|Subject: Re: [harryproa] Re: Rudders on lee hull only|
|From: "Rob Denney" <email@example.com>|
|Date: 4/13/2007, 10:18 PM|
----- Original Message -----From: ToddSent: Friday, April 13, 2007 1:03 PMSubject: [harryproa] Re: Rudders on lee hull only
I was thinking your elementary was your test bed for the larger
boats. Which I thought were not designed to fly windward hull. What
are your ratio's for weight to windward I must be misunderstanding
I was curious since the trimarans would normally load leeward float
along with main hull and have the main steering on the main hull yes
I know they do have smaller stearing blades on the floats. Since
your bigger boats don't fly windward hulls and have a similar load
to what the tri has, curious to find out if it would have same input
characteristics having main steering appendages on a shorter loaded
I'm finding out with the eql model that it is more weight sensitive
with weight placed on the windward hull than the leeward hull
meaning if I place enough weight to the rear on windward hull it
will fall off the wind bear away, but both hull and float are the
same length. I have to try with the board on the windward hull minus
--- In harryproa@yahoogrou
ps.com.au, "Rob Denney" <proa@...> wrote:
> No, for the following reasons;
> 1 They would lift out of the water if the hull flew
> 2) Their drag would increase weather helm. weather helm is not a
problem on harrys so this may not be a valid reason any more.
> 3) I don't like all the weight in the windward hull, except for
racing. Racing implies lifting the ww hull, see 1.
> 4) I have had enough trouble getting lee hull rudders to work
without starting on new sets of rudder problems.
> Despite all the above, the rudders on my Elementarry are getting
closer to amidships and I drew a Little America's Cup proa with
rudders and rig in the ww hull. Huge rm (lack of rm is a problem
with these boats) but prone to windward capsize unless the crew were
> We are about to launch a 6m proa with a pretty radical approach to
windward hull steering. Keep an eye on the web page for pics and
progress. If it works (pretty big if), it will change a lot of
preconceptions about proa steering.
> ----- Original Message -----
> From: Todd
> To: harryproa@yahoogrou
> Sent: Friday, April 13, 2007 12:28 AM
> Subject: [harryproa] Rudders on lee hull
> Rob, Have you ever experimented with just the rudders on the
> Or dagger board in center on leeward hull and rudders on ends of
> windward hull?
> Or any other configuration ?
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