Use whatever power you feel necessary.
Use a VFD, and a 3-phase motor.
OR, alternatively, the engine and control electronics from any manfacturers electric car.
These will be powerful, run at 100% output forever, and are cheap.
Costs are the same, practically.
A 5,10, and 100 Hp 3-phase motor all cost 1000-3000$.
(Surpluscenter is a good exampe of online pricing. Same prices are availabel everywhere).
A VFD is 500-1500$, weather its 5 kW or 100 kW.
The problem with VFDs is you need an inverter to deliver 220V or 380 V.
The electric car/scooter/motorbike controllers already include one.
If a small engine is sufficient, electric scooter/motorbike kits are really cheap, in the 10Hp and under sizes.
Look for the right transmission, and make sure it will not overheat.
I believe sternwheelers run really slow in termns of RPM ?
So the challenge will be the right transmission.
Chain is cheap, but must be sealed against finger etc. intrusion, and corrosion protection.
Industrial outfits will deliver cheap gears and chains.
If you are in the UK, cross and morse, hp gears etc.
Marine needs are for 5x the same robustness as in cars (maybe 2x for sternwheeler not in open seas).
So a 5 Hp car engine needs a 25 hp transmission.
Or a 1" chain, at a ballpark.
All industrial gears suppliers supply charts.
Pick the power and rpm and you will see what chain/gear/timing belt can deliver the required power.
Derate by 0.9.
Specific advice requires HP and mass and usage numbers.
Compare to other peoples sternwheelers for sanity check.
We're in the middle of building a glorified barrel barge, sternwheeler, made of mostly recycled and repurposed materials and driven by an electric paddlewheel. Would love it if you guys would comment and maybe offer some advice, particularly on a decent drive motor for the thing.
Blog is at floatingempire.blogspot.com
-- -hanermo (cnc designs)
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