Guys, I test flew my new Goldberg Matrix 40 yesterday and really like the plane. A while back, I had read a review here on RCU in which the plane had been powered w/ a Saito 72 and garnered a very positive report. At the end, the reviewer speculated that a Saito 91 would be even better.

Well, I've been looking for a low cost pattern/artistic aerobatic trainer and had a Saito 91 looking for a home, so what the heck, I figured I'd give it a try. Mods from stock were elliminating the original elevator control setup in favor of twin elevator servos in the tail and using a pull/pull rudder setup. Had to use 2 low-profile servos so they wouldn't interfere w/ each other.

Plane balanced spot-on w/ the 2 tail servos, by the way.

Performance is sparkling w/ the 91, APC 13X8 prop and 15% nitro fuel. Vertical is ridiculous (hangs at half throttle) and climbs like a homesick angel. Snaps on high rates were a blur, but the wings stayed on. High alpha knife edge was a thing of beauty- rudder authority is super strong. Did a couple of KE loops with no problem. Only (small) complaint is that designers got dihedral wrong because it requires slight aileron mixing w/ rudder since it rolls in OPPOSITE DIRECTION as rudder application. Clearly the wing needs a little more dihedral, but since it's a one piece wing, gotta mix it out with the radio.

Rolls were very axial and plane tracks very well.

Landings were uneventull wth no tendency to drop a wing even when I stretched one deadstick landing (ran out of fuel while having so much fun ) at a fairly high angle of attack. All-in-all a very good plane.