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Old 09 April 2003, 05:45   #11
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Xcuse my ignorance, but what's a Hydradrive?
Is it the same as a waterjet?
Or how does it difer from a "normal" drive leg?
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Old 09 April 2003, 07:40   #12
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Hydradrive

Hi Brian

The Hydradrive is Yamahas gearbox basicly, just like you and me have the Bravo 3 x leg, Yamaha have the Hydradrive. Its a very smooth gearbox and runs very well.

Julian
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Old 09 April 2003, 07:50   #13
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Julian, thanks for that.

PS YOU MAY have a Bravo 3x. I now have a Bravo 1 with a 4-bladed left-handed prop.

I must say I feel a bit more confident now about running way off-shore.
There was a time when I felt I shouldn't go on any long-range cruise without taking Hot Lemon 4 along as my support boat!!
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Old 09 April 2003, 07:55   #14
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I quite sure as peper said the HydraDrive is similar to an automatic gear box in that when it engages gear it's not cogs interfering together, rather hydrolic fluid flowing through valves and things. This removes the crunch we are all so used to. I don't know any more about it than that though.

What i do know is Alan P did have problems with the unit, caused by overheating, which was, in turn, caused by poor quality fuel.

The reason - simple i guess (and i am guessing here) but don't nearly all of us have exhaust's that exit through the prop?

Poor fuel = inefficient combustion = hotter exhaust gasses per HP = boiling hydrolic fluid in said gearbox.
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Old 09 April 2003, 07:55   #15
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Performance

Brian

How does the performance compare between the Bravo 1 leg and the Bravo 3x that you used to have. I know what you mean about running ofshore on your own with the Bravo 3 leg, its a bit worrying at times, Touch wood mine is still going strong (for Now at Least ).

Julian
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Old 09 April 2003, 10:25   #16
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The Title should have read WHICH IS THE BEST STERN DRIVE, But the the other half was bending my ear, for spending hours on the internet.....

< It does now! JK >

DIRK..... Please name a few reasons why the bravo units are not suited to Yanmar engines......

It appears to me that Volvo and Yamaha are taking the lead on this thread..... then why are Yanmar/ Bravo units seem to be the most common?? Is it price???

But I think now its heading towards which leg you have, that seems the weak spot... in Diesel inboard Ribs
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Old 09 April 2003, 16:33   #17
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I believe the 300 Yanmar / Bravo 3 (x) combo is so popular cos it offers the best power to weight ratio. IIRC the KAD300 is only about 285hp whilst that Yanmar is actually about 320.

I can offer no ownership experience of outdrives but I having done lots of miles with Brian on Cyanide and being there 25nm out of Stornoway when the second B3x drive failed in a major way I would not for a moment use this combo for extended cruising in a single engined RIB. The risk of failure would be too high for my own peace of mind.

As I posted earlier, Jim Mackintosh has done 1000's of miles on his Yamaha drives and has absolute confidence in em. I'd trust his judgement and experience.

Volvo's are widely prevalent in the gin palace market so must be a reasonably reliable product. Although not cheap I hear, but then what the hell is when we are talking about big RIBS!
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Old 09 April 2003, 18:31   #18
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ok so what are the differences between the bravo 1 and 3 that render the 3 less reliable and the 1 a better choice??

i presume price has a big part to play, but what technical aspects deem this?
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Old 09 April 2003, 18:41   #19
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Quote:
Originally posted by Daniel
The reason - simple i guess (and i am guessing here) but don't nearly all of us have exhaust's that exit through the prop?

Poor fuel = inefficient combustion = hotter exhaust gasses per HP = boiling hydrolic fluid in said gearbox.
Thanks, Dan - it's confusing for people with silly names. They have problems keeping up with our simple logic
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Old 09 April 2003, 19:36   #20
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I don't understand.

The reason - simple i guess (and i am guessing here) but don't nearly all of us have exhaust's that exit through the prop?

I think you'll find that most Yanmar/3x folk expel most of their exhaust through the transom and 3x drives fail. There has to be another factor.

How does poor fuel quality increase the exhaust gas temperature?

JW.
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