Subject: Re: [harryproa] Re: How is it on
From: Rob Denney
Date: 8/26/2011, 3:01 AM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 



On Thu, Aug 25, 2011 at 10:59 PM, bjarthur123 <bjarthur123@yahoo.com> wrote:
 

so it's bad to bear away with the aft rudder. what about heading up?


Good question.  Don't remember any difficulty on RB, certainly none on el.  


do you think it's because of the proximity of the rudders to the hull?


No, because they are so shallow.  But it does look like the high pressure wave is increased by the nearness of the hull.  No idea by how much, or even if it is.  RB is almost ready to launch, will see if we can get some photos.  


the other possibility is that the rudder is already close to stalling just maintaining a steady course, and that to bear away it stalls completely. were this the case, i would think bigger rudders would help. the reported 5-10 degree AOA is consistent with this scenario.


Agreed, and this would seem to be at least part of the Blind Date solution.   


counteracting weather helm with the front rudder can't be fast, as you'd be enhancing sideslip.

True.
rob


ben

--- In harryproa@yahoogroups.com.au, Rob Denney <harryproa@...> wrote:
> On RB turning with the rear rudder while sailing to windward in 15-20 knots
> was like putting the brakes on. Helm would load up, there would be a big
> valley on the windward side, a corresponding hill on the lee side,
> exacerbated by it's nearness to the hull, the wake width would widen and
> the boat would alter course very slowly. Lock the aft one straight ahead
> (like a daggerboard) and turn with the bow one and it would alter course
> quickly and with no fuss.


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