ORIGINAL: Rocketman_
Holy moly, AstroMan!! Your UCD 46 weighs only 5 1/4 pounds with fiberglass reinforcing? Thats a very light weight UCD 46. It should be a super performer with the Saito 72 you're using. If it doesn't blast straight up out of a hover it may mean that your scale is wrong.
My UCD 46 weighs 6 1/2 pounds with a Saito 72 and I'm using 30% fuel to get good acceleration out of a hover. My UCD must be way heavier than everybody else's. If my scale is wrong it can't be reading more that 1/4 pound high.
RM
Your scale is probably right. My UCD46 with an OS50SX weighed in at 6 1/4 pounds. I was not happy about it. GP says it should weigh 5 - 5 lbs. 10 oz.. I was using an ultra light weight Lithium Ion Battery too along with all the light weight stock hardware. Never got a chance to see how she would prop hang. The fuse above and below the horizontil stab broke on its maiden flight. Waiting for a prepaid shipping lable from GP so I can send it back for a replacement plane.
Rick