G,day Gary The Following Setup Is what i used in Skyfun Funjet and Taken Out and Installed In Stryker.
Prop Size Max for This motor Is a 6 x 5 Max
I'm Currently using a 6x4 Sports Prop.
Running 3S 40c Lipo with 50c Burst
Turnigy 80 Amp Esc
Test Results with wattmeter -
3s Lipo 40c 2250ma 50c burst, Using 6x4 Prop, Scorpion 2221-8 Motor, 80 Amp Esc (Mid Timing).
76 Amps ### 820 Watts ### 10.51 Volts Motor Temp I can Hold approx 40 Deg as its Outside and cooled.
Pivot tube Test Done many Times at approx 180kmh Horizontal
(Note Scorpion Calc software i have posted in earlier Threads, Great Tool)
Now Using The Scorpion Calc Software Results for the Above is, in Keeping with The 12.46 Volt setting Inputed into Calc using 6x4 Prop.
72Amps ### 898.4 Watts ### 85 % Effiecency ### 183.7 kmh pitch speed ### Motor Temp 120 Deg
(Pretty Close To mark of wattmeter test)
If You used a 5x5 prop for the above on 3s Lipo -
57 Amps ### 711.6 watts ### 92 % Efficiency ### 256.6 Kmh Pitch Speed ### Motor Temp 87 deg
If You used a 5x5 prop for the above on 4s Lipo It would Run To High as scorpion Calc warns of high Temp Overload -
A 4.7x4.7 Apc prop Results are -
72 Amps ### 1165 watts ### 90 % Effieciency ### 307 Kmh Pitch Speed ### Motor Temp 135 Deg
As For Lipo C rating see you Tube Clips Results Higher The c The More Punch You Will Get as Im using 40 c Lipo and the results show above any less C Rating will give Lower Results.
Also To keep In Mind More Torque with The Larger Prop But Less Top End
I prefer the 6x4 Prop as It Gives Good Speed and Great Verticals.
But I reckon You Need to get several different Size Props and Trial Each one and see what You find The best suited for you Flying Pleasure.
6x4, 5x5, 4.7x4.7 Props
Steve
http://www.youtube.com/watch?v=1i2CXGPd7ys
http://www.youtube.com/watch?v=nIP4jjPdx18