My name is Scott Masterson. I have been performing marine conversions for years. My own personal projects are a 22ft Pontoon Boat, a 17.5ft 147HP Bowrider and a 9.8ft inflatable. Here are some videos if you are interested:
Here are my thoughts regarding the correct lower leg and prop for electric marine propulsion.
First, I am curious as to why people are convinced that they need a larger lower leg to accommodate a motor that is smaller in power than it is designed for. I understand the concept of electric motors providing max torque at revolution one and speaking as a guy who has "done that", let me assure you that all you will doing is creating a load on the motor beyond what the power curve of the motor's design. Simply put, most motors are designed to deliver peak efficiency and power at 3,000 RPM. If you put too big of a lower leg and prop that is not designed to that motor's max power, but two to three times it, all you will do is over tax the motor and it will become less efficient and most likely overheat before it can deliver it's rated power.
What you need to do is to match the lower leg to the continuous power rating of the motor. So if you have a 3kw motor, (4hp), you need a 4hp lower leg.
Scott
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Posted by: Scott Masterson <smasterson2@gmail.com>
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