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: www.wageningen-b-series-prope...
Winding calculator: www.bavaria-direct.co.za/schem...
Motor: FreeRCHobby MP12090 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

[@ZachsGarage1]

Mad respect to you doing the motor wire windings by hand!

[@MarkRyanAB]

The fact that it still looks like an old ICE motor is a nice security feature as well!

[@sarcasmo57]

Love the noise. So quiet.

[@helicopterdriver]

I used to rebuild very large electric motors. We had a varnish tank and soaked the stator in varnish overnight. Let it drain after removing and then into an oven to bake it on. That lasts until the net overhaul. It should work for waterproofing as well.

[@AntonMakesStuff]

Thanks, that is a good tip. It is probably more heat resistant as well, compared to epoxy.

[@TheGreenBoater]

There are few boaters who would attempt this project. Thank you for your leadership and vision. I truly believe e propulsion is coming big time into the marine sector - some areas it is already making huge inroads. Who knows? You may have helped spurn this growth! kudos. ~tgb

[@troyguererro0898]

5 HP TO 6.7 HP real quick. Nice job man.

[@luxmonday]

Well done! The decision of whether to have the motor in or out of the water is definitely a tradeoff between efficiency and ease of use/design. A lot of electric outboards are motor in the water for cooling, but looking at the effort you put into the motor I feel that motor out of the water might be an easier conversion. There are also other solutions for motor in the water such as running a brushless motor in mineral oil with shaft seals to keep seawater out. The differential pressure across the shaft seals is lower with liquid on both sides. But eventually shaft seals fail as they have a tough job to do. I'm amazed they work at all. I'm also impressed in the propeller, it's not often you get to 3D print something that works at meaningful power in the real world!

[@johnramirez5032]

They metal printer parts have come a long way. Those parts are used by the militery . Its pretty hard to beat the durability of machined parts. I know the plastic gears on camshaft in the old day were ok for a while but ultimately failed. Metal is nuch more durable.

[@sail4life]

Brilliant project! You sure took all the hardest options and pulled it off! Congratulations on a job well done.

[@AntonMakesStuff]

Thank you very much! I just looked at your catamaran, it is very nice, well done :)

[@micheljansen85]

Please dont stop making videos!

[@ddexter8723]

Thanks for sharing your video and knowledge that you gained from your project. I have been wanting to make a really nice little electric outboard for the longest time.

[@carlanderson4139]

Great video. Looking forward to many more.

[@stefangabler3469]

Amazing job, Anton! My boat uses a pod motor that is constantly submerged in the water, really don't know how they keep it sealed all the time, impressive!

[@AntonMakesStuff]

Thanks! Cool, yeah I don't know how they make sure no water comes in. Good seals I guess :)

[@antonio.stefanelli]

the project is really very very interesting and I am designing a similar one myself. But I think replacing the thermal block with an electric motor is the right choice for two reasons: - keep the electric motor away from water - use the foot and the original aluminum propeller that does not twist under the large torque of the electric motor - if you have cooling problems you can always take the water pumped by the original foot impeller (for models that have water cooling) As soon as I have time I too start with my conversion project which involves the use of a car alternator modified into an electric motor

[@AntonMakesStuff]

Indeed, I agree totally. Everything becomes so much simpler when it does not need to be watertight! Interesting, I hope to see a video of it one day :)

[@johnramirez5032]

I saw a guy put a alternator on a bicycle. It was almost scary to watch. I still found it very clever. How do people find rhe time? I hope you make a video of it too.

[@jonwic7869]

Congratulations! Great job and great video! Keep going.

[@zinahe]

Well done! Very impressive. Thanks for sharing.

[@ninehundreddollarluxuryyac5958]

Amazing project! So nice that it goes fast! Anything factory-built that goes fast enough to be useful is too expensive. Brilliant idea to re-wind the motor!

[@AntonMakesStuff]

Thank you! Yeah, the motors by torqeedo or epropulsion are quite good but also quite expensive. And if you add the batteries to the cost the installation becomes very pricy.

[@pierrestenborg3125]

Inspiring build! Thanks for sharing!

[@feracingdf29]

Veldig kult prosjekt! Imponerende.

