I purchased a Cmp P-40 .50 size warbird, and to get it to balance at the recommended C.G., I had to add 1.25 lbs. to the nose, with a .46 AX engine. The total weight for this plane came out at 7.25 lbs.- Keep in mind that this is only a .50 size plane! The plane violently spun into the ground and was completely destroyed on the first flight after a shallow turn (going full power) about 30 seconds into the flight. Considering that the plane was set up 100% according to the manual, and was traveling as fast as it could when it stalled and spun, it seems like there are some inherent design issues/ c.g. issues with this airplane. Has anyone else had similar problems with the cmp .50-size P-40?