Here's where I'm at now, this after maidening the plane yesterday:

My first impression is that the plane is tailheavy. My first Extreme had no additional weight for balance, but the plane ready to fly weighted 5.2 lbs. This one came in at 4.6. I know the engine and radio gear weighs the same as before, and everything's in the same place, so the difference is airframe weight. Most of the airframe is behind the CG.

The in-flight symptoms:

1. Trimmed for level flight at half throttle upright, it needs around 1/4 stick forward to hold level inverted.
2. Trimmed for level upright flight at half throttle, put the plane into a steep dive. As the speed builds, the plane pulls out of the dive on its own. I'm concluding that the up trim to hold the nose heavy condition is becoming stronger as the speed builds, but since the weight in front stays the same the plane pulls up as the speed increases.

Wingtip weight: If I place the plane upside down it won't balance on the fuse, the right (engine side) wingtip falls to the table. Even if I put the left wingtip down, it falls back over to the right. Doesn't feel off in the air, but I'll put a bit of weight on the left tip to get it into balance anyway.

The plane doesn't seem to want to fall out of a hover in any particular direction. Leads me to believe the thrust line is close to correct. I might have to increase right thrust once the weight is on the left wingtip, we'll see later.

I set the ailerons to be level with the centerline of the wing chord. I know some are setting them to follow the line of the bottom of the airfoil, but I tried that on my last Extreme and I liked it better with the ailerons level. Is there a definitive test to determine where the ailerons need to be?

Thanks,
David