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Old 02-13-2014, 07:24 PM   #21
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City: Vallejo CA
Country: USA
Vessel Name: Carquinez Coot
Vessel Model: 2011 Seahorse Marine Coot hull #6
Join Date: Sep 2010
Posts: 9,113
Many people appear to be shy about disclosing their typical RPM settings and their fuel consumption rates.


Kar-KEEN-ez Koot
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Old 02-13-2014, 07:58 PM   #22
City: Tri Cities, WA
Country: USA
Vessel Name: Beachcomber
Vessel Model: Sea Ray 550 Sedan Bridge
Join Date: Nov 2012
Posts: 2,142
My boat weighs around 58,000 pounds when it's loaded. It's 61.5' LOA and has a LWL around 50'.

For what it's worth, here are my numbers:

800 RPM: idle, dead slow, one-third. With mine, at 800 rpm's I'm doing about 8.5kts. This is a bit below hull speed. I don't really have a no-wake speed unless I take it in and out of gear.

1000 RPM: no wake. 10.5kts. This is close to hull speed and a very comfortable "slow cruise" speed for when we're not in a hurry to get somewhere. .

1400-1600 RPM: slow, two-thirds (easy cruise). I almost never run at this rpm range because it's too inefficient for my boat.

1750 RPM: standard (normal cruise). This is 80% of WOT throttle and (depending on load--water/fuel, etc.) we're cruising around 22-24kts. We cruise at this rpm if we're heading somewhere and don't want to dawdle. The boat really likes this as a fast cruise speed. The Cats are humming and the boat rides and handles well.

2150 RPM: flank speed, wide-open throttle. I don't run at this rpm range because we're burning ~65gph. We're cruising right at 30.1-30.3kts. The boat really likes this speed. I really don't like the fuel consumption so we don't do it often.

Mike and Tina
Beachcomber 1995 Sea Ray 550 Sedan Bridge
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Old 02-14-2014, 12:43 AM   #23
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City: UMR MM283
Country: US
Vessel Name: Northern Lights II
Vessel Model: Bayliner 3870
Join Date: Jan 2013
Posts: 1,139
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Ron on Northern Lights II
I don't like making plans for the day because the word "premeditated" gets thrown around in the courtroom.
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