A misaligned linkage.

What happened was he started the engine on his own while I was tending to my plane. He called me over and gave me the thumbs up. I did give the engine full throttle for a second with no evident problem, along with the normal preflight check. I thought it was idling a bit high, but not high enough for a problem. I looked at this throttle trim and it was a bit over half way. After take off and climb out I reduced the throttle and ending up pulling the left stick all the way back,,,, no response. I figured no problem, reduce the trim. BOOM,,,MAYDAY, MAYDAY, after reducing the throttle trim all the way back/down, the engine stayed about 1/2 throttle as if it increased throttle on itS own after take off. You know the rest of the story. After getting it back down, I took it upon myself to adjust the linkage for him be it's second flight which was perfect. That Sig Kadet is a nice, nice flying plane. Looks great in the air and a real floater.

Ross, I was preparing myself to do the same. I knew I was in for a long flight as he topped off the 14oz tank. Luckily, the engine stalled and I was able to land it safely dead stick.

Redwing,,,good to hear ya chime in again,,,