Some testing today...
Leopard 2445 3400kv
x432
Turnigy Marine 60A
http://www.hobbyking.com/hobbyking/s..._Boat_ESC.html
Turnigy nano-tech 2200mah 2S 35~70C Lipo Pack
http://www.hobbyking.com/hobbyking/s...dProduct=11943
Top speed: 46 km/h
Motor temp: running cool
Turnigy nano-tech 2250mah 3S 65~130C Lipo Pack
http://www.hobbyking.com/hobbyking/s...dProduct=19123
Top speed: 40 km/h one peak and second best 34 km/h
Motor temp: warm-hot
Turnigy nano-tech 1300mAh 4S 45~90C Lipo Pack
http://www.hobbyking.com/hobbyking/s...dProduct=18208
Top speed: 44 km/h
Motor temp: warm-hot
...so instead of complaining about lack of motor torque the batteries may have difficulties to deliver enough juice. Only the 2s battery was running well. With other batteries there was instant lipo cutoff. With the 4s battery this is understandable. But on paper the 3s battery should deliver plenty of power - in practise not. Or is it anyway a motor torque issue?