Hi everyone!

I´m currently building a boat model, and I have an idea that this model should not drain batteries for lights and other functions! I will have a small modelengine(Homebuilt 6 cyl.) in the engineroom that will drive a generator for this powersupply!
And my problem is, how to make a generator!! Can I modify a electric motor for this use?
The poweroutput must be 6 V.....

How do I do????

Regards Runar

Oy.... umm... I'm going to recommend you go over to rcgroups.com and start up an account over there and ask for help in the motor design forum. There are numerous electrical engineers and experienced modelers that frequent that area. It's an excellent resource. Considering you have the ability to make such an exotic motor (wow), you may be in the position to build your own. There's a manufacturer in the US that makes a steam driven generator, you can probably get help on finding that here, go to the boats general topic discussion forum.

An brush type motor,driven, is a generator. I have one I bought about 10 yrs ago made by Tetra called Dynastar AP-3 so I don't know whether they're still in business. This one has a regulator that regulates to 5.3 volts. Just for a test, stick a speed 400 motor in your drill press and see what it puts out

The brushless ones will work as alternators, just connect the leads to a 3-phase full wave bridge rectifier to convert the AC into DC. Voltage will depend on the RPM and the KV rating of the motor. For example, a 1000 KV motor will have to be turned 1000 rpm to generate 1 volt, 6000 rpm to generate 6 volts.

If you only need to power lights, there is no need to convert the AC to DC, just hook the lights up between any two of the three leads.