john picton Posted January 9, 2014 Share Posted January 9, 2014 Can anyone help, I have a GWS Twin Motor Drive RXC 7.2v motor with 8.6: 1 gearbox and need to know what size prop I should use to power a 23inch span Sopwith Triplane ( Aero Graphics Kit  free flight converting to RC, Thanks all Quote Link to comment Share on other sites More sharing options...
Willowlea Posted January 9, 2014 Share Posted January 9, 2014 Have you tried WebOcalc? Just pick your units and it will give you more options to input. **LINK** HTH Quote Link to comment Share on other sites More sharing options...
john picton Posted January 10, 2014 Author Share Posted January 10, 2014 Thanks Willowlea, I will use this once I have some idea of the weight etc Quote Link to comment Share on other sites More sharing options...
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