Re: [electricboats] Proper propellor

I have Motenergy 10 kW motors from Thunderstruck on my 40’ 23,000# catamaran. My max speed is 6.3 knots in a calm  continuous max speed is 6 knots at about 3/4 power  

I assume your motor is 48v? What is the max RPM? Mine turns 2,400 RPM. Based on prior sea trials I decided a max prop RPM should be 800 RPM. Therefore I installed a 3:1 reduction. I have 18” diameter X 14” pitch 4 blade props.

if your motor turns 4,800 RPM I’d suggest a 3:1 reduction and a 3 or 4 blade prop close to 18” diameter. Your 2-blade just doesn’t have the surface area to get the maximum power of your motor to the water. 

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