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[drover]

Just about completed (at last!) my first sail powered model and looking to my next project which will be my first powered model which is to be a gift for my grandson.


I have the plans for the Vosper MTB 379 by from Marine Modelling. On studying them I note the prop shafts are positioned about 30mm from the centreline and the rudders are 40mm out from the centre. Never really thought about this before but if asked I would have assumed that rudders and props would have been aligned. As I'm just on the lower end of the learning curve I am curious about this would be interested to hear an explanation of this. 

[gribeauval]

Rudders are often offset on full size boats to allow the shafts to be removed without having to remove the rudders as well.

This also works for model boats!!


Mike

[craggle]

I noticed the same thing on my Severn class lifeboat, Rudders are outboard of the prop centreline.
I too was curious so thanks for asking. 

Craig.

[canabus]

On my single engine boats I set the drive shaft to the right of the rudder looking at the stern.
This helps with prop torque with brushless motors.
The last boat, a deep vee with a Turnigy 3648-1450kv on 3S(11.8 volts) and a 40mm 2 blade prop.
Next step is to test it on a 4S (14.8 volts) and add a cheap GoPro type camera.