[@geoffreysampson2803]

I threw a 2KW BLDC motor on an old Merc 3.3 I had. I bolted together some aluminum plate, 1/4" (6mm), and coupled the motor to the shaft. I use it on my dinghy to get in and out to my moored boat. It pushes me at 5kts. After 1.5 seasons I'm really happy with it. Your detail is far greater than mine. Much mor powerful. I waste a lot in pushing the gears and the water pump impeller that's just stirring the water. If I built a 5KW I'd use the waterpump for cooling, but in the water is much mor efficient.

[@AntonMakesStuff]

Cool! Yes, using the original impeller for cooling is a good idea if you have a powerful motor :)

[@usertogo]

@15:00 would also have to vacuum infuse the resin into the rotor and stator...

[@tcap7917]

I applaud your efforts

[@Bi3tKhongEm]

Thank you for sharing. Thank you for your time I love it❤

[@johnpolitis2236]

congratulations on your project 👏 you can put wedges on your transom to get more negative trim

[@TechyBen]

Wow. Amazing. I'd have gone for a shaft drive. But to do a direct drive is big balls move!

[@relativelygood9995]

This is really impressive actually. Way better and more professional than the RCLifeOn video I came here from.

[@AntonMakesStuff]

Thanks a lot!

[@jakubmedrek3719]

Hi. Nice work. Congrats. It helped me a lot. Thank you

[@michielderuyter6011]

The first converted engine that really works

[@ronaldharris6569]

This was very educational good job

[@videostars9194]

Yes that was a great project, well done

[@Yosomy]

wow, amazing job!

[@Stephenpikeman]

Excellent job. Thanks for sharing. Not something I am willing to attempt. Regards Stephen

[@8urgerkingfoot931]

Riktigt bra jobbat. Hade lätt velat göra samma projekt👌

[@electrosync]

Great project! Interested in your battery setup if you make another video on this.

[@arjovenzia]

I spent last weekend mucking around with small electric outboard on a little sailing catamaran with a damaged mast. I gotta say, electric boating is awesome, so peaceful. however, Im gonna need something bigger, as it didnt have enough torque to go into a decent headwind. however I really enjoyed it, and can justify putting some more effort into something more powerful. I really like your solution, good work

[@AntonMakesStuff]

Sounds nice! A small catamaran is maybe the best (at least most efficient...) vessel for an electric outboard :) Thank you!

[@sniperviperful]

You are a very clever guy

[@kittyztigerz]

making motor waterproof is harder to keep it from not rusting conver gas engine to electric motor is little easy but reliable no rust no under water motor unless have pump in shaft that could use it cool down esc (electric motors control) i have done few conver but never make video of it (it was for customers they wanted blowed up engine removed and put electric one on it so i did and they have cut floor open to remove gas tank and put battery in it) motor they where using was from electric forklift 300vdc (yes it took a lot of battery to match same voltage) i grate to see you try ur best n u did awesome

[@madhukeshnp]

"I turned into this" I was expecting a ooommffff. But it went smooth 😅

[@_CAT-lg4sr]

Well done for a first time learning experience. The results are very good. I love the fact that from the outside, it looks just like a regular outboard "motor". The R & D you did and your knowledge and skill set are highly commendable. As intelligent as you are, you have probably already figured out what my observations conclude. If you choose to do another, do all the machining of the stator and rotor prior to any rewinding. I would try electroplating the rotor and stator with a heavy layer of copper or maybe cadmium on both, to help combat saltwater corrosion prior to rewinding. I don't know if this would affect the magnetic gauss or induce eddy currents in the copper plating leading to it heating up. The point of that is to not rely on a coating of epoxy on the close tolerance surfaces of the rotor and stator and still keep a barrier between the saltwater and the steel.

[@yacahumax1431]

great video

[@shibuigardenbungalows0420]

Genius!

[@pederlindberg2097]

Bra gjort, mycket imponerande.

[@AntonMakesStuff]

Tack så mycket! :)

[@kojomensah7474]

Each one teach one thanks you for this vedio and yr time

[@ockeojoj]

Väldigt roligt att du använde den gamla motorn, de är ju väldigt fina, även om de är lite omoderna.

