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Some kind soul scanned each page of Mk III, up to 1985. Read it at your peril. This is really simplified so bear with me if you have designed to the IOR Rule! I've only been exposed to it slightly. I may be cutting important corners http://www.acmenovelties.net/sailing/ior_rule/ I think the...

Having never had to subject myself to the IOR rule, why did type formed IOR racers tend to tall skinny mains and huge overlapping genoas (in the earlier days of IOR)?

The IOR really favoured big headsails and (almost) ignored mizzen sails. So it must have rated very, very low. The hull wasn't an IOR favoured shape however.