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Rudder....offset or behind the prop??

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Old 06-23-2007 | 01:43 AM
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From: North Shore City, NEW ZEALAND
Default Rudder....offset or behind the prop??

As some of you are aware I am building a rigger based an Antonios design.
The plans call for a single offset rudder on the right as per most rigger set-ups.
As this is a play and development boat for me I am looking for symetrical turning ability
I will fit turn fins on both sides if this idea is a go ahead.
Does the off-set rudder allow for a better turn one way.

Bearing in mind I am looking for a nice tall rooster tail, would putting the rudder in line with the prop affect this a lot, I see that some of the Octura "strudder" units are set up this way.

So after all that, the QUESTION !!
Do I put the rudder off-set and why?
Old 06-23-2007 | 01:54 AM
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Default RE: Rudder....offset or behind the prop??

I believe that a rigger will not have symetrical turning ability regardless of rudder position. I'm sure a more experienced rigger owner will give a more detailed answer.
Old 06-23-2007 | 02:31 AM
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Default RE: Rudder....offset or behind the prop??

im not a pro but i think if you fit a turn fin on both sides thats gonna cause probs? theyre hooked or shaped to hold the boat into the water for turning in one direction- at least mine is(just a visual copy of the micro renegade)
when you turn it keeps it anchored into the water and thats why when you turn the other way it actually lifts it out of the water
regards the rudder side-on the renegade its fitted on the left! (from the rear) but i have no idea if that makes any difference to the handling sorry!
good luck with your build

Graham
Old 06-23-2007 | 02:38 AM
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Default RE: Rudder....offset or behind the prop??


ORIGINAL: mrfixitwhite

when you turn the other way it actually lifts it out of the water
Now I can see that as a brown trousers moment !! [X(]
ORIGINAL: mrfixitwhite
the rudder side-on the renegade its fitted on the left! (from the rear)
Graham
Now that raises an interesting point.
Why are some rigger rudders on the left and some on the right??

Old 06-23-2007 | 05:21 AM
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Default RE: Rudder....offset or behind the prop??


ORIGINAL: Simon.O.


ORIGINAL: mrfixitwhite

when you turn the other way it actually lifts it out of the water
Now I can see that as a brown trousers moment !! [X(]
ORIGINAL: mrfixitwhite
the rudder side-on the renegade its fitted on the left! (from the rear)
Graham
Now that raises an interesting point.
Why are some rigger rudders on the left and some on the right??

Two angled turnfins is indeed a recipy for disaster, or a brown trousers moment, as you called it.
But as it's a learning project, go ahead and mount them, and see hat happens when you try to turn at full speed, make a video, so we all can learn.

The main reason for an offset rudder is the fact that it can be smaller, as it stands in a clear undisturbed waterflow.
Smaller means less drag. Left or right doesn't make a lot of difference in my experience.

Regards, Jan.

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