[@AntonMakesStuff]

Tack! Ja, jag gillar designen på kåpan, och fin färg :)

[@Superkuh2]

Impressive. If you 3D print a water propeller again consider sanding/smoothing it. It will significantly increase the thrust for a given power.

[@tonyunderwoodfilm9773]

In awe of your capabilities. Next maybe add solar panels and hydrofoil and give us a little bit of info on batteries. Very good video! Again , respect for your abilities and knowledge.

[@AntonMakesStuff]

Thank you very much for those kind words. Yeah, hydrofoils and solar cells would rock! Would be super interesting to build something like that :) Regarding the battery I exaplained it in another comment. If you have some other questions on the battery, just ask :)

[@kstorm889]

Great work, I know your pain. I did and outrunner underwater for my diy efoil and did the epoxy magnet process. what I did was make a dam at the end of the magnets and filled the entire void with epoxy and had it spinning in my drill press on its side for a few hours. I got a very even coat with no rubbing. my next project will be an outboard conversion, but it would probably just be easier to take the wing off of my efoil and clamp the mast to my boat haha

[@AntonMakesStuff]

Thanks! That sounds like a good method (I have actually read about that on efoil.zone ;) ). Haha yeah, that might be easier. It would be interesting to see how a efoil motor would perform on a small boat.

[@nunomascarenhasribeiro]

keep original gear an propeller and mount the motor in de cowling.....that would be a perfect conversion ;)

[@tilongatao]

cool!

[@jacquesb5248]

very good job. next have all the components in the old motor housing including battery and controller. have an external plug for recharging and maybe solar?

[@AntonMakesStuff]

Thanks! It would be cool to have solar charging. The battery in the motor housing I don't think is a good idea, it would not be possible to fit a battery large enough for long range or a powerful motor.

[@tamaralee4108]

If the motor floods with water then a significant portion of the motor power is absorbed moving the water inside the motor. That leaves less power available to turn the propeller. The sealed submerged motor, or the motor mounted where the ICE motor was would solve this issue.

[@thilltony3362]

Very interesting video, and great job. I'm very interested in your plywood boat. It's very good looking and seems to handle rough water well. A video showing us the boat in detail would be nice. Could you do that for us? Thanks again.

[@AntonMakesStuff]

Thanks! The boat is build from these plans: www.timwestonboats.com/small-boats/boat-2-weeks/ I might make a video, we'll see.

[@codywhiteside152]

Genius

[@ronaldharris6569]

I use 2 part epoxy paint for waterproofing metal and wood it fills good and you can see any failures in covering because of the pigment

[@AntonMakesStuff]

Thanks, that is a great tip! It is hard to see the coverage of transparent epoxy...

[@michaelsimpson9779]

Volvo made these motors as well. I still have one. Nice work.

[@olafschermann1592]

Awesome. I am curious if there exist some more suitable kv motors out there.

[@AntonMakesStuff]

For sure, for example from freerchobby you can order customized Kv motors

[@djmips]

I really really love how quiet it is. I think it would be worth developing this concept to something reliably sealed. How much louder would an inrunner engine in the old ICE position be compared to what you developed?

[@AntonMakesStuff]

Me too, a quiet boat trip is very nice! I don't know really. I know inrunners generally are quieter than outrunners, and if you use a high quality PMSM motor with a FOC controller it should be very quiet (but probably not as quiet as a submerged motor...). I think you could achieve even less noise with an induction motor, as it has less vibrations.

[@michaelwilliams4980]

Put the battery as far forward as possible. Will help with the boat weight distributing.

[@electricbaylinergoesfishin870]

you could use the da85-6 high torque motor from denzel/east gem to replace the ICE motor, its an Asynchronous Induction motor that does not use magnets and has 150 celsius continuous operating temperature (dont need water cooling)

[@AntonMakesStuff]

Thanks for the tip! I've been looking at Denzels motors, and they are nice but quite heavy. An induction motor would be very good as it has less noise compared to a BLDC. The motors are also quite cheap for being so powerful :)

[@johnramirez5032]

I am very impressed by your success. Salt water motors are very difficult indeed! You should be able to get a job with your mechanical knowledge if you dont already have one. Your tip to put motor on top is a great one. I would never attempt such a project. I keep my boat out of salt water because of how salt water destroys things. I have a plastic boat with a 5 hp gas motor and it really does quite well. I tiy with the idea of putting an electric motor but why ? It works well. Good luck on all your efforts. You deserve it.

