Subject: Re: [harryproa] Re: rare bird.
From: "David Howie" <dana-tenacity@usa.net>
Date: 4/15/2009, 8:35 PM
To:
Reply-to:
harryproa@yahoogroups.com.au



Quick and dirty fix, put a 45 degree chamfer down the trailing edge of the rudder. The turbulence is flipping side to side and that's what is causing the problem, the chamfer will force it to one side and it will stay there.

Long term fix - the sides of the rudder probably aren't identical and the water has to travel a different distance on one side to the other hence turbulence. Re fair the rudder using templates to make sure the sides are exact mirror images of each other and put a knife edge back on it.


------ Original Message ------
Received: Wed, 15 Apr 2009 07:57:42 AM MDT
From: "proaskip" <skipj@oplink.net>
To: harryproa@yahoogroups.com.au
Subject: [harryproa] Re: rare bird.


I'm usually a lurker here, but there's been some things in past AYRS journals re rudder ventilation that might be worth checking.

One is a few horizonal fences on the rudder near the static water waterline. The other is to sweep the rudder forward a few degrees, this could be tricky rearranging pivot points for balance etc. but worthwhile if it keeps your rudder unventilated.

Have really enjoyed your posting of real experiences.

cheers,
Skip

--- In harryproa@yahoogroups.com.au, Doug Haines <doha720@...> wrote:
>
> i reinforce that idea, my rudders always seem to have big loads. but i still am actually trying to sort out my cavitation /ventillation whatever the turbulence off the rufdder is.
> it is so annoying to start creaming up above 10 knots and then bam its caught the roughness on the blade or something and there goes all the speed and direction untill i waggle the rudder to throw the air bubbles off.
> i am wondering what the mouting under hull would mean for this problem too.
>  
> doug
<CLIP>


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