----- Original Message -----

From: Doug Haines

To: harryproa@yahoogroups.com.au

Sent: Monday, April 02, 2007 5:11 PM

Subject: Re: [harryproa] More musings

"Performance and ease of sailing improved markedly. Top speed was 18.5 knots and it points as high as the Tornados, although we it is not as quick upwind. "

From Rob Denney.

Single mast compared to two speed increased?

Rob Denney <proa@iinet.net.au> wrote:

 

----- Original Message -----

From: Douglas Alexander Frnk Haines

To: harryproa@yahoogroups.com.au

Sent: Sunday, April 01, 2007 7:23 PM

Subject: [harryproa] More musings

First off, I was enjoying having two nice hobies coming by when I
noticed that I had veered towards the channel marker. Steering either
way didn't do much and the pointy green starboard marker made a nice
foot long rip hal way up the forward sail.
Nevermind.

I've realised that some of Rob's comments apply to his own plans for
sailing and they differ a little from my plans. I've been seeing what
I need to cruise along the coast. Maneouvrability is a let down. The
basis of speed and long thin hull is firmly fixed, and all I can see
to steer better is moving rudders aft. I appreciate now that perhaps
Rob was looking ahead to his transpac boat and long distance racing.
It seemed easier to me to build at the time so I copied his beam
mounted rudder idea. Now I am wondering how to get them back a bit.

There is no easy way to move them aft.  You will need to get inside the lee hull to strengthen it up.  My boat steers well with a rudder on the beam, except at low speeds, when it tends to go sideways faster then it turns.  However, at low speeds, if anything is in the way. reverse the sails and go backwards for another shot.  OR, better, move your weight forward, which gives the boat something to turn around.

As for the schooner rig, well it seems sensible, lowering centre of
effort and transfering loads directly at the beams. Trying to sail it
on your own though is a diffrent matter. Now Rob (and Mark), report
speed INCREASING USING ONE SAIL. (wHAT IS A hARRYPROA WITH ONE MAST OR
SAIL? aA UNITARY). Watching both sails is confusing, especially at
high speeds, tight navigation, tired etc. I would attribute some speed
gain to accurate angling. Again I'm thinking about myself and maybe a
racing pair could work two sails (comments Rob?, eg. photos shown at
Coffs Harb).

 

Unitarry is good.  Speed does not increase with one sail which is half the size of two sails, except in big breeze.  Two sails are great, but hard work solo, particularly if the boat is not set up for it.. 

Good note, is that reducing stiffness in battens improved sail shape
today. Rudder blades also sanded/polished smoothe seem to go better
and avoid seaweed snags better, must be slipping off to the side.

Question - what is your sail luff and foot lengths going to be Rob?
And is the rope better than slugs for sail shape?

The foot will stay at 2m, not sure how much higher.  The rope is theoretiucally better (seals the gap), but for cruising, slugs are much superior as the sail can be left on the boom and does not blow around when lowered.

Hope to be down for the first multiple harryproa sailing event this weekend.

regards,

Rob

Doug

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