I tested this 33/3 propeller with 3s
P1.4*D33/3 Propeller
http://www.hobbyking.com/hobbyking/s...Sea_Rider.html
The weather was not optimal. The propeller also broke. Perhaps too much power.
I tested 4s with this 27 mm propeller...
Prop Nylon 1.4 X 27
http://www.hobbyking.com/hobbyking/s..._1_4_X_27.html
The boat didn't get speed at all without throwing it to water. This made the boat very uncomfortable to run.