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Old 07 January 2005, 08:15   #1
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Amazing new volvo drive system???

Inboard Performance System as Volvo call it - not too many details on it yet but supposed to be much more efficient.

Haven't had a chance to study it yet but am I right in thinking it normally runs with the props PULLING rather than thrusting???
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Old 07 January 2005, 08:24   #2
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all in mby this month
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Old 07 January 2005, 08:49   #3
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It annoys me just how hard it is to get hold of MBY - all the supermarkets sell the yachting mags but never the powerboat ones!!!
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Old 07 January 2005, 09:14   #4
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I just did a Google search and whilst I didn't find anything about the new Volvo, I did find this which is quite old (2001) but very interesting. I guess those of you who regularly read all the marine mags from cover to cover will know about these things anyway, but to a boat novice like me it was informative and not too techie! The bits I found particularly interesting were the 'Inside outboard idea' on page 5, the 'hydraulically shifted continuously variable recreational drive propeller' on page 8 and the statement that 'Stingray' provide their cutomers with 'personalised websites' giving them access to the relevant online manuals. Oh yeah: here's what I'm talking about: http://www.rbbi.com/white/drives/drives2.pdf
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Old 07 January 2005, 09:18   #5
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Quote:
Originally Posted by codprawn
Haven't had a chance to study it yet but am I right in thinking it normally runs with the props PULLING rather than thrusting???
The props on the Queen Mary 2 are pullers rather than pushers. Also she dooesn't have rudders, rather the props are on pods rather like the lower end of an outboard.
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Old 07 January 2005, 09:21   #6
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Done another search and found an interesting article about the Volvo and yes, Codprawn, sounds like the props pull rather than thrust. http://www.ybw.com/auto/newsdesk/200...42mbynews.html

Edit: Dunno if I like the sound of this bit but presumably they've done their homework! "In the high-speed scenario, the leg and pod will shear off flush with the hull. The lower bearing carrier has been engineered specially to break at a point below the O-ring seal between the fixed and steerable parts of the drive. As the leg bends backwards, the vertical drive shaft simply pulls out of its spline. The inside of the transmission is now open to the ocean but no water can escape into the boat and the vital mounting joint between transmission and hull will remain not only intact but undamaged thanks to the energy absorption of the big twin O-rings."
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Old 07 January 2005, 12:14   #7
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wow.
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Old 07 January 2005, 12:40   #8
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That is pretty amazing looking engine and leg.
I don't think it will take hitting small semi floating logs very well.
Where a "normal" rear facing props have some protection.
very interesting
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Old 07 January 2005, 14:21   #9
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Does the 'leg' swivel for steering?

And being duo prop, one crunch and TWO props knackered! could be expensive.
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Old 07 January 2005, 20:03   #10
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there is a big write up in sportsboat and rib mag this month. It all works on the basis that the props see clean water flow. 30% more efficient apparently and tighter turning circle too.

Tim
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