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Old 05-30-2007, 12:24 AM
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Default Dual prop vs: single on outdrive

I'm sure this has been discussed before but I don't seem to be able to find it. I'm changing the outdrive on my 7K# cruiser. I have a 250 hp V8. What are the advantages / disadvantages of the dual props units (Volvo or Mercruiser) over replacing the Bravo II, single prop drive?
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Old 05-30-2007, 01:58 AM
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Default Re: Dual prop vs: single on outdrive

Duo prop advantages: no prop walk/better low speed manuvering, better cruise/fuel economy.
Disadvantages: $$$, less top end speed.
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Old 05-30-2007, 02:02 AM
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Default Re: Dual prop vs: single on outdrive

Yeah, and $1500.00 for a new set of props.
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Old 05-30-2007, 07:02 AM
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Default RE: Dual prop vs: single on outdrive

The previous posters are correct except for the lower top speed and price. In your application you would probably get a bit higher top speed. Prices for the Volvo propsets are around $650 for aluminum, $1,200 for SS. B III props only in SS, around same price as Volvo. Twin prop outdrives also give better acceleration than singles.
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Old 05-30-2007, 07:35 AM
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Default RE: Dual prop vs: single on outdrive

Hope you are correct-- just purchased boat with a Dual prop Volvo SS---- Question why don't outboards have these?
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Old 05-30-2007, 08:28 AM
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Default RE: Dual prop vs: single on outdrive

Quote:
Eyehooker - 5/30/2007 7:35 AM

Hope you are correct-- just purchased boat with a Dual prop Volvo SS---- Question why don't outboards have these?
good question. i've wondered that myself before. anyone?
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Old 05-30-2007, 09:12 AM
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Default Re: Dual prop vs: single on outdrive

Didn't Yamaha have a setup like that?
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Old 05-30-2007, 09:25 AM
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Default RE: Dual prop vs: single on outdrive

I have the Volvo Penta Duoprop. On my old boat I had an Alpha 1. The difference is night and day as far as handling. The difference is most notable when docking in tight spots. Docking is a lot easier with the duoprop. The turning radius is nice and tight.

As far as accelaration planing happens in just a couple of seconds. Can't compare with the Mercruiser because it was 165hp and the Volvo is 270hp.

As far as fuel efficiencey. 3.3 mpg at cruise of 25

Top speed 45 mph with a 5,000 pound boat.

LooneyTunes
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Old 06-04-2007, 10:36 PM
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Default RE: Dual prop vs: single on outdrive

Looneytunes -- I hope you are correct on the speed-- Just purchased 23 Steiger @ 5k weight with 250 hp with duo props I was hoping for 35
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Old 06-05-2007, 01:08 AM
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Default Re: Dual prop vs: single on outdrive

You shouldn't have any problem making 35 mph. You're talking mph and not knots, right?
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Old 06-05-2007, 01:31 AM
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Default RE: Dual prop vs: single on outdrive

Quote:
Eyehooker - 5/30/2007 7:35 AM

Question why don't outboards have these?







Yamaha did have a dual-prop model. One or two seasons worth anyway.

Pulled due to lack of interest.

They had an I/O too. Not dual-prop, but it was a good one. They actually pioneered the transom tilt switch. Theirs was on the I/O unit itself. Now most everyone has a transom tilt switch. Great feature, too.


Now that I have had two boats with dual-prop i/o's, I'll never go back to a single.



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Old 06-11-2007, 04:30 PM
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Default RE: Dual prop vs: single on outdrive

Quote:
Eyehooker - 6/4/2007 10:36 PM

Looneytunes -- I hope you are correct on the speed-- Just purchased 23 Steiger @ 5k weight with 250 hp with duo props I was hoping for 35
If you were hoping for 35mph you will be pleasantly surprised.

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