Re: [electricboats] Proper propellor

That sounds like a reasonable size, pitch and blade number. Any idea where I might find such a right hand prop with a 1" shaft?

tom@tsteininc.com

850 259-8600

Thos. Stein Inc. 

78B Ricker Ave. 

Santa Rosa Beach, FL 32459

Florida underground utility contractor license RU0058046

Florida plumbing contractor license RF0057995

On Mar 7, 2020, at 18:32, rjtrane via Groups.Io <rjtrane=me.com@groups.io> wrote:



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.