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20-07-2009, 07:43 PM
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#1
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Young Blood
Country: England
Location: Lymington \ Hampshire
Occupation: MDL Marinas
Interests: Skipper/Teaching. Drinking/Partying
Cruising area: Solent
Join Date: Mar 2009
Location: Lymington \ Hampshire
Posts: 269
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Duo Prop Outboard... MMmmhhmmm
Hey guys... So I have attached a picture of an engine I saw today... I have NEVER seen one of these come up are river and I was wondering if anyone knew if there were any GOOD or for that matter BAD points about a duo prop outboard.
Look forward to hearing your answers.
Luke
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20-07-2009, 09:03 PM
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#2
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Registered User
Join Date: Sep 2007
Posts: 513
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I always thought this looked promising
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20-07-2009, 09:12 PM
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#3
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Young Blood
Country: England
Location: Lymington \ Hampshire
Occupation: MDL Marinas
Interests: Skipper/Teaching. Drinking/Partying
Cruising area: Solent
Join Date: Mar 2009
Location: Lymington \ Hampshire
Posts: 269
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reckon they'd pick up quicker with a quicker response..... they have fascinated me
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20-07-2009, 09:13 PM
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#4
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Registered User
Location: West Coast of Norway
Occupation: naval architect
Interests: surface piercing props, stepped hulls, air entrapment hulls
Boat name: none
Boat make: PetterTintorera
Engines: Yamaha 90
Cruising area: West Coast of Norway
Join Date: Sep 2005
Location: West Coast of Norway
Posts: 888
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Have not seen the merc before, what is it? 2 speed duoprop? Is it based on the old blackhawk drive?
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20-07-2009, 10:33 PM
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#5
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Registered User
Country: Guernsey
Occupation: Engineering
Boat make: None, boo!
Engines: Turbines mainly!
Cruising area: The inside of my workshop!
Join Date: Mar 2008
Posts: 2,646
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Yeah, i like the merc too, never seen that one before!! Very interested in the 2 speed bit. I'd imagine the main advantages of the duo-prop would be acceleration and stability?
James
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21-07-2009, 12:25 AM
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#6
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Registered User
Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin
Join Date: May 2004
Location: Dublin
Posts: 1,803
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Deuce High
It wasn't exactly two speed, the two props had different gear ratios! Or so I believe!
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21-07-2009, 12:28 AM
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#7
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Registered User
Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin
Join Date: May 2004
Location: Dublin
Posts: 1,803
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21-07-2009, 10:41 AM
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#8
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Young Blood
Country: England
Location: Lymington \ Hampshire
Occupation: MDL Marinas
Interests: Skipper/Teaching. Drinking/Partying
Cruising area: Solent
Join Date: Mar 2009
Location: Lymington \ Hampshire
Posts: 269
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Quote:
Originally Posted by larby
Yeah, i like the merc too, never seen that one before!! Very interested in the 2 speed bit. I'd imagine the main advantages of the duo-prop would be acceleration and stability?
James
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Might see if I can have a go on the yamaha 150 Pro MAx see what it does... wonder what they'd be like on a ring / phantom.....
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21-07-2009, 12:56 PM
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#9
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Registered User
Occupation: Champion Pie Eater
Boat name: On The Rocks
Boat make: Ring 21 marshan 17 four winns horizon, hydro 3 pointer, f2 cat, backdraft 22
Cruising area: Way up norf and Sarf coast areas
Join Date: Apr 2007
Posts: 1,619
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The Merc one was out about 98ish,
There used to be a Yamaha twin prop set up in the ski racing a couple of years back at Torquay.
gaZ
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21-07-2009, 03:42 PM
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#10
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Young Blood
Country: England
Location: Lymington \ Hampshire
Occupation: MDL Marinas
Interests: Skipper/Teaching. Drinking/Partying
Cruising area: Solent
Join Date: Mar 2009
Location: Lymington \ Hampshire
Posts: 269
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Quote:
Originally Posted by gazza
The Merc one was out about 98ish,
There used to be a Yamaha twin prop set up in the ski racing a couple of years back at Torquay.
gaZ
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How did it go.... if you remember?
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21-07-2009, 03:52 PM
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#11
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Registered User
Join Date: Sep 2007
Posts: 513
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Used to be an 8 metre Pascoe rib with one.
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21-07-2009, 04:17 PM
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#12
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Registered User
Occupation: Champion Pie Eater
Boat name: On The Rocks
Boat make: Ring 21 marshan 17 four winns horizon, hydro 3 pointer, f2 cat, backdraft 22
Cruising area: Way up norf and Sarf coast areas
Join Date: Apr 2007
Posts: 1,619
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Quote:
Originally Posted by LukeJustLuke
How did it go.... if you remember?
