24 or 12v truck ,car starter motor for outboard

m+m

100 µW
Joined
Nov 24, 2013
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7
I am kicking around the ideal of using a 12v car or a 24v truck starter motor to make electric outboard. I have a old 28 hp Evenrude with no power head.
I would like to get 5000 to 6000 rpm
with the outboard setup it would be easy to water cool the motor.
Any thoughts has it been tested?
I looked and didn't find any posts.
I see ebike and egocarts no outboards.
 
Starters are meant for VERY intermittent duty. Probably wont' last very long in any "continuous" use like that. Also are often large and heavy for the power you can get out of them, because they do need to handle a huge amount of power for a very very short time, and because in most of their applications weight is not a consideration.

So, yes, you could probably do it, but I wouldn't--I'd use a motor designed for continous use at the power levels you're after, that is already rated to do the RPM you want at it's output shaft (unless you want to take an efficiency hit by adding a gearbox or other reduction or ratio-changer between the motor and your existing system).
 
it will burn out, and will sraw large currents out of your batteries,

search youtube for electric outboard etc .. there are some on there, and you dont need such a high power motor to run the boat,

http://www.youtube.com/watch?v=WVQK5cc9o70
 
I'v been looking on youtube I see a lot of high $ setups. I'm trying do do it on the cheap.
What do you think this one
http://www.youtube.com/watch?v=KZPjTxOj1uA
 
angle grinder .. will run but a battery wont last long.
when i was living on the rivers, i had the use of a inverter, 12v dc to 240v ac ,,i plugged in a 60w light bulb, connected to a big leisure battery , i got just over 30 mins on a full charge,,

i dont think that any 240v from 12v setup will be any good,
 
m+m said:
What do you think this one
http://www.youtube.com/watch?v=KZPjTxOj1uA
I find it extremely noisy with the high pitched and irritating sound.
If you want it cheap and good then buy a chinese brushless DC motor
and gear it down using a belt drive, preferably a cogged belt.
There are lots of cheap BLDC controllers as well at eBay.
 
Honk said:
m+m said:
What do you think this one
http://www.youtube.com/watch?v=KZPjTxOj1uA
I find it extremely noisy with the high pitched and irritating sound.
If you want it cheap and good then buy a chinese brushless DC motor
and gear it down using a belt drive, preferably a cogged belt.
There are lots of cheap BLDC controllers as well at eBay.

on a outboard motor you dont want to gear it down, there is a reduction in the gearbox at the propeller and the only thing that might need to be changed will be the propeller for one with a different pitch and or diameter.
 
Yes, you are right. But it wont be very silent as an ICE outboard gearbox is not designed for that.
But it might be a lot quieter compared to the video that was terrible noisy!
 
Honk said:
Yes, you are right. But it wont be very silent as an ICE outboard gearbox is not designed for that.
But it might be a lot quieter compared to the video that was terrible noisy!
the one in the video is noisy because its a angle grinder, but if you use a direct drive off of a bike motor, it will be no louder than a ebike, and if it is it wont be much louder,

the gearbox on a outboard is under the water which helps to keep it quiet ,,
 
So a 24 v dc bike or scooter motor and controller most run at about 2300 to 3000 rpm and gear it up to the 5000 rpm
then work out the prop pitch.
How is this setup
http://www.thesuperkids.com/hi2hicumo.html
 
m+m said:
So a 24 v dc bike or scooter motor and controller most run at about 2300 to 3000 rpm and gear it up to the 5000 rpm
then work out the prop pitch.
How is this setup
http://www.thesuperkids.com/hi2hicumo.html

nope .. dont need to gear it up if the pitch and diameter of the prop is right,
getting different dia and pitch on a prop for a outboard will not be easy, as the pitch and dia are made for the outboard specs.

i can not help with the size of electric motor as i have not experimented with them, but u will need good torq from the motor.

what size outboard was it that u have?
 
The outboard is a 28hp Evinrude

I have this setup I was going to use on a different project
http://www.thesuperkids.com/15wabmcbr24m.html

I Iam trying to stay away from too many heavy battery on the boat
I am putting it on a 14' sailing Hobie style catamaran. I took off the trampolines and making a hard deck.
I will put up some pics when the deck is finished.
 
14foot cat ? never seen one that short,
i think that motor would power a small cat easily ,
keep the end of the crankshaft that fits onto the downshaft, then you can fit that to the motor shaft to connect the motor to the downshaft in the outboard leg ,,
the advantage of that motor is the voltage range 24v upto 72v with a adjustable controller , so if 24v wont turn the prop then you can step up the battery power.
 
been thinking on this, i think that a 28hp with electric motor will be to heavy on the rear of a 14" cat , it would be to heavy for a 14" rowing boat,

i think you would be better off with a outboard around 4hp to 6hp.
 
Some of the 14' inflatable mini cats claim 50 hp outboard is max power
http://lanyuyacht.en.alibaba.com/product/285372550-200231527/high_speed_boat_motor_boat_inflatable_catamaran.html
The only reason Im going with the 28 hp is that's what I have setting around.
 
if you really wanna do it cheap and think the starter motor is cheapest then you should try that and let us know. i can buy a hub motor cheaper than a starter though but you may have a starter in your junk.
 
http://www.thesuperkids.com/15wabmcbr24m.html

With this motor and controller what else will i need to make it work properly.
Is there a good wire diegram some where on the forum.
 
Automotive starter motors (and rewound automotive generator motors) have powered boats for about 80 years.
They are mostly brushed, they get real hot, and they wear brushes quickly. They work well as low-speed applications and thus are commonly called "trolling motors".

The gears and prop from the lower leg of a 28hp Evinrude are likely matched to a 28hp 2-Stroke power curve.
So, to answer to OP's original question is , Yes you can put a 24V or 24V starter motor on that outboard leg. No, it will NOT go very fast --- or very far. It will make fun-time experiment as a trolling motor.
{A little caution about that hillbillies' engineering on Youtube, well those frankenmotors often only last as long as the video clip...then they are trash}
Here is recent example from fleabay that has worked for decades. Albiet I wager it worked slowly.... :wink:
$(KGrHqNHJEoFEyFuTqpDBS(HlHcD8!~~60_58.JPG
 
that looks like an old DC generator, not a starter. but it solves the problem of how to connect the shaft to the motor which i thought was gonna be a big problem with the starter.
 
dnmun said:
that looks like an old DC generator, not a starter. but it solves the problem of how to connect the shaft to the motor which i thought was gonna be a big problem with the starter.
I admit I can't tell many antique automotive/truck/boat/tractor starters from some antique automotive/truck/boat/tractor generators ... and I have been messing with them for decades!
Problem is that the casings for Delco-Remy , Ford , and others sometimes used the same upper case for the starter as the generator ... but that is wandering Off Topic.

OT---- usually the top "drive shaft" of the outboards' lower leg will be splined. That spline will not usually fit directly to the starter/generator so a simple hack-saw cut and a coupling , or a "notching" with a drift pin is used to merge the power train. The drift pin is "sacrificial" so that it protects the prop and drive-shaft from breaking, or the motor from stalling if an object jams it.
Early DIY and small workshop starter/generator boat motors had drive-shafts that were sometimes just a simple cable in a tube housing (zerk fitting to grease it!), others were a shaft with 2 bevel gears in an "L" configuration to the prop.
 
i think this thread will be interesting to you m8

http://endless-sphere.com/forums/viewtopic.php?f=39&t=53697


[youtube]_EV2qq2-Lck[/youtube]

and then some real motivation

[youtube]A-6NHM5DJYw[/youtube]


[youtube]QYR_sgHDU-4[/youtube]
 
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