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

From: Rob Denney

To: harryproa@...

Sent: Sunday, August 03, 2008 1:31 PM

Subject: Re: [harryproa] Dyna rig sailing test7 shunting manuevers, beam speed, sailing triangle course

G'day,
That is seriously impressive. Well done. Definitely started me
thinking. I worry about heaving too. Not a problem on small boats,
but could be on big ones.

Could you turn the sail until it is pointing into the wind and see how
stable it is, please. If you cannot keep it aligned with the wind
will it be difficult to reef, hoist and lower as the loads on the
tracks or whatever it runs on will be high?

My second worry is the shape. I have spent a lot of time tweaking
sails for optimal shape, and it is rare for this to be draft at 50% on
the front sail, be it jib or main. However, I have tried an ogive
(section of a circle) on a two way lee board and it worked well,
apart from it's narrow angle of usefulness. This may not be a problem
on a sail which can be constantly trimmed.

Well worth a try full scale, I think.

regards,

Rob

On Sun, Aug 3, 2008 at 4:18 AM, tsstproa <bitme1234@yahoo.com> wrote:
> Sailing in winds from 12 to 14 wind puffs to 18mph.
> Also sailed easy rig when wind decreased. Big difference in shunting
> and sailing over all. The easy rig was very slow to shunt and was more
> prone to blowing a shunt due to the slow timing required to shunt the
> easy rig. Again the large swing up from old tack to new with the easy
> rig vs the dyna which is just a flick of a few degrees from one tack
> to the next . if you blow a shunt really easy to flick it back to
> regain control. Won't go back to an easy rig . Now I want to attempt a
> deep v paciific proa designed with a more 75% displacment main hull 25
> % displacment windward ama. Same scale 1/12 so a 24'' l main hull and
> a 16''l ama. I think I can get less wetted surface area and run
> free'er in the chop with the V hull.
>
> http://www.youtube.com/watch?v=fIm3DpxDzJ4
> http://www.youtube.com/watch?v=nYLkV4yOBcA
>
> Todd
>
>

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