1000w + DC motor - where to get something for my project.

#1
I'm toying with the idea of putting an electric motor in a boat I have for pootling along the canal. It's a small boat and does 4-5 knots with a 3hp seagull so I reckon 1000 to 2500w should be adequate. The seagull is terribly noisy so spoils the idea of having a quiet day out.

Starter motors are an obvious thing to look at but are not really intended for continuous running. Otherwise I can get something for about £150 but I'd rather have something second hand and salvaged - i.e cheap (so I can afford traction batteries!)

Any suggestions of where to find something? Hydraulic pump motors for tippers seemed a possibility. What else gets scrapped that has a motor in it?

Incidentally I know that:
1 I'll need a motor controller
2. The boat will have to be safe.
3. The batteries will be expensive

etc. etc. etc.
 
#4
To save all that why not just buy an electric trolling motor? run it off a good car battery,can be got in most good angling shops £150 quid
google shakespeare electric motor,
tie a rope around the seagull and toss it overboard it's more use as an anchor than it is a outboard.
 

Grumblegrunt

LE
Book Reviewer
#5
that tom tunnicliffe? boat program had a guy doing one with a super efficient motor from the states - however a washing machine motor is cheap (often free) and can run on DC or AC obviously one is faster than the other but a 12/24v one would be better

as I understand it the thinner the winding wire the lower the voltage to run it but I could be wrong on that.

I have never found aheap like they used to use on scrapheap challenge with scrapped c5's and milk floats.

starter motors will run fine but the brushes will wear out quicker, they usually fail due to brushes and oil seals from the engine.

you might find an electric boat with a gash shell.

seyvlor do a leccy motor for their inflatables but no idea if they are any good.

I can sell you some earplugs which would be cheaper :)
 
#6
that tom tunnicliffe? boat program had a guy doing one with a super efficient motor from the states - however a washing machine motor is cheap (often free) and can run on DC or AC obviously one is faster than the other but a 12/24v one would be better

as I understand it the thinner the winding wire the lower the voltage to run it but I could be wrong on that.

I have never found aheap like they used to use on scrapheap challenge with scrapped c5's and milk floats.

starter motors will run fine but the brushes will wear out quicker, they usually fail due to brushes and oil seals from the engine.

you might find an electric boat with a gash shell.

seyvlor do a leccy motor for their inflatables but no idea if they are any good.

I can sell you some earplugs which would be cheaper :)

I have a washing machine motor but am uncertain how to persuade it to draw 10 x the amps at 24 v that it does at 240.....
 
#7
What way will you be propelling the boat? if you are now using a outboard and are going to use a electric motor which will effectively be in board you will have to fit a shaft and prop...you could be opening a bag of worms with this.
 
#9
What way will you be propelling the boat? if you are now using a outboard and are going to use a electric motor which will effectively be in board you will have to fit a shaft and prop...you could be opening a bag of worms with this.
Yes it lends itself to fitting an inboard. Prop, propshaft, shaft seals and a couple of pillow blocks. That's all in hand.
 
#11
Mobility scooter motor? Haven't a clue what power they are but I'd presume that they're geared down in a scooter.

I've had a look at prices and an eBay spares or repair scooter seems the most economical method of getting one.
 

Grumblegrunt

LE
Book Reviewer
#12
try searching running a washer on 12v as the yanks appear to be doing this to run houses off PV systems. this gyu is rewiring for a lathe

1 – Acquiring the motor

there are some cheap electric scooter motors which are 200w 24v which is low enough to give you a potter speed vs time out. gear it properly so the motor isn't straining and it gets better.

and old wheel chair pack would give you a motor gears and 2 speed controller so a bigger prop could be used.

electric boat motor | eBay
 
#14
Or stick a 12/24v 4000gph bilge pump on each side of the stern. Rig them to be rotatable through 180 degrees and you'll have supreme manoevrability without the need to cut holes in your boat.

Don't know what speed you'll do but 500 litres per minute should get you somewhere.
 
#15
that tom tunnicliffe? boat program had a guy doing one with a super efficient motor from the states - however a washing machine motor is cheap (often free) and can run on DC or AC obviously one is faster than the other but a 12/24v one would be better

as I understand it the thinner the winding wire the lower the voltage to run it but I could be wrong on that.

I have never found aheap like they used to use on scrapheap challenge with scrapped c5's and milk floats.

starter motors will run fine but the brushes will wear out quicker, they usually fail due to brushes and oil seals from the engine.

you might find an electric boat with a gash shell.

seyvlor do a leccy motor for their inflatables but no idea if they are any good.

I can sell you some earplugs which would be cheaper :)
tom cunliffe - if it helps !
 
#17
Its a while since i did robotwars but you'll need dc motor controllers like the ones made by 4qd or the OSMC project.

Do not use starter motors.

Search for battlebots...they still have retailers supplying them.

We used the Bosch 750w 24v dc motor along with most on robotwars.

Sent from my GT-I9300 using Tapatalk 2
 
#20
Electric trolling outboards are widely available. They tend to be quite slow, and normally require 2 heavy 12 v batts. Your best bet is to replace your british seagull with a good quality modern outboard. Think comparing a model T ford with a modern car.

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cant argue with that!
get a japanese outboard they are all 4 stoke now, amazingly quiet and will run forever on a gallon, seagull today has nothing to commend it ,they were Always oily loud and basic.
 

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