Re-read post 44. The writer indicates that even with a YS110, his is still tail heavy and so are about 8 others at his field set up the same way.

To get this plane to balance so that it will fly at all, it is my belief that it would need to be balanced at around 85mm from leading edge rather than the 95-110 that the manual suggests. At 85mm a significant amount of weight will be needed with most engines including the YS 63 that you are planning to use. My second plane is set up with a TT .91 (about 26 ozs.) and it still needs about a pound of lead in the nose to balance at 85mm. This brings the plane to over 8lbs. for a .40 size plane. My only guess is that it will fly like a brick with the higher weight and wing loading.

I have 2 of these planes. The first crashed twice for this reason and I have yet to fly the second. It is ready to go and it will be flown in the spring.