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Old 11 November 2010, 03:11   #41
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Originally Posted by gotchiguy View Post
A 250HO will always go faster on the same hull than a 250, otherwise the HO brand would be redundant.
Careful Olly, you're digging pits for yourself again. There's a lot more to speed than pure hp. Propping, weight and the skill of the helm for three.

Otherwise, how do you explain Jim passing you on Alderney?
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Old 11 November 2010, 04:23   #42
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Just to muddy the water a tad more, the ICOMIA standards for engine rating allow for a +/-10% variation on stated rating, so a 100hp engine could be anything from 90-110hp. Obviously the bigger the engine the wider the absolute variation could be, e.g a 200hp could be 180-220hp. This explains why we get "weak" & "strong" engines.
And of course sometime around the mid 70s they decided to make it vaguely ungnentlemanly to quote crank horsepower rather than prop horsepower (which may explain some of the weird numbers of the time......)

Did Yam (?) not sell a 9.9 to get round some insurance / driving test / other ransdom EU directive thing that used the phrase "10 or more horsepower"?


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Hmm, you've obviously never been on an Etec powered boat.

Etec? My idea of a high tec 2- stroke is one that mixes its own oil & has electronic stuff to fire the sparks!
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Old 11 November 2010, 04:45   #43
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Etec? My idea of a high tec 2- stroke is one that mixes its own oil & has electronic stuff to fire the sparks!
Ahh! that's where you're going wrong
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