[@AntonMakesStuff]

Thank you! Yes, salt water is very tricky... I work as a mechatronics engineer right now and I'm very content with it :) Sounds good, you shouldn't fix something that isn't broken ;)

[@johnramirez5032]

@@AntonMakesStuff fantastic. Your doing well with english and thats good too. Do you live in America?

[@AntonMakesStuff]

@@johnramirez5032 Sweden

[@johnramirez5032]

@@AntonMakesStuff Sweden sounds like a wonderful place to live. Cities here are plauged with people who are not desirable to be around. I hope your country is better than ours. I view it so.

[@ct1762]

saltwater issues were largely solved 50 years ago by outboard manufacturers lol

[@ironclay3939]

I think your assessment was correct - self inflicted iron rust. I can't see how you can waterproof a motor, the very nature of water means it gets in or out of places it shouldn't. Your hull looks like a good Netting boat flat water, fishing using a net. What you don't need is something to catch under your boat. Here's my idea, "Electric Jet Power" - I know 'sounds eggciting right' so the motor is on the floor shaft through the water intake to the prop and blow it out the back using steering. What could be more exciting and simple?

[@AntonMakesStuff]

Jet drives are inefficient at low speeds, but it would be very exciting indeed! But far from simple I think.

[@samuelschuur7044]

This is very cool - do you think the printed propeller deflects underwater reducing thrust? Also do you have any details of your plywood boat somewhere?

[@AntonMakesStuff]

Thank you! No, I don't think it deflects (not much anyways). The propeller blades are quite thick actually. In the propeller design program I used (www.wageningen-b-series-propeller.com/) I specified plastics as a material, so the program takes that into account and changes the geometry to handle the material. Very neat! My boat is a slightly modified version of this boat by Tim Weston: www.timwestonboats.com/small-boats/boat-2-weeks/

[@across_the_plane6800]

Very standard diy here 🤣. Great work!

[@radodanchev8600]

I have a emotr I need to wotterproofe. How did you apply the epoxy

[@tomasis7]

Bra jobbat. I want do similar one but put the engine above. Will you do an new revision? Replace with thickwr wire is such a good idea.

[@AntonMakesStuff]

Tack :) I have many ideas for future revisions... We'll see what the future holds :)

[@fcguy2778]

I'm really surprised that a 3d printed prop could handle that amount of power/force. Did you use any post processing for strength?

[@AntonMakesStuff]

I just sanded it smooth. Printed in PETG, which is a tough material :)

[@LQhristian]

Excellent work!! Will the 3D printed prop survive 10kw of power??

[@AntonMakesStuff]

I tested it with 6 kW and it held up! The program that generated the propeller geometry (www.wageningen-b-series-propeller.com/) takes the strength of plastic into account, so it will at least hold for 8 kW as that is what I specified. I think 10 kW is totally doable, especially if I print a slightly larger propeller.

[@utz3710]

I would of just bought a store bought motor and spend the time I saved 🍻 drinking 🍻 beer!!!!!!!!!!!!! Any one else out there who would drink to that????????? 😮

[@AntonMakesStuff]

Well, I don't like beer so what can I do? :)

[@MixiMera]

Great impressive work!! Will try something simpler with my son and his Fugitive boat. Are you in Stockholm or Göteborg by any chance?

[@AntonMakesStuff]

Thank you! Sounds fun. I live in Stockholm :)

[@MixiMera]

@@AntonMakesStuff Me too Åkersberga.

