DIY Outboard

[Otto44]

For my 1967 wooden Boat which I fully reworked, I have designed and built an outboard engine. It is a 85165 fully waterproof BL Innerrunner, capable of 18Kw (according to the maker) As I can run only 4,4Kw becuase of local laws, it will be a long lasing motor I hope. I am running it on a 14S1P LiIon battery with 218Ah. The BMS can handle 150A. Hope to have it in the water soon.

In the beginning I was thinking of a puller prop configuration, as in my opinion the puller prop has better efficency than a pusher. Any opinions about that?

 

[Encantadora]

Bellissimo. Stavo anche guardando l'85165. Vorrei usarlo come fuoribordo su una barca a vela da 23 piedi. Ho bisogno di navigare a 4 nodi e una spinta di 150 libbre. Sto piangendo a 48v lifepo4. Spero di avere tue notizie. Per ora ho messo due trolling da 1800w e funziona.

 

[Encantadora]

Ecco un video con prova controller esterno jarak

 

[Otto44]

no che un video

 

[Encantadora]

non riesco a caricare mi dice che non è l'estensione giusta. L'ho fatto con il cellulare

 

[Encantadora]

Questi

 

[colmor]

How did this turn out? I'm also working with the 85165 motors as an outboard. I ended up putting two of them in-line and also through a 4:1 planitary gearbox to swing a 12x12 propeller. Moves my 380cm SIB along pretty nicely.

 

[Otto44]

Frankly speaking I am not satisfied with the performance of this motor. Gets quite hot at more than 4 Kw. So far away from the powerlevels stated on their webpage. Would not recommend it.

 

[OlderGiantFan]

Frankly speaking I am not satisfied with the performance of this motor. Gets quite hot at more than 4 Kw. So far away from the powerlevels stated on their webpage. Would not recommend it.

Could that have something to do with the high mass of the boat, bogging the motor down? I know the dynamics of a prop in water are totally different to wheels on a road but if the boat was moving a faster would that take load off?

https://groups.io/g/electricboats/topic/electric_boats_re_motor/56065384

From some facebook post.
Increasing the mass of an electric boat (e.g., more passengers, heavy batteries, or gear) increases the load on the electric motor leading to higher torque requirements and increased current draw. Electric motors are designed for specific operating loads and excessive weight forces them to work beyond their rated capacity causing heat to build up faster than it can be dissipated.

 

[ljbred08]

Interesting thought! I would normally think the prop, motors in water greatly depend on the prop for efficiency and the prop is normally the single biggest factor if the motor is not running optimally.

I guess I'll be finding out how well this motor works--I have one that I am going to put on a canoe (the wide, plastic type, not a traditional canoe that is narrow). Going to try to start with about 6kw. Hoping to break the unrecorded speed record for canoes
So if all goes well should be able to post some info in a month or two.

 

[gromike]

That's 8hp, and, yeah, you should break the speed record for your canoe. It would be nice to graph out the power used to the speed obtained to find the most efficient boat speed for travel.

 

[last20]

Frankly speaking I am not satisfied with the performance of this motor. Gets quite hot at more than 4 Kw. So far away from the powerlevels stated on their webpage. Would not recommend it.

Really nice work on the outboard..

I'd like to do the same thing and AI suggested a submersible Reacher Tech D70L165 motor and surface piercing prop.

But how does your outboard kick back if you hit something?