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Twin Motors in Rudder-Less Boat

Turning efficiency

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Armando Loni24/02/2010 10:14:34
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77 forum posts
64 photos
I'm considering powering my next build with twin motors -  I'd like to avoid using a rudder/rudders, since the real boat (water-jets) didn't use them.
 
I can use two ESC's with a mixer unit, such that the (contra-rotating) motors can be controlled independently via the rudder signal - from the maneuverability point of view, how efficient is this methodology in comparison with using rudder(s)?
Paul Godfrey04/03/2010 19:55:06
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163 forum posts
292 photos
Hi Armando,
 
The twin props on my Dutch Courage tug (model Slipway) are controlled by separate esc's, although I prefer not to use a mixer, but instead the 'tank control' method, whereby the left stick on my transmitter controls the left motor, and the right stick controls the right motor.  Although twin rudders are fitted, I rarely use them as the boat is highly manoeuverable with just motor control. In fact, it will easily rotate on the spot.
 
When turning right, for example,  the left stick will be in a forward position, and the right stick will need to be positioned to determine the tightness of the turn - if also forward (but less so than the left stick), the turn will be gentle. If in the neutral position (ie motor off), the turn will be tighter, and if in reverse, the turn will be tighter still.
 
If one stick is fully forward, and the other fully back, the boat will, as previously mentioned, rotate on the spot.
 
Dutch Courage has fixed Kort Nozzles, and I'm not sure if  the manoeuverability would be the same for boats without these, ie 'exposed' props.
 
Regards, Paul.

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