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Old 08 August 2012, 07:29   #21
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Quote:
Originally Posted by willk View Post
Nasher has got his theory mixed up. The theory is that you "lose" about 50-60% of the SECOND engine's HP, not them both. It doesn't always work out quite as simple as that, but it's a good starting point.

.
That's a new one on me, I've always understood it as I put it.
Mind you, I've never been one to shy away from any excuse to add extra HP

Nasher.
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Old 08 August 2012, 18:49   #22
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Originally Posted by Nasher View Post
That's a new one on me, I've always understood it as I put it.
Mind you, I've never been one to shy away from any excuse to add extra HP

Nasher.
I've always understood it was loose 1/3rd of the total (which fits with Willks rule of thumb). But then 9d280 will be along to point out that the gearbox on those 90s is quite narrow and the drag rules will not apply (search to see his previous posts!).

I'd have thought speed was similar to a standard Pac22 (140 HP version, tops out mid 20's?). But obviously the fuel bill might not be so good. A wheelhouse might be a nice feature in the North Sea.
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Old 09 August 2012, 03:22   #23
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Originally Posted by Poly View Post
I've always understood it was loose 1/3rd of the total (which fits with Willks rule of thumb). But then 9d280 will be along to point out that the gearbox on those 90s is quite narrow and the drag rules will not apply (search to see his previous posts!).
And also that those 2 stroke yams have far more torquey grunt than an equivalent 4 stroke
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