??? 4,480 KV MOTOR ON 5s ??? are you sure about that? now let me get this strait, kv times volt.= rpm. so ea. cell lipo is actually 1 volt higher than rated. so a 3 cell is (app.)12.6 v. x 4,880 kv= 61480 rpm, 4 cell =16.8 X 4880=80,032rpm 5 cell=21 v. x 4880kv=102480!!!!! IM NOT EVEN SEEING AS HOW THE MOTOR IS ONLY RATED FOR 54,000 RPM THEY SAY RATED AT 3-4 CELL..? ARE MY CALCULATIONS WRONG??? i must be doing something wrong after all these years..?