HI George ,
I have studied Rare Birds and Aroha's rudders in a lot of detail. (I even
helped with the fairing of Aroha's rudders) and much as I think they satisfy the
requirements, as mentioned by Rudolf, they have balance problems if only partly
down. It is possible to get round this with a curved blade but not easy and I
have other considerations due to the flare on the inside of the hull I wish to
incorporate. I was also considering sliding the rudder in side a barrel to allow
further retraction but the bearings are more expensive to get right. Torlon
balls and careful bearing surfaces are required with the larger diameter. The
kick up system could still be based on a fuse. Money aside this could be a
system that works well. --- In harryproa@..., George Kuck
<chesapeake410@...> wrote:
>
> Hello Robert ,
> I think it should be possible to have a daggerboard rudder that can kick up. 
It would work on a ruder that can rotate 270 degrees but would be a problem on
360 degree rudders.  All that is needed is a kick up dagger board case.  This is
what is used on the F32. Take a look at the F32 rudder upgrade plans.
>  http://www.f-boatmart.com/home.php?cat=255
>  
> I think the original rudder on Blind Date is a dagger board type but I do not
know if it can kick up.  What ever happened with the new rudder for Blind date
?  It should be possible to make a kick up case that the dagger board can go
through.  That would allow you to raise dagger rudder part way up for shallow
water and it can still kick up.
>  
> Rob, what type of rudder is on the current 12 M Harryproa plans, Is it a
dagger board rudder ?
>  
> Happy sailing,
> George Kuck
> Chestertown,  Md.   
>  
>  
>  
> --- On Thu, 7/9/09, Robert <cateran1949@...> wrote:
>
>
> From: Robert <cateran1949@...>
> Subject: [harryproa] Re: MODERN NAMES of things
> To: harryproa@...
> Date: Thursday, July 9, 2009, 7:33 AM
>
>
>
>
>
>
>
>
> Sounds like you've got the winter blues. You certainly have got stuck into the
rebuilding but can imagine it can seem interminable at times. I am pretty
impressed at the rate of progress.
> There is a plant biology paper on Hypolithic Cyanobacteria in the Tanami
Desert ticking away (green slime that grows under rocks living on the light that
manages to get through the quartz) but mainly I am organising some house plans
for moving back down to Eden. It is to be a mud brick house in the town so it
may cause a bit of a stir, but should be reasonably cheap and very energy
efficient. I was hoping the admiral was going to retire next March so I could
get back to being a beach bum again but she was give a promotion and decided to
hang in for another year or so. She is in the same line of business as Rob's
wife. We plan to visit Rob when he moves up to Qld and get some sailing in.
> I have not changed what I want in a Harry for a while now, but am still not
sure what what to go for in the rudders. It's is easy to have kick up or
retracting but difficult to get both. I have played around with telescopic
rudders and a shaft that moves up a little way. I have looked at rudders that
kick up by pivoting on the shaft and by the shaft letting go at the bearings.I
am tending to go for the shaft letting go at the bearings and allowing a small
amount of retraction and maybe a sacrificial tip. - In harryproa@yahoogrou
ps.com.au, Doug Haines <doha720@ > wrote:
> >
> > hi robert
> >  
> >
>
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