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[madrob]

I need help (yet again) with a motor for my project frigate, its 75 inch long and needs a 63mm prop, anybody any sugestions on motor, geared? belt drive?

Reading a earlier thread belt drive seems the way to go but where do i get em from?

Rob

[Colin Bishop]

SHG Marine do a range of heavy duty toothed belt and pulley sets which might fit the bill.

[Shipmate60]

Try a car fan motor, these motors are designed to run for prolonged periods at different loads.
One of the easiest to get to is the Astra Blower Motor, usually about a fiver or tenner at car scrapyard.
These will run on direct drive.

Bob

[madrob]

wouldnt a car blower motor need lots of power?

[Shipmate60]

no, they are designed to run a large fan, so running a small prop allows them to get up to speed within their most efficient range.
The last one I used was just over 1 amp in air and 5 amps under load.

Bob

[wombat]

I am running a Mabuchi RS-755 bought from Pandan in my Highlander - it swings a 65mm prop direct drive with no problems - if anything it is too big for the job (scale speed in excess of 30 knots) - I am using the same motors in the Gry - they will be well OTT, but they are intrinsically slow running.

Don't worry too much about effciency, the load of swinging the prop is light compared to what these motors are designed for (for instance one application is given as circular saws), overheating is not going to be a great problem as far as I can tell

Wom

[boatmadman]

I run a buhler motor with a 60mm 4 blade prop and on 12v it pulls 0.5 amps. 

[Shipmate60]

So the 75 inch Frigate has only one shaft, wouldnt 2 be better?

Bob