I flew my Ultra Stik for the first time and the nose just keep diving. I had to put almost all of the up elevator trim in to make it fly level. I checked the CG before I flew and had to put 12 1/4 oz weights on the tail end, and it was still a little nose heavy, but not much. Am I missing something?

I assembled mine with the Rudder and elevator servos at the rear part of the fuse (by cutting on sides of the fuse) and I still had to locate the battery at the back side of the servos bay. That helped me to get the exact CG. Flew great.

Hi!
As you have a wing without taper the C of G is easy to find. It should lay on the spar! That means 25-30%of the wing cord!
Hold your index fingers under the wing with no fuel in the tank...then the plane should balance slightly nose heavy.

Sometimes is just like that.

I would relocate the battery toward the tail as much as possible, in order to get rid of the extra weight you just had to add.

Balance it as shown in the manual or drawing, and continue with flight trimming.

Yep, I'm putting a larger engine on my UltraStick 40 and will be moving the battery pack to the rear of the fuze by cutting a trap door in the bottom of the fuze. I try not to add any weights until all components have been moved as far as they will go. As Colin Chapman, founder of Lotus always preached, Add Lightness

Trading out the TT GP42 for and Aviastar 53 moves the battery pack backwards about 6-8 inches.

The H9 manual is pretty good for balancing info. Follow it and the plane will be fine. The US has a pretty wide range of acceptable balance points, I seem to recall that it's about 1/2 inch wide area and right around the spar.

Jack

Over the years I've had 5 Ultra Sticks, two 40 size and three 60 size. All of them were nose heavy. It's just the plane I guess. With the 60s, I put the elev and rudder servos in the fuse sides as far back as possible and cut a hatch about 1/2 way to the tail for the battery. Those two mods really helped to balance the plane. They only required a little weight in the tail after that. Try to add weight only as a last resort.
Paul