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15 February 2008, 11:14
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#1
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Member
Country: UK - Scotland
Town: Huntly
Make: Searider 4.7
Length: 4m +
Engine: 75 Suzuki
Join Date: Oct 2004
Posts: 186
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Pac 22 Surface Drive
Has anyone fitted a Pac 22 with a surface drive?
Pros/cons don't do it?
Just sold my boat so getting withdrawl symptoms 
Anyone up here in Scotland looking to sell their rib?
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15 February 2008, 12:32
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#2
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Member
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
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Quote:
Originally Posted by ALANT
Has anyone fitted a Pac 22 with a surface drive?
Pros/cons don't do it?
Just sold my boat so getting withdrawl symptoms
Anyone up here in Scotland looking to sell their rib? |
Why would you want to do that? And what power would you put in it?
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Cookee
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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15 February 2008, 13:54
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#3
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Member
Country: UK - Scotland
Town: Huntly
Make: Searider 4.7
Length: 4m +
Engine: 75 Suzuki
Join Date: Oct 2004
Posts: 186
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Why; less moving parts than z drive less power loss.
Size of engine about 250-300hp 6cyl diesel.
Why hasn't it been done a few jetdrives which don't seem to work but no surface drives.
Just toying with idea for summer project.
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15 February 2008, 14:16
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#4
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Member
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
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Quote:
Originally Posted by ALANT
Why; less moving parts than z drive less power loss.
Size of engine about 250-300hp 6cyl diesel.
Why hasn't it been done a few jetdrives which don't seem to work but no surface drives.
Just toying with idea for summer project.
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Why not: More expensive, only ever used on high performance stuff - although I don't know the theory I do know they are less efficient at lower speeds, less manoeuvrable, and big prop and drive stuck out the back of your boat.
Jet drives do work, but most efficient at one particular speed. Bravo one drives are generally accepted as working fine up to about 315hp, beyond that you have to have more respect for the drive!
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Cookee
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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16 February 2008, 19:13
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#5
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Member
Country: UK - Wales
Town: Barmouth
Boat name: Blue Marlin
Make: Ribcraft
Length: 7m +
Engine: Yanmar 315/Bravo 2X
MMSI: 235020218
Join Date: Jun 2003
Posts: 827
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Would the Yellowfin address any of those 'unfavourable' issues, or is the whole surface drive idea too much of a compromise?
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16 February 2008, 19:27
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#6
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RIBnet admin team
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: Tohatsu 30HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 11,632
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Quote:
Originally Posted by DGR
Would the Yellowfin address any of those 'unfavourable' issues, or is the whole surface drive idea too much of a compromise?
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Yellowfin is not a surface drive, or am I miss understanding your question?
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17 February 2008, 10:00
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#7
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Member
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
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Quote:
Originally Posted by DGR
Would the Yellowfin address any of those 'unfavourable' issues, or is the whole surface drive idea too much of a compromise?
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As Polwort says Yellowfin is something totally different - Surface drives are not a compromise solution, you should think of them as being a solution for a different application. Trimax and Arneson are the two main drives - Sunseeker use Trimaxes a lot on their sporty boats, a friend has a triple diesel Superhawk (I think it's 53') with two speed Trimax drives, and if you want to get more than 315hp diesel power into the water, the only mainstream route is surface drives or shafts - for instance the Yanmar 440 doesn't have a sterndrive that will reliably handle that sort of power IMHO!
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Cookee
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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17 February 2008, 12:22
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#8
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Member
Country: UK - Wales
Town: Barmouth
Boat name: Blue Marlin
Make: Ribcraft
Length: 7m +
Engine: Yanmar 315/Bravo 2X
MMSI: 235020218
Join Date: Jun 2003
Posts: 827
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Quote:
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Originally Posted by Cookee
As Polwort says Yellowfin is something totally different ...
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OK - I'm probably just confused because they call it a 'Variable Surface Drive'.
I understood that to mean that it acts more like a propeller at low speeds (i.e. completely immersed), but like a surface drive when on the plane - as I can't see how the whole drive would stay in the water when on the plane!!
ANYWAY - didn't mean to thread-jack, just curious as to how good or bad a Yellowfin might be (especially on a 7.8m RIBCraft with a 315HP Yanmar...  )
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18 February 2008, 09:56
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#9
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Member
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
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Quote:
Originally Posted by DGR
OK - I'm probably just confused because they call it a 'Variable Surface Drive'.
I understood that to mean that it acts more like a propeller at low speeds (i.e. completely immersed), but like a surface drive when on the plane - as I can't see how the whole drive would stay in the water when on the plane!!
ANYWAY - didn't mean to thread-jack, just curious as to how good or bad a Yellowfin might be (especially on a 7.8m RIBCraft with a 315HP Yanmar... ) |
I have only seen a couple of youtube videos of it working and the website isn't saying anything at all interesting, but I haven't heard of any drives being fitted to boats, maybe they will start appearing if they aren't too expensive and complicated
The Yellowfin says it is the perfect drive for everything so that's obviously the one you want!
__________________
Cookee
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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18 February 2008, 20:47
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#10
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Member
Country: UK - Wales
Town: Barmouth
Boat name: Blue Marlin
Make: Ribcraft
Length: 7m +
Engine: Yanmar 315/Bravo 2X
MMSI: 235020218
Join Date: Jun 2003
Posts: 827
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Quote:
Originally Posted by Cookee
The Yellowfin says it is the perfect drive for everything so that's obviously the one you want!
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Yes indeed, not to mention the 60% increase in efficiency, 50% speed increase, and 100% increase in the number of bikini clad babes I can pull on a day at the beach...( )...and one of those benefits caught my attention......
It's supposed to be available this year (2008), but would be interested to know how reality stacks up to the hype.
Until then, my Bravo 2X has survived over 500 hours of RIB-Riding at 35+ kts, and it seems to be coping quite nicely...(fingers crossed, touching wood, etc, etc, etc)...
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18 February 2008, 20:49
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#11
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RIBnet admin team
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: Tohatsu 30HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 11,632
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Quote:
Originally Posted by DGR
and 100% increase in the number of bikini clad babes I can pull on a day at the beach
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100% of zero = zero.
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19 February 2008, 17:55
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#12
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Member
Country: UK - Wales
Town: Barmouth
Boat name: Blue Marlin
Make: Ribcraft
Length: 7m +
Engine: Yanmar 315/Bravo 2X
MMSI: 235020218
Join Date: Jun 2003
Posts: 827
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Quote:
Originally Posted by Polwart
100% of zero = zero.
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Ooooh!!! Cruel....
...but disappointingly - quite accurate......
It must be my stinky diesel... 
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19 February 2008, 20:26
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#13
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RIBnet admin team
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: Tohatsu 30HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 11,632
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Quote:
Originally Posted by DGR
It must be my stinky diesel... |
they don't seem to be a fan of 2-smoke either! Or perhaps its the weather up here
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22 February 2008, 06:11
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#14
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Member
Country: UK - Scotland
Town: Oban (mostly)
Make: Ribcraft, Humber,BWM
Length: 5m +
Engine: Outboards
Join Date: Jan 2008
Posts: 632
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Quote:
Originally Posted by Polwart
they don't seem to be a fan of 2-smoke either! Or perhaps its the weather up here |
Since I've found exactly the same with a nice quiet environmentally friendly 4-stroke ....... yep, it's the weather!
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