Reply
 
Thread Tools Search this Thread Display Modes
 
Old 11-14-2015, 12:39 PM   #281
Guru
 
psneeld's Avatar
 
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 21,823
Just like in the Wizard of OZ....

"Just click your heels together three times"....

And anything is possible...
__________________
Advertisement

psneeld is online now   Reply With Quote
Old 11-14-2015, 01:49 PM   #282
Guru
 
Nomad Willy's Avatar
 
City: Concrete Washington State
Country: USA
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 17,071
Well I clicked three times ...

But it didn't happen.
__________________

__________________
Eric

North Western Washington State USA
Nomad Willy is offline   Reply With Quote
Old 11-14-2015, 08:32 PM   #283
Senior Member
 
tallswede's Avatar
 
City: Baytown, Texas
Country: USA
Vessel Name: Islander
Vessel Model: Prairie 36
Join Date: May 2013
Posts: 284
Well, I for one appreciate the folks willing to give speed and fuel burn numbers. I gives me at least an idea what to expect from my new (to me) trawler as I learn how it performs. As one who has had planing hulls or sailboats it does me good to see how boats near mine in size/waterline perform. Personaly, I enjoy getting as much efficiency out of my cars, motorcycles and boats as I can even if they are not known to be very efficient. Getting 20+ mpg out of my 4x4 Jeep and big engine '79 TransAm is fun to me especially when I know what their performance on the other end of the spectrum is. I'm sure the same will be true for my 36' Prairie. Besides, when we take a long trip in the car or the boat, it's nice to know how far we can go on a tank of fuel. Like another has said, it can buy a nice meal at the end of the day.

Kevin
tallswede is offline   Reply With Quote
Old 03-31-2019, 04:02 PM   #284
Veteran Member
 
BobnDoc's Avatar
 
City: Edmonds WA
Country: USA
Join Date: Feb 2018
Posts: 64
Quote:
Originally Posted by Moonstruck View Post
I cruise at 400-500 off the top. *-450 gives me 27 knots on flat, slack water.

It's really tough being in the minority again.


Hi Moonstruck

Iím almost with you. Have been running a Cutwater 30cb for two years with a Volvo D6 435hp that cruises at 18-20 knots with a WOT OF 26 knots.But those days are behind us. Recently bought a Symbol 45 (loa 48 ft., beam 15 ft) thatís powered by a pair Yanmar 440s. Had both structural and mechanical surveys done as well as a sea trial with the surveyors aboard taking measurements and running tests. At wot of 3100 rpm she did 17 knots. At what the PO called fast cruise (2800rpm) she did 14 knots. Havenít yet checked out slower cruise results, but expect to learn that and so much more on our maiden cruise with a professional captain from Baltimore to Port Everglades in two weeks.There weíll load her on a boat carrier vessel for the trip through the Panama Canal up the west coast to Vancouver BC. From there itís a short cruise to the Seattle area, just in time to begin our cruising season on the Salish Sea.
Even if we eventually cruise at 8-10 knots itís comforting to know what we have in reserve.
BobnDoc is offline   Reply With Quote
Old 03-31-2019, 05:59 PM   #285
Guru
 
Pete Meisinger's Avatar
 
City: Oconto, WI
Country: USA
Vessel Name: Best Alternative
Vessel Model: 36 Albin Aft Cabin
Join Date: Oct 2012
Posts: 1,449
My 36 Albin (single F.L. 120) does about 7 Kn, One time a tailwind pushed me up to almost 9. Always get around 3 mpg. I tell my friends that to go any faster I would need to run it over a waterfall!
Pete Meisinger is offline   Reply With Quote
Old 03-31-2019, 06:46 PM   #286
Guru
 
Woodland Hills's Avatar
 
City: Jacksonville
Country: USA
Vessel Name: Alzero
Vessel Model: Hatteras 63' CPMY
Join Date: Apr 2017
Posts: 1,492
We have a 63’ lwl and I cruise at 1050 rpm at 10/11 gph total which typically gives 9.7/10 kts. We can get up on plane and run at 1950rpm and 18/21 kts depending on water depth, but then we burn in the low to mid 30gph range per side. We rarely do it, but it really helps smooth out the ride when it gets choppy.
Woodland Hills is online now   Reply With Quote
Old 03-31-2019, 06:52 PM   #287
Guru
 
Nomad Willy's Avatar
 
City: Concrete Washington State
Country: USA
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 17,071
So Hills you have a planing hull then.
Are you running Detriots?
__________________
Eric

North Western Washington State USA
Nomad Willy is offline   Reply With Quote
Old 03-31-2019, 07:12 PM   #288
Guru
 
Woodland Hills's Avatar
 
City: Jacksonville
Country: USA
Vessel Name: Alzero
Vessel Model: Hatteras 63' CPMY
Join Date: Apr 2017
Posts: 1,492
Yes, an old Hatteras with two 12v71TIs @ 650hp each. 36”x36” wheels
Woodland Hills is online now   Reply With Quote
Old 03-31-2019, 07:28 PM   #289
Valued Technical Contributor
 
DavidM's Avatar
 
City: Litchfield, Ct/Punta Gorda, Fl
Country: USA
Vessel Model: Atlas Pompano 23
Join Date: Aug 2012
Posts: 5,487
Quote:
Originally Posted by BobnDoc View Post
At wot of 3100 rpm she did 17 knots. At what the PO called fast cruise (2800rpm) she did 14 knots.

