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  1. 01-12-2019, 12:30 PM #1
    PRE-Z06
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    10% rule

    I read somewhere that it came about in the '80s because Yamaha was rating their outboards at the propshaft and other manufacturers were rating them at the crank, is that correct? I assume 10% was chosen because that's roughly the amount of parasitic loss? Is this around the same time the ISO 3046 became the standard for measurement?
    Last edited by PRE-Z06; 01-17-2019 at 08:33 AM.
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