[MHml] the Pardey way

Sun Feb 1 20:30:15 EST 2009

I have just over in New Zealand racing in a classic yacht regatta (my
brother has not yet seen the light and in fact owns four NZ Kauri classic
yachts ranging in length from 24--41'--which I have to say are beautiful.
He lives on an Island north of Auckland and has the time to maintain them
all!).  While it was great sailing and a fantastic regatta, getting excited
about 7.2 knots was a bit difficult! After we got both boats back to the
Island, Lin and Larry Pardey are his neighbours and I got a chance to look
over Taliesen and talk to Lin Pardy  about their ideas.  While obviously not
a multihull, their thinking is amazing and some of it could be applied to
any boat.
The boat is beautifully built and is so extraordinarily simple yet
completely functional and practical.
Taliesen, at 30 odd feet is still completely with out a motor and only
recently has had anything electrical on board (still only a small stereo and
a handheld GPS) her simplicity is at such a level that it must have taken
huge amounts of thinking to get there.  Nothing is wasted and everything has
a purpose--if not two!
She essentially has no cockpit, they thought putting one in was going to
compromise strength.  Below where the cockpit is, is a work bench with a
hatch above it that when removed gives full standing room for working at the
bench.  There is also storage area for bikes and water tanks.  
The simplicity continues, I noticed the water tap hanging off the deck liner
and figured there had to be a pump to get the water from the tank.. Oh no!
They have a day tank which gravity feeds the tap which is hand filled with a
jug when needed from the main water tanks aft so that they know exactly how
much water is being used.  
Everything fits and has a purpose, there is nothing superfluous nor
un-needed.  As you go down the companion way, look twice at them and you
realise that the bottom is a brilliant wooden bath, the loo is just a
bucket, but there is a huge wine locker in the bilge and the most amazing
swing down locker holding half a dozen champagne glasses, which have only
broken once off Cape Horn. The icebox is large with huge amounts of
foil/foam/foil/foam insulation and has movable wooden dividers as well as
small stainless trays that slide in and out for crushable things.  Instead
of narrow and deep it is wide and reasonably shallow, Lin said the longest
they had had ice for was 19 days on one passage.  The main saloon has
brilliantly well set up sea berths and a wonderful island double in the bow
for when they are in port.  The boat is not lined except for the ceiling, so
you see right through to the hull planking which is varnished.
Everything is solid wood, there is one piece of plywood which is part of the
top of the icebox--that's it.  So I would assume that carbon pre-preg is
probably out as well!
There is a permanently set up stern anchor and a very large hand windlass on
the bow using both chain and rope, I've forgotten how many anchors they have
but there are at least two on the bow and one on the stern.
The boat is very manoeuvrable for short tacking and has oars for rowing.
All the lights are oil/kero including the nav lights.
While I am not converted to the mono life, I love the simplicity of the
boat, there are no engine(s)/pumps/batteries/electrics/nav gear (not even a
GPS until very recently) to go wrong.  I guess the worst is if the mast
breaks, not sure what they would do in that situation--I'm sure they would
have a back up plan.  With the work bench Larry is a very skilled boat
builder so would be able to fix most stuff.  
Don't think I will go quite as far as they have with my boat, but you've got
to admire what they have done, the skill involved and the thinking behind it
and, the lack of hassle and expense of things going wrong.   BTW, I didn't
tell them I sailed multis just in case I was escorted off!

 Phil

-----Original Message-----
From: multihulls-bounces at steamradio.com
[mailto:multihulls-bounces at steamradio.com] On Behalf Of Dan Frenette
Sent: Thursday, 29 January 2009 7:23 AM
To: Informed discussion of multihull issues
Subject: Re: [MHml] Tandem "keels"

What do they hope to gain here?  It's pretty text book that the second 
blade adds to the drag aka lift/drag has some problems.

There has been some ideas over time to deal with drag from the tip but 
you can't taper the board shape in a dagger board trunk.  That is you 
normally want to bring it all the way up so say you drop in the sand 
over night causes no problem.

I've tried end plate on a dagger board but that would require a boat 
with very limited rocker in the hull shape or loss to drag big time read 
on a day the boat should go 14 knot we measured only 9 knots.  The test 
was on an over sized end plat and a flat end plat should bend under 
these loads but result were real.

In the case of a cat fling a hull you effectively have only 1 board in 
the water at a time.

On a mono you get a boat that sits on the mud flat but this isn't a 
problem with most multihulls.

On a tri moving the boards to the outside increases very short cabin 
space but as the boat gets much over 30' you have some options where 
maybe you don't loss so much.

If you're building a cruiser a low aspect daggerboard will do a lot of 
good with limited drag increase.  I was looking at the swing board 
trunks in a sharpe last weekend.  Having no vertical serface would be 
really nice in waters where you have a lot of new kelp growth. Always 
having a clean board will be less drag than the most high tech board if 
you're running short crew or other reason you can't run constant kelp 
drills.

Dan Frenette

Gary Pearce wrote:
> I previously pointed out this boat:
>
> http://www.defline.com/gammes/serie/Av43s/aventura_43_space.htm
>
> Sadly this site is all in French, and often uses words with which I  
> (and all the French dictionaries I can find) fail to include but you  
> can get the general idea.
>
> This chap has quite a bit of experience with tandem keels such as here:
>
> http://www.defline.com/gammes/one-off/D43qt/defline_43qt.htm
> (which appears to owe a bit to Mr Collins although the general idea  
> far predates that)
>
>
> Is there data as to the efficiency of this design ? I understand that  
> the leeway angle effectively means that the rear foil does not operate  
> in the downwash of the front, but am curious about the overall  
> efficiency of two shallow foils versus one long one.
>
> Whats the "price" ?
>
> Just Curious
>
> Gary
>
>
>
>
>
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