Empathy List Archives

D

David

Wed, Oct 30, 2002 4:54 PM

At 10:11 PM 10/29/2002 -0500, Chuck Shipley wrote:
snip< Careful now. These numbers are sounding much like the truth, which is a

break with nautical tradition. You may not fit in with the other guys at
the bar anymore.<g>

I guess we Krogenites are all liars. :-) I claim I get about the same
burn rate as Keith reports. (4 smpg) I cruise at about 1825 rpm.
Average a little over 7 knots, I reckon. Hardly make enough wake for
the dolphins to play in, let alone ducks!
Chuck Shipley | When the fox preaches, look to the geese.
KK42-152 "Tusen Takk" | --German Proverb
Savannah, GA |

snip

I believe those feisty Krogeners. 4 statute miles per gallon that is about
3.5 NM/gallon. My 42 Hat LRC is running at 2100 RPMs with two engines at 8
knots at 1.3 times hull speed, gets just on the wrong side of 2 NM/gallon.
One engine on center, at less rpms 1850 and 1.1 hull speed should get you
close to 3.5nm/gallon.
BTW my 5gph does not include the generator. The gen set pulls from its own
tank.

Sorry I don't have good numbers at 7 knots, but things change quickly as
you approach 1.3 hull speed with displacements boats. The Hat 42 is 38.25
LWL. A 12 percent drop in speed is significant when pushing over the bow
wave. Anyone have 8 knot figures on a 42 Krogen?

Skooch 42 Hatteras LRC
Worton Creek MD

David Stahl

           Beacon Technologies Inc.
          Serving The Delaware Valley
   Business and Residential Internet Services

At 10:11 PM 10/29/2002 -0500, Chuck Shipley wrote: snip< Careful now. These numbers are sounding much like the truth, which is a >> break with nautical tradition. You may not fit in with the other guys at >> the bar anymore.<g> >I guess we Krogenites are all liars. :-) I claim I get about the same >burn rate as Keith reports. (4 smpg) I cruise at about 1825 rpm. >Average a little over 7 knots, I reckon. Hardly make enough wake for >the dolphins to play in, let alone ducks! > Chuck Shipley | When the fox preaches, look to the geese. >KK42-152 "Tusen Takk" | --German Proverb > Savannah, GA | snip I believe those feisty Krogeners. 4 statute miles per gallon that is about 3.5 NM/gallon. My 42 Hat LRC is running at 2100 RPMs with two engines at 8 knots at 1.3 times hull speed, gets just on the wrong side of 2 NM/gallon. One engine on center, at less rpms 1850 and 1.1 hull speed should get you close to 3.5nm/gallon. BTW my 5gph does not include the generator. The gen set pulls from its own tank. Sorry I don't have good numbers at 7 knots, but things change quickly as you approach 1.3 hull speed with displacements boats. The Hat 42 is 38.25 LWL. A 12 percent drop in speed is significant when pushing over the bow wave. Anyone have 8 knot figures on a 42 Krogen? Skooch 42 Hatteras LRC Worton Creek MD David Stahl ************************************************************** Beacon Technologies Inc. Serving The Delaware Valley Business and Residential Internet Services

BW

Bob Walters

Wed, Oct 30, 2002 11:58 PM

Anyone have 8 knot figures on a 42 Krogen?<<

I don't have any test data; however, it's easy enough to figure this sort of
stuff for displacement boats.

Assuming a 42,000 pound boat with a 39'2" waterline length and a modern,
fuel efficient, direct injection diesel engine it would take about 74 shaft
hp to drive the boat at 8 knots and that equates to about 2.1 nautical miles
per gallon.

Two point one mpg should be real close to the "real world" numbers under
average conditions.

Bob Walters

>>Anyone have 8 knot figures on a 42 Krogen?<< I don't have any test data; however, it's easy enough to figure this sort of stuff for displacement boats. Assuming a 42,000 pound boat with a 39'2" waterline length and a modern, fuel efficient, direct injection diesel engine it would take about 74 shaft hp to drive the boat at 8 knots and that equates to about 2.1 nautical miles per gallon. Two point one mpg should be real close to the "real world" numbers under average conditions. Bob Walters

CA

Captain Al Pilvinis

Thu, Oct 31, 2002 10:42 PM

At 05:58 PM 10/30/02 -0600, you wrote:

Anyone have 8 knot figures on a 42 Krogen?<<

I don't have any test data; however, it's easy enough to figure this sort of
stuff for displacement boats.

Assuming a 42,000 pound boat with a 39'2" waterline length and a modern,
fuel efficient, direct injection diesel engine it would take about 74 shaft
hp to drive the boat at 8 knots and that equates to about 2.1 nautical miles
per gallon.

Two point one mpg should be real close to the "real world" numbers under
average conditions.

Bob Walters

---===========================
I think you are wrong Bob..........We burn less than 4GPH at 8 knots total
on twins with a larger heavier semi displacement hull at 1300 RPM. Our
normal cruise is 1400 to 1500 RPM doing 9+ kts burning less than 5 gph.
Twin Cummins 220's 2.5 reduction wheeled heavy.
Captain Al Pilvinis

"M/V Driftwood"--Prairie 47
2630 N.E. 41st Street
Lighthouse Point, Fl 33064-8064
Voice 954-941-2556 Fax 954 788-2666
Email yourcaptain@earthlink.net
Website http://home.earthlink.net/~yourcaptain

At 05:58 PM 10/30/02 -0600, you wrote: >>>Anyone have 8 knot figures on a 42 Krogen?<< > >I don't have any test data; however, it's easy enough to figure this sort of >stuff for displacement boats. > >Assuming a 42,000 pound boat with a 39'2" waterline length and a modern, >fuel efficient, direct injection diesel engine it would take about 74 shaft >hp to drive the boat at 8 knots and that equates to about 2.1 nautical miles >per gallon. > >Two point one mpg should be real close to the "real world" numbers under >average conditions. > >Bob Walters ============================================================ I think you are wrong Bob..........We burn less than 4GPH at 8 knots total on twins with a larger heavier semi displacement hull at 1300 RPM. Our normal cruise is 1400 to 1500 RPM doing 9+ kts burning less than 5 gph. Twin Cummins 220's 2.5 reduction wheeled heavy. Captain Al Pilvinis "M/V Driftwood"--Prairie 47 2630 N.E. 41st Street Lighthouse Point, Fl 33064-8064 Voice 954-941-2556 Fax 954 788-2666 Email yourcaptain@earthlink.net Website http://home.earthlink.net/~yourcaptain

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