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Old 24-05-2010, 19:39   #1
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Cruise Speed / Max Speed - Diesel

I'd like to know how fast you guys can get these cats in the 40-50 ft range
cruise and max ,please note engine type and hp and fuel consumption if you know.
Mike
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Old 25-05-2010, 09:12   #2
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Hey, I have a St. Francis 43....2 new 2009 Beta 27 hp to saildrive, folding props. Calm weather flat water 2 engine 2200rpm cruise speed 7.5k 4.5 liters and hour total for both engines.....3000 rpm 8 knots...approx 6 liters an hour. Best efficiency, 1 engine 2200rpm 6.5 knots..2.2 liters an hour.
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Old 25-05-2010, 10:00   #3
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46' with 2 Nanni 29hp, straight shafts, Kiwiprops. Still in run-in period but I get 5 knots at 1800rpm with one engine, 6 knots with 2.
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Old 25-05-2010, 11:13   #4
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I can do the quarter in under 120 seconds (after spending 5 minutes getting the anchor up); the mile is somewhere between 420 - 600 seconds.

Yanmar 3YM30s, 27HP, cruise @ 2800, max 3400

Fair Winds,
Mike
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Old 25-05-2010, 20:35   #5
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40 hp Volvos. 7.5 knots @2500rpm-twin bladed props (I need to replace with 3 blades)
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Old 25-05-2010, 20:43   #6
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I cruise at 7 knots in smooth water at 2950 rpm on 2 engines or 6 knots at 2950 on 1 engine. Fuel consumption approximately 1.5 gallons per hour and .75 gallons per hour. I can get 8.5 knots at max rpm of 3800. I have never used that power level enough to measure fuel consumption at full throttle. Engines are Yanmar 3JH3CE at 40 hp each. I use 3 blade autostream feathering props.
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Old 25-05-2010, 21:25   #7
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Cat speed cruise/max

43 Privilege w/4 ft transom extensions; 56 hp Yanmar 4jh3, fixed 3 blade props w/ straight drives. 2ft or less seas/chop: cruise speed 9kts 3200 rpm - less than 2gph; 6.5 to 7kts on one engine. Max spd 11kts at 3600 rpm. (approx weight now 16 tons w/ full tanks)
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Old 25-05-2010, 22:24   #8
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gosh! I'm feeling so much better about my monohull. Yanmar 4JH3TE. 46-foot medium displacement battleship. 8 knots at .75 GPH on a 20" prop.

And I only have to clean one hull to get those results!
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Old 25-05-2010, 22:56   #9
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8 knots at .75 GPH on a 20" prop.
yeah, I'd freak if we ever used more than 2 litres (1/2 gal) per hour.

Cats seem to burn juice.
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Old 25-05-2010, 22:58   #10
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yeah, I'd freak if we ever used more than 2 litres (1/2 gal) per hour.

Cats seem to burn juice.
Well, yes. But not at quite the same rate as mega-yachts.
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Old 26-05-2010, 05:09   #11
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Oh Boy!
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Old 26-05-2010, 06:08   #12
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Volvo Penta D1-30 HP with 3 bladed folding props

The VP D1-30 HP engines allows us to motor with just one engine running 2,200 RPM at 7.5 knots using .65 gal/hour or 2,500 RPM at 8 knots using .85 gal/hours.
You will put less hours on each engine and use less fuel by using one engine. In a 6 month season we only put 50 hours on each engine using this one engine method and she tracks nicely with the autopilot doing all the steering.

Two engines are only used for docking and only get 9 knots if we motor with both engines at 2200 rpm using 1.3 gal/hours.

The 3 bladed folding props are 17" Dia. X 12" Pitch Left Hand (Counter Clockwise)
These 3 folding blades have less vibration than 2 bladed props and the folding allows you to run on one engine without the drag of the other static prop.

Mark
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Old 26-05-2010, 06:19   #13
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FP 43 Belize, 3GM30s (27hp) w/saildrives, 7kts @ 2700 rpm with both engines, 2 liters per hour per engine. 5.5kts one engine.
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Old 26-05-2010, 07:34   #14
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10 at 2400 swinging a 22" max prop with a W108c6 using 1.75 gph in flat water.
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Old 26-05-2010, 09:09   #15
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Why do people always have to respond to every multihull thread talking crap and starting drama?

The OP clearly states:

Quote:
I'd like to know how fast you guys can get these cats in the 40-50 ft range
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