Hangar 9 SU-31 Sukhoi:

After receiving several calls saying the model comes out tail heavy, I
rechecked the CG and found that the location indicated in our manual is
incorrect. The correct cg location is 13/16" behind the CENTER of the wing
tube for precision flying, and approximately 1/2" to 3/4" behind that for
all 3D flying.
Balancing at these locations will make the model balance much easier and
should not require any nose weigh unless a very lightweight engine is used.
Balancing any farther forward than the above mentioned CG locations will
result in an is excessively nose heavy model.

Sorry for the confusion on this.

Thank you for the updated CG. Just starting on mine.