Subject: Re: [harryproa] Re: single rudder idea
From: "Rob Denney" <proa@iinet.net.au>
Date: 4/30/2007, 6:11 AM
To:
Reply-to:
harryproa@yahoogroups.com.au

G'day,
 
I agree it can become excessively complex, although my original system (couple of 2 x 1 bits of timber between the beams) was not, and worked well as long as the shunt went smoothly, which it always did on the little boat, but maybe won't on the 15m which will be shunted in the dark, with big seas and a tired crew, and with the bigger span between the beams on the 15m, I could not get it lighter than the 2 rudders mounted on the beams. 
 
This is what I am now using, with only one being used except in light air. The current system  is relatively simple and so far works well.     
 
regards,

Rob
----- Original Message -----
From: Phil Keck
To: harryproa@yahoogroups.com.au
Sent: Sunday, April 29, 2007 8:40 PM
Subject: Re: [harryproa] Re: single rudder idea

Agh!  This whole thing would be greatly simplified if it just became a trimaran or tacking outrigger.  I was wondering last night...is the speed increase by having a proa really that much greater over a tacking outrigger or trimaran that it justifies the increased complexity of the steering?
 
Phil

Rob Denney <proa@iinet.net.au> wrote:
G'day,
 
Apart from the steering strings falling off (easy enough to fix), the steering lines need to be loosened and tightened after the shunt is complete so that the steering assembly can be pulled all the way into it's blocks at the end of the shunt.  This needed an extra set of strings and pulleys, which, with the other problems,  made it all too complex.
 
regards,

Rob
----- Original Message -----
From: pkeck2
Sent: Saturday, April 28, 2007 2:59 AM
Subject: [harryproa] Re: single rudder idea

I just had another idea for a rudder set-up.

Look at the photo here:

http://tinyurl.com/2nhrbs

Notice that the top of the rudder case thing is big and round, kind
of like a wheel.

Imagine there's a belt or rope that goes around that big round top,
and that belt is led back to a similar big round wheel that's
attached to the middle of the windward hull.

If you were looking at the boat from the top, you would see the
leeward hull and the top of that round rudder case, and then the
windward hull with a round thing just like it, and a single belt
going around both.

The round thing at the windward hull would extend up through the
trampoline, and the tiller would attach there. You'd have 360 degree
rotation, a single rudder blade that goes back and forth end to end
for shunting, and a permanently attached tiller/tiller extension.

Problems: in the middle of a shunt, when the rudder is halfway
across, the belt would be slack and could come loose from its path
around its wheels. I think you could get around this by either
putting some type of guards around the wheels to keep the belt from
coming loose, or maybe the belt could be shock cord or something.
Also, I think the tiller motion might take some getting used to,
because you'd be pushing and pulling fore and aft instead of
laterally. Can you all see any other problems?

Any thoughts or reactions?

I drew a really quick (and spectacularly low quality) image and
uploaded it here:

http://tinyurl.com/2zagbj

If that link doesn't work, it's in the files, and titled "Rudder
Idea."

Phil

--- In harryproa@yahoogroups.com.au, Phil Keck <pkeck2@...> wrote:
>
> Interesting. I think you mentioned on the proa_file group that you
guys were working on redoing the steering stuff on el...I'm looking
forward to seeing what you come up with.
>
> Phil
>
>
> Rob Denney <proa@...> wrote:
> G'day,
>
> The tramp is cut away because it makes access to the rudders
easier. It also adds to assembly time. If (when) it is put back,
the tiller extension will poke through the ww trampoline close to the
windward hull. This keeps it captive and usable.
>
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