Subject: [harryproa] Re: Sunday sail - DID i BUILD THE WRONG RIG?!
From: "doha720" <>
Date: 11/22/2006, 2:31 AM

G'Day Rob,

Did I miss something? You are actually suggesting one mast is better
than two? I remember you saying you weren't happy with the wing mast
you were making but I took that to mean you weren't happy with the
single mast in general. I guess you were just talking about that
particular aluminium honeycomb method or was it the wing shape. Did
you get to the test sail stage with that one?
I was anticipating two masts being better performance but more
complication sailing - but I gather you found one mast good or
better even.
This is not the end of the world as the masts I made are
impractically heavy to lift in and out, and pretty lumpy/unfair
bendy so although I was going to make do for a while I wouldn't
mind doing a third mast later on.
Could you maybe summarize preferred current set up for Elementarry -
probably should change some things on the web site such as CAD
I really do need a go on your boat to understand better what I
should be working on with mine. Is this possible?


--- In, "Rob Denney" <proa@...> wrote:
> G'day,
> Went sailing on Sunday in Elementarry to assess una rigs vs
schooners. 15 knots of breeze, solo, with 11 sqm/118 sq' of sail.
This is half a Tornado sail area but the sail itself probably less
than 75% as effective due to the mast and the set up.
> Simply amazing. It is a different boat. Flies over the water
rather than trying to force it's way through it. Steered itself,
the bows were up upwind and top speed was not a lot different to the
schooner rig (16.4 knots max, vs 16.8 with the schooner in similar
conditions). Followed a Tornado upwind, was pointing as high, but
going slower. Quicker than a racing Hobie 16 reaching. Not many
other boats were sailing. Not much sea, but occasional large wakes
from powerboats. Handled with aplomb, although wet if the beam hits
the wave top.
> I steered using only the aft rudder which was similar to steering
a conventional boat, the forward location making up for no
daggerboard, the oversize rudder making up for the lack of lever
arm. Shunting was very easy (a nuisance going to leeward to lift
and lower the rudders), never got close to getting into irons or
caught aback. Downwind, it just got up and went. Occasionally
buried the bow, but did not slow it down. It is now definitely a
boat anyone could sail solo and one which I look forward to teaching
my 4 year old daughter how to sail on. Should also be able to look
at the gps while sailing, rather than only the max speed at the end
of the day.
> Interestingly, I only flew a hull once or twice the whole time
(too lazy to get off the windward hull, too amazed by how
comparatively easy it all was to bother with pushing the limits),
which suggests that the rig is under utilised, something supported
by looking at it. A new wing mast will help this. I was going to
increase the una rig sail area, but think I will go with the same
area, but with a wing mast, maybe forward raked to reduce sheet
loads. Also building a single rudder setup so I don't have to raise
and lower them each shunt.
> The single rig is quicker to rig and derig; An hour and a half
from arriving at the ramp to sailing, but at least half of this was
one off jobs that needed doing. Also easier to right after a
capsize and 4 grand cheaper.
> I am not a lot wiser about how long boats should be for a given
sail area, but am pretty certain that it is much longer than they
currently are.
> I think this was not so much a comparison between schooner and
una, more between lots of sail and less, although 2 is definitely
twice the effort of one.
> Apologies for cross posting.
> regards,
> rob

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