Electric conversion of a Crescent 5 hp outboard

An old Crescent 5 hp outboard motor that I converted to a powerful electric outboard motor, capable of 5kW of continuous power!

The cost for the conversion was around 1000€, excluding the battery cost which was around 700€. I worked on it much of my free time for 5 months. Some useful links that I mention in the video:
Propeller generating tool: https://www.wageningen-b-series-prope...
Winding calculator: http://www.bavaria-direct.co.za/schem...

Motor: FreeRCHobby MP12090 https://www.freerchobby.cc/collection...
Controller: Fardriver ND84530 (from AliExpress)

I don't talk about the battery in the video, but it is a 2,5 kWh Li-Ion battery (12S = 44 V) that I put together from refurbished 18650 cells. It weighs about 15 kg and is fitted inside a waterproof case. It should not be discharged too quickly, so 5 kW of power was the most I wanted to test. I use an XT-90 connector to the battery, which can only handle so many amps (5 kW is 120 A on 44 V).

Here are some performance figures of the motor on my boat. The boat weighs 90 kg, and the motor and battery are around 40 kg together, so with one person in the boat it is around 200 kg, and 270 kg with two persons.
With 2 persons:
400W 5 km/h
750W 6-7 km/h
1000W 8 km/h
2000W 11 km/h
3000W 12 km/h
5000W 14 km/h
With one person: 4500W 16 km/h
Range at 400W: 30 km
Range at 5000W: 7 km

I was hoping for a bit higher top speed on my boat, but I think the large motor has a lot of drag underwater, to get higher speeds a slimmer design might be needed. Or just more power... :)

Please feel free to comment if you have any questions, I will try to answer them to the best of my ability!

Timestamps:
00:00 Intro
00:35 Design goals
01:00 Removing old engine
01:32 Electric motor and driver
02:15 Motor rewind
04:42 Motor waterproofing
07:28 Motor mount
08:30 3D printed propeller
09:15 First test!
10:13 Test on plywood boat
10:48 Top speed test!
11:11 Test in some wind
12:25 Drive-by
14:06 Motor inspection after some use
15:01 Summary of the project