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I was too busy watching Burty in what was to become my new boat at the time
gaZ
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24-07-2009, 09:05 AM
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#13
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Registered User
Country: engalnd
Location: south west
Interests: ski racing
Boat name: Jack'd up, hellraiser
Boat make: Bernico 19 ET, ring 16
Engines: merc 135, merc 175, yam 90
Cruising area: Plymouth
Join Date: Jun 2006
Location: south west
Posts: 1,176
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was that the one with the pupley checkerplate trailer?? if you remeber gaz,
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14-11-2012, 07:13 PM
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#14
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Registered User
Join Date: Mar 2006
Posts: 21
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We know Z-drives with Duoprop systems for years : Volvo Penta started it and MerCruiser followed with the Bravo Three)
For outboards there were only the above two attempts which did not really come through as an outboard optional system, and I wonder why?
Yamaha has released the 150 hp VMax years back with a Duoprop.
Now I came to the conclusion that Mercury experimented with such a duoprop on a 2.5 racing block : the 200 deuce. The Merc duoprop system was different from the Yamaha VMAX 150 TRP, since the second prop is shifted in when certain rpm (horsepower) is reached, providing excellent holeshot and topspeed ...
Anyone ever tried something like that and compared it to a single prop version?
Anyone have an idea why it does not get standarized?
Theoretically the system still has undoubted advantages:
- The right propeller effect on the boat is neutralized
- No or substantially less impact on steering
- The tail has limited or no additional weight
- ...
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14-11-2012, 07:34 PM
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#15
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Registered User
Join Date: Oct 2012
Posts: 54
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Quote:
Originally Posted by larby
Yeah, I'd imagine the main advantages of the duo-prop would be acceleration and stability?
James
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GOT IN ONE. or should i say two
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15-11-2012, 01:39 AM
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#16
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BAD HABIT
Country: FRANCE
Interests: speed on water/technics
Boat make: INVADER
Engines: MERC 250XS/SM 1.62
Cruising area: south Britany
Join Date: May 2007
Posts: 562
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Mercury Racing Deuce High gearcase
More details here for the merc Deuce high gearcase:
and for the yamaha 150 TRP, good explanation here :
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15-11-2012, 08:44 PM
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#17
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Registered User
Country: Belgium
Location: near Ghent
Occupation: engineer
Interests: boating, wakeboarding, snowboarding, fitness
Boat name: Outlaw
Boat make: Phantom 21ft
Engines: Yamaha 200hp
Cruising area: Zele / Kanaal Gent-Terneuzen
Join Date: Jun 2006
Location: near Ghent
Posts: 473
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Quote:
Originally Posted by Frenchbruno
More details here for the merc Deuce high gearcase:[/url]
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you mean the picture Frenchbruno ? Or does your post lack a internetlink ?
I think the duoprops are an interesting concept. Used in shallow waters I believe... Particularly the Merc is interesting since it actually has a gearshift + runs with the torpedo above waterlevel.
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16-11-2012, 01:02 AM
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#18
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Registered User
Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin
Join Date: May 2004
Location: Dublin
Posts: 1,803
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What does it mean run in shallow water? Do they mean run at high engine heights? Are those the water pickups on the side of the skeg? Sure looks like a very short mid section, I never noticed that before!
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16-11-2012, 12:57 PM
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#19
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Registered User
Country: UK
Location: Guernsey
Occupation: Network Engineer
Boat make: Argo 21
Engines: 2.5 EFI
Cruising area: Channel Islands
Join Date: May 2009
Location: Guernsey
Posts: 426
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If anyone is interested you can buy the yamaha trp boxes here: http://www.boats.net/parts/detail/ya...300-01-NA.html
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17-11-2012, 09:22 AM
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#20
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Registered User
Country: Belgium
Location: near Ghent
Occupation: engineer
Interests: boating, wakeboarding, snowboarding, fitness
Boat name: Outlaw
Boat make: Phantom 21ft
Engines: Yamaha 200hp
Cruising area: Zele / Kanaal Gent-Terneuzen
Join Date: Jun 2006
Location: near Ghent
Posts: 473
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Quote:
Originally Posted by Hydrostream
What does it mean run in shallow water? Do they mean run at high engine heights? Are those the water pickups on the side of the skeg? Sure looks like a very short mid section, I never noticed that before!
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the TRP has a midsection that is over 2" shorter than a standard 150 and has a factory supplied low water pick-up and a crescent leading edge type gearcase.
Running in shallow waters means that I've read somewhere on the net that the TRP is very popular in the US on locations with shallow waters. I don't immediately recall the exact region, but you get the idea. This is because the improved acceleration and higher engine mount gets the boat on plane very quickly. You can see this in following vid :
Greets, T.
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