From: Murray
[Murray@argusheating.co.nz]
Sent: Wednesday, 25 March 2009 9:47 a.m.
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Cc: andy landy; luc dubois; stefano sirri; John Goldsmith; thomas
paasch; pieterjan dwarhuis
Subject: RE: AW: IACA Ballot on hydrofoils
Attachments: A class with bent cboards.JPG
Hi All
Our president has already stated that a
small amount of lift is acceptable.
By taking the extreme view that all canted
and curved foils need to be banned is as unacceptable, as is the proposed ballot
of open development of hydrofoils (with two small restrictions).
There is always some middle ground for
rules. By extending the present under water width to 1.75 m curved and straight
boards would be on equal terms.
The photo attached is of an A class in
medium winds and is half out of the water on curved foils.
Boats flying completely around the whole
course may be impossible but substantial lift can be generated and a strong
advantage gained when the right conditions present themselves.
Is it faster? Vote yes and we will find
out. Vote no and the committee will have to look at the issue again.
I am not a lawyer but the meaning of rule
I is different if you use the whole rule and not just a part of it
rule 1: "A
catamaran is defined as a two-hulled sailing boat with essentially duplicate or
mirror image hulls, fixed in parallel positions"
Rule only talks but hulls not other parts
of the boat. As it’s an open class any if its not specifically banned then you
can use it.
I know of at least 4 people that have
rudders that attach from the bottom, and three that slide them in from the rear
are these legal? No I think not?
It has also been pointed out to me that
the hull finishes at the transom so it’s impossible to insert a rudder. Rudders
are not inserted but attached, as they are still movable hull appendages they
may be illegal under new rule.
To throw a quote back at you mike
What does a measurer do when someone turns
up to a regatta with inserted rudders and a protest flag? It will be a mess.
The problem with new rules is that of the
literal interpretation of the word, inserted has a defined meaning.
I have been asked if Multiple foils are ok
ie have a number of foils on the boat and insert them for different
conditions or even have multiple centreboard slots each for a different leg of
the course or type of foil.
Sounds legal to me under the new rule.
Also sounds complicated, time will tell if
its faster.
Cheers
From:
Sent: Tuesday, 24 March 2009 20:45
To:
Cc: 'andy landy'; 'luc dubois'; 'stefano sirri'; 'John Goldsmith';
'thomas paasch'; 'pieterjan dwarhuis'
Subject: RE: AW: IACA Ballot on hydrofoils
Hi,
I think
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 :)
"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
- 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