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owenmccall 03-12-2004 05:26 AM

Early IOR quirks
Jeff_H wrote: "They (Morgan 27s) were designed around the earliest IOR rule and have some of the quirkiness of early IOR boats."

Jeff, could you elaborate on this point? Am interested since I am considering the purchase of an early IOR boat. Thanks. (Others'' opinions welcome as well!)

Silmaril 03-12-2004 12:38 PM

Early IOR quirks
The "IOR" syndrome, is a reflection on the design results of trying to get the best performance under the racing rules of the day.

The end results were boats that had smallish mains, what were called "High Aspect" mainsails, and gigantic (in proportion) foretriangles.

Hull forms favored by the IOR rules had "Pinched" ends, especially the transom. The major flaw in the designs were a propensity to broaching. The boats would begin to heel, the rudder would become uncovered, the helm would lose bite and "Viola" a broach. This was most evident running, with the giant ''chutes up and a following sea. A helmsman needed eyes in the back of his head to watch the waves both in front and behind.

These designs also favored big muscular crew, to handle the enormous headsails, and the constant "gear changes" necessitated by driving a boat with the genoa and not the main.

Some designs were worse than others, and some even worked well, given the rules.

You can take one of these older designs and tame it, yet it will usually always be a compromise. Change the 170 - 165% genoa for a 130% and put a main on that has a larger roach. You will go slower, and not be as well balanced, but it will be less work. Also keep the spinniker in its bag on windy days with a following sea.

IMHO I always liked the look of the boats from that era, that''s why I have a ''76 One Tonner. But I also chose mine knowing the ones that worked, vs. the ones that didn''t. And I also respect the challenge that sailing her entails.

owenmccall 03-15-2004 01:38 PM

Early IOR quirks
But small mainsails do not seem to be a characteristic of early IOR boats, but rather that of the later designs, along with internal ballast and those wide flat aft sections that cause the rudder to lift out of the water upon heeling downwind. I don''t see any of those characteristics on the early IORs. I am asking about the quirks of the early IOR boats, those just after the CCA rule. Thanks.

Jeff_H 03-15-2004 05:39 PM

Early IOR quirks
When you ask about early IOR boat quirks, the small mainsail and large headsail sail plan shows up at the end of the CCA era and gets extreme by the earliest IOR boats, (look at a Tartan 41, Northstar 500, Ranger 37, Morgan 27 or Morgan One Tonner). The pinched ends and tumble home topsides show up very early as well and these lead to the wild rolling downwind rides that made these early IOR boats known thier "hold onto your hats she''s going again" broaches and round ups. The full topsides and pinched bow sections meant that as they heel, these early IOR boats tend to go bow down and aerate their rudders. IOR boats tended to be underballasted right from day one and to have comparatively high vertical centers of gravity. While some like the Tartan 41 remain as pretty reasonable boats most are pretty useless as race boats or cruisers.


owenmccall 03-16-2004 11:47 AM

Early IOR quirks
I checked out those designs you listed, Jeff, and I see what you mean. I was wrongly assuming that some less extreme versions of the IOR type-form equated with "early IOR". I mean things like a Contessa 32, Yankee 30 (Mks. I & II, not III), and Tartan 30. These would be less extreme IOR or more cruising influenced, or what, would you say? They really have a somewhat different look than those you listed, yet are of the IOR type, correct?

Jeff_H 03-16-2004 01:13 PM

Early IOR quirks
The Contessa 32 is an RORC design(Royal Offshore Racing Conference). The RORC was an earlier racing rule than the IOR. The IOR was developed by a joint international committee as an attempt to merge the RORC with the CCA rules. The Yankee 30 was a very late CCA rule design with minor changes that recognized the likely impact of the IOR rule. That makes sense since Olin Stephens was on the IOR committee and he also designed the Yankee and so knew what was coming. The Tartan 30 was a MORC design which produced much more powerful and well mannered hull forms and rigs.


owenmccall 03-16-2004 01:50 PM

Early IOR quirks
Fascinating. And since S&S also designed the Tartan 30 a family resemblance here is not unexpected, I guess. Which brings us back to the original question that I meant to ask: Do these boats we have just named possess all of the bad habits associated with the IOR typeform, or do they have a set all their own? Are they well mannered?

Jeff_H 03-16-2004 04:29 PM

Early IOR quirks
The Tartan 30 is one of my favorite boats of that era. The were well constructed and sail quite well. While I am not a fan of their rig proportions, they are still well behaved and nice sailing boats. The Contessa 32 has a pretty strong following. Compared to later designs they are pretty slow, cramped and tender but the exchange that for a comfortable motion and pretty high level of seaworthiness. I don''t know the Yankee all that well but from what I gather they did offer similar behavior to the early IOR boats that I mentioned in an earlier post.


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