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Re: Boat motor

Posted: Tue Jun 24, 2008 3:36 pm
by Deddly
Deker wrote:Hi Deddly.

Geeky, I have one similar to yours, it is series wound, is the one you have series wound ?
If it is, then reversing would be a problem, probably impossible.

Reversing is great to have but I'm pretty sure I can live without it. Very rarely is a reverse gear used on a boat, and if you need it then you're going too fast ;o) I could probably just spin the whole rig around if I need to go backwards, it shouldn't be too much trouble.

Deker wrote:Do you have what we call in England "Fairgrounds"

I am asking this to give you some advice on how to find an economical method of controlling the motor Geekygrilli has, assuming you have his motor.


Yep we have fairgrounds. I'd be interested to hear what you have in mind.


Posted: Wed Jun 25, 2008 12:36 am
by Deker
Hi Ed.

An economical way to control a DC motor, especially the type Geekygrilli has.

A multi point contactor with resistors.

If you can chat up a fairground fun ride operator/s who is using the old type controller/s ask them nicely if he/she would let you have a good look of how the device is made.

If they know their stuff they will know the voltage and the maximum current the machine draws.

Have a good look at the resistance wires to see its thickness. And how long.

You will see how easy it is to make this type of controller.

I made this type of "Soft Start" controller for one of my projects, it worked reasonably well.

Any Qs just ask.


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Posted: Mon Sep 08, 2008 7:47 am
by Deddly
Thanks for all the help and links so far! I just thought I'd post a little update.

So far I haven't been able to progress much on the actual building front, HOWEVER, I have met with some success on sourcing parts:

I managed to find a Chrystler 9.5hp outboard motor with a long rig, propellor still attached at the local scrapyard, which I bought for the aluminium price - nice! Actually it looks in such good condition I suspect that there's not much wrong with it and I'm going to try and get it running - in which case I'll try and build some kind of hybrid instead of pure electric.

I've managed to get, not one, but three motors! They come from lawnmovers and I don't know exactly how powerful they are (can't see any information printed on them apart from voltage. So now I have 2@24V and 1@12V electric motors. I have a friend with the equipment to test the rpm, watts etc so I'll post when I know more details and maybe someone can help me work out what kind of gearing I'll need?? They cost me 300SEK which is about £25 for all three and he threw in some jumper leads and a nice plactic bucket to carry them in :wink:

On the way back from picking them up, we stopped by a yard sale and amongst all the pots and pans and crockery etc, there stood two large propellors about a foot accross. The asking price? 50SEK each - £4! Now these are the kinds of prices I'm talking about when I say I'm on a "low budget..." I took them both, of course :D My idea being that, since it's a largish heavyish "boat" I'm pushing, it would be good to have a big prop/low revs with the electric motor instead of the high revs/small prop that most seem to have - that should give me much more torque and pulling power.

I hope to start putting things together soon...