KW,

that was my plane and all we did was add more throw in the radio. His was fine.

To get this plane ready for IMAC, you MUST go through a trimming checklist as just about everything needs some changes to get it to fly the way it should. Remember that you need to get the engine/prop combo correct before starting to trim as simply changing the prop to another brand can change you trim.

I just got back from my "lunchtime" flights and here is the final results from my trimming.

total trim flights was 27. These were 5 minute flights with someone taking notes on the more complicated things

I ended up with the CG roughly 1/4 forward from the recommended spot, 3 degrees of right thrust, two degree of up thrust, I think I sanded about 1/8th inch off the back of the sing saddle. I have 3 percent up elevator for left rudder, 5 percent up elevator for right rudder, no aileron mixes and no downline mixes. Lateral balance took one half ounce on the left wing. I have no elevator trim set in the radio and one click right aileron. I use a 10X and have the trim steps set to "one" instead of the normal "4"

Previously I had 10 percent elevator in both directions and 3 to 5 percent opposite aileron. With no thrust changes I could not hold a straight upline as the plane pulled hard left as soon as it slowed the slightest bit and pulled to the gear immediately. I also needed 3 percent down elevator for a perfectly straight downline.

Now I can pull an upline and with no wind let go of the sticks and she just keeps truckin' straight up. In KE I hold whatever rudder I need and she goes in a nice straight line. Inverted flight takes about 1/8th of the stick which is perfect for IMAC which translates when going up inverted on a 45 degree line under 80% power to the nose dropping to level in about 5 to 7 seconds.

My throws are roughly 1/2 inch on the elevator and 1.5 inches on the ailerons measured both at the root close to the fuselage. the rudder is 60% of full throw. All expo setting are at least 60%, that way I can "hide" line corrections with the rudder by moving the stick a tiny bit and the plane will not appear to move the nose

Moving the CG forward cleaned up all IMAC maneuvers and 3D did not suffer too bad. Snaps all but stopped over-rotating but it's still there so be ready for it

As you already know I'm using a DA50 on the J'tec Pitts muffler and a PT models 22x8 prop. The plane is trimmed for that combo and it works well. Lots of power when I want it and nice a quiet for decent IMAC sound scores as I do not need much over 1/2 power for most all of the basic sequence, except maybe 3/4 power when going on a 45 degree upline or a straight upline.

Now I have had this plane for somewhere around 500 flights and up until recently I thought I had it trimmed correctly, I then let an advanced IMAC pilot fly it and took his advice and OH my is it much better