Alastair, here is a test done several years ago and reported by Yachting Monthly magazine. Good comparative reading.
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I second the kudos for Gori props... I've only put just a few hours on mine, so admittedly that's a ridiculously small sample, but it seems like an amazing thing so far, and the previous owner sang its praises. I've already noticed way less prop walk in reverse, and the "overdrive" feature on mine (3 blade) increases efficiency quite noticeably... I did read the not-so-glowing numbers on the GORI as described in the yachtingmonthly.com article from the above post in this thread, but it was difficult to tell whether they even used the overdrive feature (read up on it if you are interested) for the tests, or whether they engaged overdrive properly at all... their brief mention of how one engages it at best vague, and more likely just plain wrong. I would have liked to have seen two sets of numbers for the Gori prop, one for "regular" pitch, and an entirely separate set of results for "overdrive" pitch.