[@AntonMakesStuff]

@@MixiMera Kul! Om du vill kontakta mig privat eller fråga något är det bara att skicka ett mail, den finns på min kanalsida :)

[@BirdbrainEngineer]

Awesome project and it turned out well! For future, constructive criticism - I suggest taking a lot more video of everything you do. I know its hard to remember and set up a nice looking shot... I myself am not great at it yet either, but I am slowly getting better and trying. Generally people want to see videos on youtube and not slideshows ;) That is, of course, if you even care for reaching a wider audience... if not, then slideshow away! :D

[@AntonMakesStuff]

Thank you! Just watched your video on the axial motor, it was cool! Yeah, at the start of the project I didn't have in mind making a video. However, as I am quite satisfied with this project and I have used a lot of other videos as inspiration, I wanted to contribute some myself to the youtube archives :)

[@BirdbrainEngineer]

@@AntonMakesStuff Sort of the same - got tired of only consuming content (again), and for me, I figured it's the perfect reason to really start making projects and finish them too haha.

[@seanbevan7]

A simple job made very, very complex. Why?

[@flotsamike]

I was expecting to see a conversion where you just replace the ice with an electric motor. Very impressive. What voltage battery did you use? I would think 12 v would require to large of cables.to carry 400 amps.

[@AntonMakesStuff]

I use a 12S lithium battery, ca 44V. 12V would be too little voltage :)

[@SudburyDualSport]

Awesome project!! I've been wondering why more people aren't converting to electric outboards. I like your idea of running the motor in the water to keep things cool, but it looks like that has some drawbacks too.. I might stick with my plan of using an out runner 10-15kw motor in place of the ice engine and using the original prop and gear case. What are you using for a battery set up?

[@AntonMakesStuff]

Thank you! Yes, there are not many people doing it. I think the main problem is the battery, boats draw a lot of power and if you want to get far the battery must be large. Putting the electric motor where the ICE was is great, it makes everything much easier! :) But it will just be noisier and harder to cool well. I have built a battery of 12S20P 18650 cells (Samsung 35E) and it is placed in a watertight case. The BMS is an ANT BMS rated for 300A peak (IIRC). The total capacity is approx 2,5 kWh which is on the low side for this outboard, I would like to have at least the double capacity. But then it would be very heavy... (the current weight is 15-20 kg, so it is OK to carry).

[@michaelsimpson9779]

Cost, and energy density...... you just cannot store enough power for these to be a direct replacement option for the majority of applications/people.

[@archer721]

@@michaelsimpson9779 the battery is always the weakness… a gas/electric hybrid could be a better option until battery capacity tech can catch up… if you really want to push the option? Maybe a hydrogen generator fuel cell instead of gas??? Electricity to make fuel and fuel to charge the battery and run the motor simultaneously… but I don’t think this would work well for a smaller boat.

[@ct1762]

@@archer721 but why? what earthly reason would you go to a worse technology vs. 100 year old design with more speed, 10x the range, 1/10th the price, and reliability in saltwater? if you want even better, go with a near silent modern 4 stroke outboard with fuel injection for the same price. no smoke, and can cruise 30% farther than even a 2 stroke.

[@archer721]

@@ct1762 - well… a 4stroke isn’t “nearly silent” by any means and a hydrogen generator in the ocean would literally give you an endless fuel supply. There are many reasons. I’m NOT against the use of internal combustion engines or petrol by any means, just saying there are other ways to make fuel for them and other ways to push a boat around the water…

[@TheWadetube]

I believe that your motor was originally 12 to 22 horsepower and you made it into a 7 hp motor. You could have mounted the motor in the top, air cooled and left it as originally manufactured and purchased a ECM to control it and the standard lithium batteries .

[@AntonMakesStuff]

Yes, for sure. It would have been much easier :)

[@zaprodk]

So the motor controller is rated for 84/96V - was there any problems programming it to run from nominally 48V only? What options is there for programming/setting up the controller?

[@AntonMakesStuff]

Initially the motor raised its low voltage alarm, but the low voltage level can be set in the settings. I think you should not go too low on the controller voltage, for example 24V might not have worked. I used a Bluetooth app to set up the controller, but you can also connect via USB with a computer. The app has a few bugs, and all settings are far from obvious what they do, so it can be frustrating to set it up.

[@AboriginalAmerican]

Is this boat cross-continental possiblev

[@olafschermann1592]

Where did you put the battery? Inside the motor housing or inside the boat?

