Ok, I did all the trimming routines, and it appears that I need to move the CG back and add right thrust. Drops when inverted, pulls out of dive, yaws left on vertical line, 1/2 right rudder on take-off, corkscrew loop.

Problem is, it seems to need quite a bit of both even though the CG is 1/4 inch behind nominal and it already has small amount of right thrust (GP Extra .40, Saito 72).

Is this normal? What should be the correct settings for non-3D aerobatics? Meanwhile, I'm going to adjust it bit-by-bit until it flys right.

It looks like a wing is heavier than the other one... It becomes apparent when flyin' inverted and a wing drops (usually the heavier one), also when looping: the heaviest wing will go farther than the lightest one resulting in sort of a half roll when entering or pulling out the maneuver.

Here are some tips that may help u finding the best CG location: when entering a 45° upside line and half rolling the plane, it shouldn't drop the nose before 15mt. at least, and begin a gentle descent. If the nose drops almost instantly, u're nose heavy (don't expect a dramatic nose drop for a nose heavy plane.)

When flying an straight and level path, roll 1/4. The plane shouldn't neither drop the nose instantly, but start a gradual loss of height.

About the left yaw on vertical lines, it's normal for every plane to experience some gyroscopic efect from the prop. It'll make your plane always yaw left (except when exceeded right thrust). It´s right to apply something about 15-20% right rudder on vertical uplines. More than that u need some more right thrust.

Make sure you move the CG back bit by bit, then try each new CG adjustment. It'll make your plane fly slower, fly comfortably knife edge, & a bit difficult to take out from stalls.

Hope it helps. Forgive any mispellings, not 1st language.

Greetings from México

I already corrected the lateral balance. I only added a tiny piece of lead to the left tip to balance perfectly.

When doing a 45° up line and 1/2 roll, it instantly starts to drop when inverted. I am moving the C.G. back 1/4 inch at a time. I think Great Planes has a VERY conservative balance point in the instructions. It looks like I will be well aft of the recommended position.

A very good flyer/builder in my club is helping me. He says that the yaw problem will be reduced with an optimum C.G. position but it appears that I still need a little right thrust.

Even though I'm getting few comments, I'll post an update for those that may be having problems getting into the groove with this plane.

My C.G is now about 4-3/4 inch back from the leading edge. Great Planes recommends 4 inches to start and no more than 4-1/4. I also added .040 thick washers behind the left side of the engine mount which gives about 1.5° right thrust and about .75° down. It is a much better flyer now. Lines are straight, inverted no problem, landings are even better. My favorite maneuver to test tracking is the shark tooth with half roll. It now tracks perfectly straight through the 45° line before and after half roll.