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Old Jan 23, 2013, 05:13 PM
ronahearn is offline
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General question Any one know the usual distance between center lat.res of IOM hull to center effort A rig sail plan
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Old Jan 23, 2013, 06:20 PM
hiljoball is offline
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I have not seen any numbers posted in the format you request.

I have seen a number of plans that show the distance from the leading edge of the fin to c/l of mast at around 20mm. Some show leading edge of fin to trailing edge of mast but it comes about about the same.

John
Old Jan 24, 2013, 03:38 AM
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Thanks FWAL,
Mr Damian Ackroyd, the builder of my design 'Shiraz' has only been moulding for a short time, but he has been working closely with David Creed for the last couple of years. We are slowly but surely getting there with this IOM.

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Last edited by john m taylor; Jan 24, 2013 at 08:30 AM.
Old Jan 24, 2013, 07:39 AM
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Quote:
Originally Posted by john m taylor View Post
Thanks FWAL,
Mr Damian Ackroyd, the builder of my design 'Shiraz' has only been moulding for a short time, but he has been working closely with David Creed for the last couple of years. We are slowly but surely getting there with this IOM.
Hey John,
I'll be up against it hopefully on Monday, Shiraz v Lunatic ( that is my boat not the skipper) yes it is 2 boats that you have sailed
Old Jan 25, 2013, 08:12 PM
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Mini Rant.

Reading various IOM forums around the world they are having heavy, and sometimes heated, discussions about; sail numbers, how to call sail numbers, colored resin, formed sails, and of course the typical rules discussion and the new version. I hope it is just winter boredom because a lot of these guys are chasing people away from IOM's.

The common thing I hear when I am trying to get someone into the class is that there are too many rules and the sailors act like snobs and sea lawyers.

The rule makers had better keep that in mind....in my opinion.
Last edited by TedFlack; Jan 28, 2013 at 08:28 AM.
Old Jan 25, 2013, 10:09 PM
Turbo2u is offline
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Quote:
Originally Posted by ronahearn View Post
General question Any one know the usual distance between center lat.res of IOM hull to center effort A rig sail plan
In theory the CLE should be directly over the CLR. In practice the sail needs to be slightly forward because the draft of the sail moves causing the CE to move back. The balance you want is, on the wind, about every ten boat lengths the jib should start to luff and you turn off a little to keep the jib trimmed.
Old Jan 26, 2013, 02:46 AM
PB88 is offline
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Grant L

V8 For Sale


V8 NZL 851 Tunzagrunt
Hull, fin with detachable bulb and rudder.
Designed by Ian Vickers
As new condition.
Can be viewed on NZRYA web site
$2300.00NZ plus freight.
Contact
lanes@slingshot.co.nz
Old Jan 26, 2013, 04:16 PM
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TED: KISS wins every time. Could not agree with you more.
Last edited by iomthinkin; Jan 26, 2013 at 04:49 PM.
Old Jan 27, 2013, 03:56 PM
PorkyPig is online now
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David Cook Victoria, BC Canada
Ron,

I had the honour to learn a bit of IOM design from a true lost sailing legend, Geoff Smale, the first Kiwi to put NZL on the world stage as awesome sailors. See pic of him proudly showing off his 9 personal designs and his red Widget.

Geoff taught me to determine the fin fore and aft positioning you match the hull CLR with 25% aft of the average chord length of the leading edge. If you have a tapered fin measure the chord length at the hull and at the top of the bulb and average those to get the average leading edge. Then take 25% of that.

Another method that Claudio came up with was put the fattest part of the fin in line with the centre of buoyancy (the fore and aft position when you add weight to the hull and the boat immerses equally).

Cheers

David
Last edited by PorkyPig; Jan 28, 2013 at 09:22 PM. Reason: forgot to include a key piece of info
Old Jan 27, 2013, 09:46 PM
D design is offline
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NORTHLAND NEW ZEALAND
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PB88 reason for sale?
Old Jan 28, 2013, 02:27 AM
ndeverell is offline
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Quote:
Originally Posted by PorkyPig View Post
Ron,

I had the honour to learn a bit of IOM design from a true lost sailing legend, Geoff Smale, the first Kiwi to put NZL on the world stage as awesome sailors. See pic of him proudly showing off his 9 personal designs and his red Widget.

Geoff taught me to determine the fin fore and aft positioning you take 25% aft of the average chord length of the leading edge. If you have a tapered fin mesure the chord length at the hull and at the top of the bulb and average those to get the average leading edge. Then take 25% of that.

Another method that Claudio came up with was put the fattest part of the fin in line with the centre of buoyancy (the fore and aft position when you add weight to the hull and the boat immerses equally).

Cheers

David
Great shot of Geoff

I new him well and he coached me with my sailing 40 years ago!
He was a person who thought everything through
fanatical l with sail shapes

cheers Neil
Old Jan 28, 2013, 03:01 AM
bigpat is offline
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Love RC Yachts!!!
Quote:
Originally Posted by TedFlack View Post
Mini Rant.

Reading various IOM forums around the world they are having heavy, and sometimes heated, discussions about; sail numbers, how to call sail numbers, colored resin, formed sails, and of course the typical rules discussion and the new version. I hope it is just winter boredom because a lot of these guys are chasing people away from IOM's.

The common thing I here when I am trying to get someone into the class is that there are too many rules and the sailors act like snobs and sea lawyers.

The rule makers had better keep that in mind....in my opinion.
Ted,

There are always people that will politicise things, whether we'll meaning or otherwise.

I believe in enjoying the sport on the water itself, and involve one deeper in the sport if you wish. I myself take a interest in the sporting and technical regs, but avoid the online politics, or criticising those who put up their hand voluntarily to help administer the sport.....
Old Jan 28, 2013, 08:48 AM
TedFlack is online now
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Quote:
Originally Posted by bigpat View Post
Ted,

There are always people that will politicise things, whether we'll meaning or otherwise.

I believe in enjoying the sport on the water itself, and involve one deeper in the sport if you wish. I myself take a interest in the sporting and technical regs, but avoid the online politics, or criticising those who put up their hand voluntarily to help administer the sport.....
I am certainly not criticizing the people that do the volunteer work, if I came off that way I apologize to all of them. They are just responding to requests made to them by NCA's and they are doing there thankless jobs.

My comment about people thinking the IOM's have too many rules is true, I just think we need to be careful about adding more.

I am retired and the water is hard where I live so the discussions on line provide me a source of reading pleasure and entertainment while I wait out the winter. I am an internet junkie so it is all good with me. But I am a hard core IOM guy and will race them no matter how many rules they have, I love these boats and the people that race them.
Old Jan 28, 2013, 02:43 PM
PB88 is offline
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Grant L
Three IOMs and a Marblehead, the boss said sell one.
Old Jan 28, 2013, 08:34 PM
BAJAN SAIL 51 is offline
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Originally Posted by PB88 View Post
Three IOMs and a Marblehead, the boss said sell one.
good reason but why the V8


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