Technical, Techniques, Hints, and Tips > DC Motors (Brushed) and Speed Controllers

What revs?

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croakle:
Can anybody tell me if there are any rules of thumb for motors, etc in scale boats?  I'm thinking of tugs mainly.

What is the maximum revs which should be used?  And does the max revs change as the scale changes?  Is it better to use a high revs motor with a gearbox or a low revs motor without?  Or can you use a high revs motor and control it with the ESC?

Thanks and best wishes

Julian

Shipmate60:
Depends on the size and pitch of the prop.

Bob

croakle:
Bob

The diameter is 62mm, think it should be 4 blade but not sure as drawing is not clear, need to do some research.

Is there a standard pitch?  If I ordered a 62mm from prop shop would I need to specify a pitch?

Thanks for the help.

Julian

A Model World:
Generally for tugs the pitch is fairly standard (its racing and other types that need to watch for pitch) especially on a 4 blade. As regards revs well this is a whole different ballpark as you will need an amount of torque as well this depends on the weight of the boat and what style of drive, is it just propeller or kort nozzle etc.   The all up weight is one of the key factors you will need to estimate. What is the boat called, see if anyone has done one before, if you are working to plans or a kit. You can always leave props towards the latter of fitments getting the motor/s installed is prior 
Hope this helps   

Shipmate60:
A big prop, so I hope it is in a big Model.
For power and torque I would go for a geared motor such as the MFA 6:1
OR
Mobile Marine Models do a car fan heater motor which would fit direct drive, and they do specialise in large tugs.
Or have a chat to Alistaire in Model Motors Direct, he has some good large low revving motors.
Speed will depend on size and all up weight, but the above should give you something to think about!!

Bob

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