[@AntonMakesStuff]

It is inside the boat, in a waterproof case. A lithium battery, around 2,5 kWh

[@planbeeapiaries]

Put the batteries on the bow of the boat for balance

[@je7647]

this is great but it would be amazing at 72 or 96v would beat all those 20k e outboards

[@andregrundler9961]

Hi, can you use an e-bike conversion kit,? 48v kits & 2kw - 5kw motor?

[@AntonMakesStuff]

Hello, I guess you can. A hub motor might be tricky to mount, and also not spin very fast (around 2000rpm is good for a propeller). But I'm sure it could work. Also worth to note is that many cheaper controllers advertise very high powers, like 5kW, but that is the absolute peak power and can not be outputted for very long.

[@chrisgosselin6399]

Use cedar shingles to shim it 10degrees (engine transom)

[@chrisgosselin6399]

Well provided there’s room…

[@AntonMakesStuff]

@@chrisgosselin6399 Haha yep, there isn't really. I could angle the outboard a bit though by using some thin wooden pieces.

[@samsonfpv8902]

The title doesn’t do this video justice.

[@AntonMakesStuff]

I hope you mean in a positive sense, and in that case Thank you :)

[@jackploof224]

Hello you took the motor head out of the motor did you think of trying to mount the elec motor were you took out the gas one i think it would save you alot of work you would not have to make a prop and you can change props to bigger or smaller then you would not have to worry that your motor was in water all the time and you could mount a bigger elec motor on top .

[@AntonMakesStuff]

Yes, I did think of that. I discussed it a bit in the end of the video

[@rolfnilsen6385]

@@AntonMakesStuff The bevel gear is quite costly energy wise - you chose the most efficient solution. Perhaps a belt drive could be an alternative if the inside of the stem had room for it. Great video! It was very interesting and I subscribed in the hope of more videos from you. BTW: The landscape reminded me of the southern parts of Norway.

[@AntonMakesStuff]

@@rolfnilsen6385 Thank you! Bevel gears have some losses, however in my case I think the large motor diameter will lead to larger "losses" at high speed (higher drag than a normal gear casing). A belt drive would be very interesting! My goal is to make more videos, but I have no idea when or what the next upload will be :) I filmed the video on the Swedish west coast, so it is not far from southern Norway!

[@rolfnilsen6385]

@@AntonMakesStuff You do good stuff so looking forward to any new videos your creativity might cook up ;-)

[@Tomasz.Abrahamer]

Did you even try to see if rewinding was necessary?!

[@stephenwyatt7305]

trolling motors are not expensive at all, 2 of them is really good

[@AntonMakesStuff]

I agree, you can find some of them for really cheap, and if you just want to go slow they do the job well. But if you want something more powerful you have to look elsewhere :)

[@GWAYGWAY1]

5 kw is about 7bhp

[@Gergosh]

Hi Anton can you share. how much distance can make your motor with 1kw battery. Just interesting .

[@AntonMakesStuff]

It depends very much on the speed. I have done some speed/power measurements, I think I also wrote it in the description. For example, at 400W the boat has a speed of 5 km/h. So with a 1kWh battery that would get you around 10 km. At the highest speed, 16 km/h, the motor needs 4500W. So that would only get you 3,5 km with 1 kWh :)

[@Gergosh]

@@AntonMakesStuff thanks very helpful, do you have Instagram? Or telegram Page

[@AntonMakesStuff]

@@Gergosh No, youtube will have to do :)

[@Prototheria]

See how the water's getting aerated by the prop? That's cavitation and is being caused by overloading the blades. In short, you need a LOT more blade area.

[@AntonMakesStuff]

It's easy to think that it is cavitation, but it is actually ventilation. My construction was not air tight, and air got sucked into the propeller through the old propeller shaft/frame (there was a gap between the outboard frame and The aluminium motor mount). I eventually put some material in there to fill out the gap, and now there is no ventilation at all :)

[@kevinswanson3910]

Should have mounted the motor on top

[@scottbattaglia8595]

Oh werd? Small boat but it's also only a 5hp motor, moves pretty nice though. What type of range you get out of it on a single charge? And the original motor is on top so why not use the original 90 degree shaft and output?

