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Old 12 December 2015, 04:51   #1
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Which leg first!

Hi
I have a 8m Ribcraft project that I am working on just now and have the option of fitting either a Bravo 2 or a Bravo 3 leg. Never tried either on the boat as it was not running when I got her. Anyone with any thoughts on which leg I should try 1st? Engine is a 230HP 4 cylinder Yanmar.
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Nessy
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Old 12 December 2015, 05:23   #2
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My guess is B3-twin contra-rotating, faster and more economic, but a more complex design.
If you use B1 or B2 you will need to off-set the leg to avoid the boat "twisting" in the air every time you jump a wave.
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Old 12 December 2015, 11:00   #3
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1 2 or 3 would probably be ok b3 will track level and give best general overall performance bravo 1 will give best out & out top end b2 probably more reliable than b3 & suited to lugging heavy loads but will be slower due to extra length and larger dia gearbox
Also if your keeping the boat in the water b3 are more prone to corrosion
In reality any would be ok on that boat with the correct ratio and prop
Yanmar is prone to turbo lag which is another consideration with the b3 as there's no initial slip to allow the turbo to spool up
I'd personally lean toward the b1 unless your lugging heavy loads as loads of prop options and props are way cheaper than b2 or 3
You don't offset sterndrives like outboards,too much work to re cut transom hole and resite engine beds
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