Re: [electricboats] advice not on sailing boat

i've been a bit distracted the past couple of weeks but have some data on the current propellor and rpm. 

I have a (odd) 400 mm diameter , 290mm prop. 
my current engine runs stationary with a propspeed of 340rpm with a speed of 3.5kmh (1.8/19.9knots) - i like to go a bit slower then that as well
at 545 rpm the speed of the boat is about 3 knots
600 rpm 3,5knots
840 rpm 4,5 knots
975 rpm 5 knots, about max speed on the engine.
i'll probably cruise around 500-700rpm 90% of the time. 
but do need to brake/manouvre and cross a big canal occasionally, so woudl like to get 900-1000 rpm sometimes.

Taking into account my attempt to keep the prop (as long as it's not against me), i was hoping to get some advice on the engine. is a used 48v dv (series wound) dc engine a possibility? I'm trying to avoid a brushless because of cost of engine and controller. 

also I thought to find an engine with a low rpm to make it work without a reduction (less elements, less costs, less noice). 

Any thoughts?

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