Originally Posted by sjhanc

Sorry about the poor quality, it was a gray day. Four level runs produced GPS speed readings from 110- 114 mph. TF GS P 51B, Rim Fire 50cc brushless, Gens Ace 5300 mah 45c 12s LIPO pack. CC120HV ESC. Graupner 22-12 sport prop, 8470 rpm. The chart indicated that this set up would have a pitch speed of 108mph so maybe the prop is a little better than 100% efficiency or there might be some unloading in the air. I was unable to down load data from the ESC. When I hooked up the Castle link software this morning it updated the app then it needed the firmware updated from 4.19 to whatever the latest version is. After getting the plane on the ground and before making a turn to return to the pits it suddenly let out the expensive gray smoke from the ESC. This ESC had had 50 successful flights before the firmware update and the flight duration and maneuvers were no different than before. It either was time to go or it choked on the new firmware. The plane was test driven around the yard for an hour yesterday and was run up to full power with the previous firmware with no problems. Another factor is the rough ground at the edge of the runway tripped the gear and it went up on the prop, stopping it, I shut it down but maybe not quick enough.