The UCD is a very fun plane to fly!!! I leaned out the saito 72 rpms around 9150-9200, the engine has more than enough power. The only problem that I had was flight time 6 mins per tank, I ran out of gas in the middle of the flight and the plane just floated in for a nice landing. Anyone else have such short flight times???

painly,
My saito 72 vibrates the **** out of the plane too, I had to use locktight on the engine mounting screws.

Maxim_jd,
I put my battery under the gas tank and have a cg of 4 3/4 and it is nose heavy. I am going to take the battery out from under the tank and move it back. Since you are using the 46fx you might need to put the battery under the tank to stay within the 4''-6'' cg range the GP recommends. My coving was saggy too.

scynor