[FlyOne]

I am running the Smart-Fly Sport Plus set up on all 2 Giant Scale Airplanes. One is a 50cc size and one is a new Aero Works YAK 54 with a DA 85CC engine. From the very first flight, I have experienced throttle problems. On the first landing the throttle began to surge and we used the Ignition Cut-Off to get it on the ground safely. The Throttle Servo was replaced and it did the same thing on the next flight. Again, cut off the ignition and dead stick it in. I then took the aircraft home and worked on the bench, thinking I had isolated it to the white control wire on the Smart Fly "A" lead which feeds the throttle (if wiggled, it was loose and caused the servo to glitch) and is one of the leads furnishing battery also.

Yesterday when I was preparing to fly and started the engine, it went to full throttle and stayed there. I again used the ignition cut-off to stop the engine. This morning I removed the servo which would not operate at all in the Aircraft and then plugged it in, just for fun, into the Smart-Fly board "A" slot, it's normal position. It worked fine!

So basically I am fighting an intermittent problem that cause multiple symptoms. I have a spare Smart Fly board from a now retired aircraft and could substitute it for the current board. In addition, I have a spare 921 receiver from the same aircraft I could try.

Has anyone ever run into this type of servo problem before and if so, what was the cure for the problem?

Thanks
Mike