[IC27A] Re: a rudder with a mind of it's own

Tue, 30 Mar 2010 11:41:37 -0700 


Hi David,
having also an outboard, going reverse is really difficult. Could you give us 
more precision on what kind of tip etc where is it placed? Do you have pictures 
or drawings?
Tks
Alec

--- In [email protected], captain...@... wrote:
>
> By experiment, I added a tip to the base of my rudder's trailing  edge.  
> Over the years, I extended that tip twice and am now satisfied with  the 
> compensation it affords my rudder pressure.  My outboard washes  directly 
> onto 
> the rudder when in reverse.  And though it dynamically  pressurizes my rudder 
> in that situation, I like it as I know it is coming and it  allows me to 
> precisely control my reversing situations.  The tip is below  the thrust of 
> my 
> outboard which has a Kort nozzle which focuses its thrust  and eliminates 
> propeller tip vortex.
>  
> David Hoyt
> Sovereignty
> Catalina 27 #65
> ahsovereignty
>  
>  
> In a message dated 3/30/2010 10:04:41 A.M. Eastern Daylight Time,  
> j...@... writes:
> 
>  
>  
>  
>  
>  
> I just can’t  resist…  Perhaps the best way to stop this problem would be 
> to cut off  the head of the rudder as in decapitation.  I am betting you 
> meant  cavitation and spell check “helped” you out. Cavitation is when 
> water 
> swirls  into a funnel and air is sucked into the prop field and instead of 
> pushing  water it is pushing air/water mix. 
> Joe  McCary 
> Aeolus  II. #4795, West River, MD 
> _www.aeoluswestriverwww._ (mip://019d1c30/www.aeoluswestriver.net)   
> joe at  photoresponse dot com
>  
>  
>  
>  
> From: ic...@yahoogroups. ic...@yahoogroups.<WB ic...@yahoo IC27On Behalf Of 
> Sneddon, Keith -  ES/IS. 
> Under power  from an inboard, the flow over the rudder is usually at a much 
> higher  velocity, and because of that plus the proximity of the prop to the 
> rudder, is  very turbulent (small scale phenomena) plus not very organized 
> as per  direction (due to swirl, capitation,etc.).  
> 
> 
> 
> 
> 
> 
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