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Old 26 July 2012, 14:37   #11
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Why the need for speed I rather be safe and comfortable
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Old 26 July 2012, 14:39   #12
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Why the need for speed I rather be safe and comfortable
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Old 26 July 2012, 15:38   #13
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Stick the other 90 on the back of the Assault, that should have the desired affect....
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Old 26 July 2012, 15:56   #14
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Stick the other 90 on the back of the Assault, that should have the desired affect....
Cheers chewy... I've just sprayed my tea up the wall!
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Old 26 July 2012, 16:01   #15
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Cheers chewy... I've just sprayed my tea up the wall!
Its ok, I aim to please
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Old 27 July 2012, 05:14   #16
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Stick the other 90 on the back of the Assault, that should have the desired affect....
I thought it, you said it.....

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Thing with twin set ups is more weight (twin batteries), seperate fuel supplies, more maintenance, etc.
It's a 2- stroke 90. Self Sustaining. One battery will start them both. I bet with no batteries he could take the lids off & pull start them both too...... Remember it's speed he's after, not total failsafe.

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you loose some power in a twin mount,
Search for my previous notes on these matters. I'm fed up typing the same thing.....
From memory 90 is about the top end of that generic gearbox size, so I guess if you replace with a 140+ the drag argument will likely reduce due to the much bigger 'box on the bigger engine, although at 50 knots the drag will be significant. Maths needs to be done!
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Old 27 July 2012, 06:10   #17
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90 Yam has a 4.25" gearcase. V6 motors have a 4.75" gearcase, so the extra drag of 2 Yam 90s compared with a single V6 200hp motor will be significant.

In terms of power:weight, a single 200 will outperform twin 90s.
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