From: Mike Drummond [mikedrummo@gmail.com]
Sent: Tuesday, 24 March 2009 8:45 p.m.
To: 'Murray '; 'Fleur Simpkin'; daarons@dml.co.nz;
patrick.ashby@righthemisphere.com; steve@riggingshop.co.nz;
blochbm@igrin.co.nz; kerry-c@xtra.co.nz; gregcathcollins@yahoo.co.nz;
paramata1@xtra.co.nz; daveygj@clear.net.nz; Bruce.Davy@Forestresearch.co.nz;
hamish@a-class.org.nz; sales@ericksenhonda.co.nz; bmharsant@xtra.co.nz;
pyhooper@axtrix.co.nz; thekerrs@farmside.co.nz; rick@LambourneArchitects.co.nz;
john.lindsay@silverfernfarms.co.nz; boatworksnz@gmail.com; 'John & Karen
Marshall'; w.muntz@xnet.co.nz; marknissen@gmail.com; mikenorton@woosh.co.nz;
kevin.percy.electrical@xtra.co.nz; chrisnlee@xtra.co.nz; dsenn@ihug.co.nz;
clear-ridge@xtra.co.nz; fdthomson@xtra.co.nz; 'Ken and Shirls';
kitchensbykevin@xtra.co.nz; Benefieldsteve@xtra.co.nz; mncates@xtra.co.nz;
samcross@xtra.co.nz; mark.d@xtra.co.nz; zeovitnz@paradise.net.nz;
KAYEMANN@ihug.co.nz; tvcam@xnet.co.nz; dana-tenacity@usa.net; kev.mel@xtra.co.nz;
e-statics@e-statics.net; Barham@xtra.co.nz
Cc: 'andy landy'; 'luc dubois'; 'stefano sirri'; 'John Goldsmith';
'thomas paasch'; 'pieterjan dwarhuis'
Subject: RE: AW: IACA Ballot on hydrofoils
Hi,
I
think Murray and myself have similar views about the A-class direction, but we
differ on the problem and how to solve it.
The
major problem is that ANY canted centreboard or rudder produces vertical lift, therefore
it has a hydrofoil effect. If the class is serious about banning Hydrofoils
then it HAS to ban canted and curved centreboards. Otherwise, what does a
measurer do when someone turns up to a regatta with vertical boards and a
protest flag? It will be a mess.
" a. No part of each hull or
hull appendages below the waterline shall be less than 0.75 meters from the
centre line. "
This is VERY restrictive for foiling - read
Luc's technical analysis. With this rule you can foil, but the boat will be slow.
Similarly to the Canadian C-class on foils - it was half the speed upwind, and
3/4 downwind of a regular boat. The photos looked good though :)
Murray wrote:
"If you can fit the parts of the tee foil down through
the centre board case there is no reason you couldn’t assemble them back
together again under the hull. "
This is incorrect - a yacht
can't be raced in a different condition to the way it is measured.
" Fixed hydrofoils are allowed as are hydrofoils
attached only to the beams."
Hydrofoils attached to the beams arenot
allowed due to rule 1: "A catamaran is
defined as a two-hulled sailing boat..."
" If you take this literally then transom hung rudders
are not allowed as they don’t meet either criterion. "
No problem, transom hung rudders are
inserted from the top onto the gudgeons.
In summary,
- boats can't realistically fly with the
Rule 8a and this was shown at the Belmont worlds where no curved boards flew.
- the reality is the class has allowed
hydrofoils for many years now - either change the boats, or change the rule.
I'm happy to answer any questions,
regards
Mike
NZL 245