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TOPIC: Different Boat This Year

Different Boat This Year 20 Jun 2009 16:31 #1

  • LatAVN
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WOW is about all I can say about the difference the duo prop makes over the single prop 280 outdrive.

With Rick's help, I managed to locate a duo prop lower unit and had it installed a couple weeks ago. I was going to do it myslef but after breaking a bolt off when removing my exhaust manifolds, I chose to let someone else install the drive.

The diffence the duo prop makes on this boat, 1894 2850 Contessa with a Command Bridge, equates to about 8 - 9 more knots at cruise, 3200 - 3400 RPM. Based on the weight of this boat and the AQ260A engine, I had to go with the B2 props. With this configuration, AQ20A/280DP with B2 props, I am cruising at 19.8 knots (GPS readout) at 3300 RPM and 31.3 knots at 4400 (WOT). Prior to the duo props I had to have the trim tabs down to stay on plane, now I don't touch the tabs to plane and only make a slight adjustment to the tabs to level the deck.

For those out there that are wondering if it is worth the cost, I am a firm believer that it is. My "first mate" is having to wear a shoulder harness this year because of the hole shot and extra speed over last year. :)

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Al
1984 2850 Contessa w/Cmd Bridge
AQ 260A w/ V/P 280 Drive w/DP & B2s

Different Boat This Year 20 Jun 2009 16:56 #2

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Al, thanks for the update..... glad to hear that you are a happy camper! :arr

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Rick E. Portland, Oregon
2850 Bounty Sedan Flybridge model
Twin 270 HP 5.7's w/ Closed Cooling
Volvo Penta DuoProp Drives
Kohler 4 CZ Gen Set

Different Boat This Year 20 Jun 2009 17:51 #3

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You'll find docking speeds and control much better also.

If you really want to feel good, figure out the gas savings on a 40 mile trip on plane.

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Mike C.
1985 Bayliner Contessa Command Bridge :coo-
Brand New (2013) Custom Volvo Penta 7.4GL with Full closed cooling
Duo Prop and SS props:go-
Through hull exhaust with fiberglass mufflers and through hull raw water intake
35 Gal. FW Tank, 10 Gal. Holding Tank
9'6" Baltik Dinghy with Evinrude...

Different Boat This Year 20 Jun 2009 18:01 #4

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Al, I haveteh same boat as you and have a top speed under IDEAL conditions of 39.4 MPH. My fuel mileage has gone to just a bit over 1.5 MPG. The difference is HUIGE and ia lso am using B2's. Welcome to the DP conversion club! It is a GREAT place to be!:)

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Tony, Cape Cod, MA
Vice Commodore Bourne Yacht Club
1994 Carver 390 Cockpit Motor Yacht
454 Merc Cruisers inboards
"HOLODECK"
2014 10' hard bottomed Dink powered by 3.3HP Mariner 2 stroke
www.bourneyachtclub.com

Different Boat This Year 20 Jun 2009 18:24 #5

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LatAVN;312450 wrote: The diffence the duo prop makes on this boat, 1894 2850 Contessa with a Command Bridge, equates to about 8 - 9 more knots at cruise, 3200 - 3400 RPM. Based on the weight of this boat and the AQ260A engine, I had to go with the B2 props. With this configuration, AQ20A/280DP with B2 props, I am cruising at 19.8 knots (GPS readout) at 3300 RPM and 31.3 knots at 4400 (WOT).


That is blazing fast for a 115 year old boat!....:kidding

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2252 Ciera - Sold
12" Sea Nymph

Different Boat This Year 20 Jun 2009 21:28 #6

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tonyiiiafl;312486 wrote: Al, I haveteh same boat as you and have a top speed under IDEAL conditions of 39.4 MPH. My fuel mileage has gone to just a bit over 1.5 MPG. The difference is HUIGE and ia lso am using B2's. Welcome to the DP conversion club! It is a GREAT place to be!:)


Whoa... I thought you were using B3's.

I was upset that I had to use B2's but now I feel better.:prod

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Mike C.
1985 Bayliner Contessa Command Bridge :coo-
Brand New (2013) Custom Volvo Penta 7.4GL with Full closed cooling
Duo Prop and SS props:go-
Through hull exhaust with fiberglass mufflers and through hull raw water intake
35 Gal. FW Tank, 10 Gal. Holding Tank
9'6" Baltik Dinghy with Evinrude...
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