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Old 20-07-2009, 07:43 PM   #1
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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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Old 20-07-2009, 09:03 PM   #2
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I always thought this looked promising
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Old 20-07-2009, 09:12 PM   #3
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reckon they'd pick up quicker with a quicker response..... they have fascinated me
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Old 20-07-2009, 09:13 PM   #4
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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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Old 20-07-2009, 10:33 PM   #5
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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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Old 21-07-2009, 12:25 AM   #6
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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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Old 21-07-2009, 12:28 AM   #7
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Then again!!!

http://forums.screamandfly.com/forum...07&postcount=7
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Old 21-07-2009, 10:41 AM   #8
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Quote:
Originally Posted by larby View Post
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
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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Old 21-07-2009, 12:56 PM   #9
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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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Old 21-07-2009, 03:42 PM   #10
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Quote:
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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
How did it go.... if you remember?
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Old 21-07-2009, 03:52 PM   #11
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Used to be an 8 metre Pascoe rib with one.
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Old 21-07-2009, 04:17 PM   #12
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How did it go.... if you remember?
I was too busy watching Burty in what was to become my new boat at the time

gaZ
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Old 24-07-2009, 09:05 AM   #13
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was that the one with the pupley checkerplate trailer?? if you remeber gaz,
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Old 14-11-2012, 08:13 PM   #14
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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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Old 14-11-2012, 08:34 PM   #15
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Quote:
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Yeah, I'd imagine the main advantages of the duo-prop would be acceleration and stability?

James
GOT IN ONE. or should i say two
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Old 15-11-2012, 02:39 AM   #16
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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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Old 15-11-2012, 09:44 PM   #17
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Quote:
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More details here for the merc Deuce high gearcase:[/url]
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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Old 16-11-2012, 02:02 AM   #18
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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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Old 16-11-2012, 01:57 PM   #19
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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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Old 17-11-2012, 10:22 AM   #20
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Quote:
Originally Posted by Hydrostream View Post
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!
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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