[@AntonMakesStuff]

7-30 km, depending on the speed (2,5kWh battery). Yeah, why not use the original shaft and output... It certainly would have been much easier, but I wanted to try a direct drive.

[@scottbattaglia8595]

@@AntonMakesStuff respect, I mean rewired the motor and all that water proofing, and yes their would be some loss through the 90° shaft so, if feasible that's obviously more efficient. Since it's no longer gas, you should be able to fit a more aggressive propeller since you have the instant bottom end torque to move it with ease while achieving speed too, but awesome work! 🤘👍

[@AntonMakesStuff]

@@scottbattaglia8595 Yeah, the original 5 hp propeller was quite tiny compared to my 3D printed one (which is designed for 8 kW). But I think that a propeller larger than the one used in the video would be too large for 5 hp, it would just require too much torque

[@scottbattaglia8595]

@@AntonMakesStuff just do not underestimate the linear smooth torque curve you get from a gas engine to an electric motor, same as a Tesla can out 0-60 almost every super car, just don't take the new power map for granted when choosing your setup, not a naval engineer so I'm not sure propeller efficiency speed and such, I know it makes like a huge difference, in the setup, but consider you have full torque now basically from instant to full rpm, compared to a normal gas engine that has to pull rpms to start building the torque, which why I'm sure you can go bigger but in what effect as far as design will that benefit, I'm not an expert, but either larger or heavier since you have that instant torque from start, or be it a more aggressive pitch, but regardless with the extra instant torque should definitely have room for lots of improvement, wish there was a good source where someone did some data, it's a great project though, so many outboards old 2 strokes waiting to die, and a simple electric motor swap could breathe a lot of life back into the boating industry, it's slowed down so much since the early 2000's......but super awesome project!👍

[@AntonMakesStuff]

@@scottbattaglia8595 I see what you are trying to say, but the boat performance (speed) is not limited by the torque but by the power of the motor. And the power of an electric motor and a gas engine is equal, if they have the same power.

[@ugetridofit]

Seems like a whole lot of work to submerge the motor, when you could have just coupled it to the old engine shaft & and used the old propeller. Next time use varnish instead of epoxy. Its the same thing used on the magnet wire to seal it.

[@alkaholic4848]

Why can't the manufacturers make something simple and effective like this! Why are the only commercial options available crappy underpowered 1hp or less, claiming to be 3hp when they're not even remotely close, with a proprietary battery slapped on top of the outboard so all the weight is in the wrong place, and costing well over twice as much as a (much faster) petrol outboard (and that's before you even get to the cost of the batteries!).

[@stefangabler3469]

Anton, you are hopefully not saying gas motors are defective by design?😉

[@AntonMakesStuff]

Nah, they are great for a lot of stuff :) I actually gave the defective motor away to a guy that wanted to restore it, so hopefully it runs now!

[@jonwallace7015]

Quantos hp

[@zaprodk]

No details on battery pack?

[@AntonMakesStuff]

2,5 kWh Li ion battery made from 18650 cells. There is more info in the description and other comments :)

[@zaprodk]

@@AntonMakesStuff yes, but I would love to see pictures. Is the battery pack inside the old motor housing?

[@AntonMakesStuff]

@@zaprodk I don't have enough material on the battery to make a good video, maybe I can make an album or something and share it though google Drive. I'll think about it :)

[@BirdbrainEngineer]

I think you shouldn't sand neodymium magnets... ever. Neodymium magnets are notorious for rusting into dust if they get damage to their coating and then get exposed to any water... very quickly, too. Try removing material only from stator side next time.

[@AntonMakesStuff]

Yep... the "magnet material" seems to corrode very quickly

[@felixgarcianazco9496]

1600W ES ALGO MAS DE 2 HP

[@andrzejbarankiewicz4690]

let;s build electric line 220V between Yours islands then connect with and install engine 500kwh

[@georgblennow3174]

Nice project! I would suggest sanding the propeller thouugh. However this is souly based on watching this: kzbin.info/www/bejne/l6O3fZulbZubq7M

[@AntonMakesStuff]

Thanks! I did sand my propeller, however there are still some "unevenness". But I don't think it matters as much for a large propeller (but that is just a wild guess...)

[@jonwallace7015]

Im Germany.