[PCW] MCAT 88' (brian eiland)

[brian eiland]

Hello John,

I saw this posting originally on Yachtforums.com , but there seems to be
very little discussion of it there.

So I put it on BoatDesign.net forums and got a little more:

Would you like to post this same message of yours onto the BoatDesign.net
subject thread?...or I could do it for you if you wish? I think it would
be better if you did it.
http://boatdesign. net/forums/showthread.php?t=19143

BTW, How are your projects coming along??

I just got out of the hospital where I had my hip surgery redone. The
first one was faulty, but I feel real good about this one....done right,
and I am recovering amazingly fast...might even be off crutches in only
three weeks.

Ciao, Brian

------ Original Message ------
Received: Mon, 03 Sep 2007 07:53:58 AM EDT
From: "John Winter" <john at adventurebay.co.nz>
To: <power-catamaran at lists.samurai.com>
Subject: [PCW] H2X YACHTS: MCAT 88' (brian eiland)

  H2X: Wow, what French flair! I just love what they do with accents!
  We built an 86 footer 4 years ago (Pacific Harmony
  http://www.adventurebay.co.nz/pacificharmony.htm ) so I'll throw in a
  few
  views to fire up some wake up discussion.
  Impressive colour scheme and very daring to go Waterjets on what
  looks to be
  a displacement hull converted for the jets. Still looks to be
  squatting in
  the running shots however. Tunnel clearance shortage gives away what
  looks
  to be a little of a weight problem. Watch out for an attempt at a set
  of
  foil fixes to get lift and send her up and away along with some hard
  chine
  add-ons.
  Our full displacement canoe body 86 x 28 footer turned out around 60
  tons VS
  74 tons for their 84x34 footer and we thought we were heavy. Their
  designer
  states 64 on his site and the builder 74 on his so it is 10 tons
  overweight
  which is an issue, even with its beamy hulls. We still managed 25kts
  on half
  the power- Caterpillar 800hp/side despite design suggestions of 28
  which I
  have since learned are a little out of reach on canoe body pure
  displacement
  hulls of most lengths. Our speed to power performance I rated as
  quite good
  for multi's this size but I was never happy with the super skinny
  hulls and
  zero space engine rooms. Sliding underneath a hot engine mid-Pacific
  to
  reach the other end for an alternator repair was not my idea of
  serviceable.
  The bilge oil helped lubricate my 85kg frame up there but removing
  the
  alternator with it jammed in your stomach on an 86 footer has to be
  questioned! I since learned other designers were getting the same
  figures as
  us with generous hull width, walk around engines, and less blue water
  pitching. Hence our new boat has widened up considerably. I also gave
  up on
  the double barrel tunnel effect, 2 much smooth area and a cupping
  effect
  when trapping the waves. Nic De Waal and Peter Brady's theory looks
  sensible
  now with hard chine multi-ridge tunnels to break up the spray. Nic's
  hulls
  certainly turn the roughest water into toast (with honey!)
  JETS: With the H2X, MAN 1300cv'S they would probably have liked 5
  more
  knots, and on a foil assisted planing hull they would have got it
  with very
  little difference under 10kt in fuel. If you are throwing over 3000hp
  in a
  boat, you wouldn't be concerned over a few litres per hour extra fuel
  at 10
  kts. Range figures on the builder site are around 1/3 the Yacht Forum
  site
  posted and lower than I'd expect in this power-rig, 1000 miles with
  7000
  litres at 10kts. (30 kts- here to the first tanker?)
  Jets are always going to give poor economy in the 10-20 range but
  usually
  quite good performance over 25, unbeatable over 35 if you have the
  right
  hull shape- lifting on foils with reduced drag to let her fly. Under
  10kts
  foil/jet powercat owners tell me they are still quite good,
  especially on
  one engine (no prop drag) so the above numbers don't quite stack up.
  The attraction of ultimate anchoring spots in shallow waters and
  unlimited
  docking moves give the jets a strong argument if you like a fast
  cruise
  speed. We are staying with displacement/shafts on our next cat and
  then
  going foil-planing/jets the following one for some white knuckle
  passagemaking. (The kids have to be a little older first!)
  Don't you just love the creativity of the French Interiors? Island
  berths
  for the guests on this size would be nice but usually island guest
  berths
  need to creep across the wing deck and make a multi-level interior,
  some
  don't like that. The chic interior design really looks sharp!
  (Perhaps a
  little sharp if you land on it one rough day) Style is all about
  minimalism
  and square these days.
  John Winter
  www.adventurebaypowercats.com
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