That engine is rated for 3,300 rpm and if your reported wot rpm is accurate, ie phototach calibrated, then you are 300 rpm over propped. That engine definitely doesn't like to be over propped. Many reports of valves dropped at high loads.



Calibrate your tach if necessary and check again your wot rpms. If really 3,100 then take at least 2" of pitch off of the props to speed it up.


David
DavidM is offline   Reply With Quote
Old 03-31-2019, 07:30 PM   #290
Senior Member
 
City: Lutz
Country: USA
Join Date: Jan 2016
Posts: 460
The majority on here will say 8mph 8mph 8mph I say 8mph 8mph.
geoleo is offline   Reply With Quote
Old 03-31-2019, 08:29 PM   #291
Guru
 
MurrayM's Avatar
 
City: Kitimat, North Coast BC
Country: Canada
Vessel Name: Badger
Vessel Model: 30' Sundowner Tug
Join Date: Jul 2012
Posts: 6,432
Quote:
Originally Posted by tallswede View Post
Well, I for one appreciate the folks willing to give speed and fuel burn numbers. I gives me at least an idea what to expect from my new (to me) trawler as I learn how it performs...
We have a Yanmar 4JH2 100hp engine (a tad too big methinks, put in by the PO) that we cruise ar 2700 rpm. This gives us between 6.5 to 7.5 knots depending on conditions, at a bit less than 1.5 gallons per hour.

The PO put in an extra 40 gallon fuel tank for a total of 140 gallons, so we have pretty good range.
__________________
"The most interesting path between two points is not a straight line" Murray Minchin
MurrayM is offline   Reply With Quote
Old 03-31-2019, 08:38 PM   #292
Guru
 
cardude01's Avatar
 
City: Victoria TX
Country: USA
Vessel Name: Bijou
Vessel Model: 2008 Island Packet PY/SP
Join Date: Nov 2012
Posts: 4,711
I like to cruise at about 6.5 knots with the steady sails up.

Or 7 knots if Iím a hurry.
cardude01 is offline   Reply With Quote
Old 03-31-2019, 11:57 PM   #293
Veteran Member
 
BobnDoc's Avatar
 
City: Edmonds WA
Country: USA
Join Date: Feb 2018
Posts: 64
Quote:
Originally Posted by djmarchand View Post
That engine is rated for 3,300 rpm and if your reported wot rpm is accurate, ie phototach calibrated, then you are 300 rpm over propped. That engine definitely doesn't like to be over propped. Many reports of valves dropped at high loads.



Calibrate your tach if necessary and check again your wot rpms. If really 3,100 then take at least 2" of pitch off of the props to speed it up.


David


David
Thanks for the info. The mechanical surveyor is going to be making a few adjustments before we head south. Iíll ask him to recheck the calibrations. If they remain the same Iíll follow up with it when we get her home. If we can speed her up all the better.
Regards Bob
BobnDoc is offline   Reply With Quote
Old 04-01-2019, 01:41 AM   #294
Guru
 
North Baltic sea's Avatar
 
Country: Finland
Vessel Model: Nordic Tug 37
Join Date: Sep 2015
Posts: 940
Hi,

6,3kn-7nm/gal is my NT-37 eco cruise speed and if douple fuel consuptions i can run ~7,8 kn, hull speed is 8,2 - 3nm/gal...

And fast cruise speed 14-15kn 1,1 nm/gal


NBs
North Baltic sea is offline   Reply With Quote
Old 04-01-2019, 02:05 AM   #295
Guru
 
Simi 60's Avatar
 
City: Queensland
Country: Australia
Vessel Model: Milkraft 60 converted timber trawler
Join Date: Jul 2016
Posts: 2,719
Quote:
Originally Posted by Woodland Hills View Post
We have a 63í lwl and I cruise at 1050 rpm at 10/11 gph total which typically gives 9.7/10 kts. .
Thanks for that .
Simi 60 is offline   Reply With Quote
Old 04-01-2019, 06:26 AM   #296
Guru
 
City: Canaveral
Country: USA
Join Date: Jun 2012
Posts: 1,803
Nice to see this old thread come back. Interesting info.

My panga was a planing boat but we cruised about 14 knots, inshore. When it got choppy out however my wife wouldn't be comfortable until we dropped to about 8 knots.

On my big boat 65ft, 55+ tons, I cruised 8.25 knots and never varied except to dock. Couldn't go any slower anyway since the Jimmies were at about 1300+ rpm and wouldn't want to slow them down any. I remember looking around for smaller injectors than the 55's so I could derate them a bit.
makobuilders is offline   Reply With Quote
Old 04-01-2019, 08:24 AM   #297
Veteran Member
 
City: Green Cove Springs
Country: USA
Vessel Name: Nomad
Vessel Model: Chris Craft Commander 55
Join Date: Jan 2019
Posts: 88
8v71n Detroits pushing 70,000lb displacement, 7.5kt @ 1100rpm yields nearly 2nm/g. 1800 rpm is 12kt and a lot more fuel.
Commander Nomad is offline   Reply With Quote
Old 04-01-2019, 08:37 AM   #298
Guru
 
Woodland Hills's Avatar
 
City: Jacksonville
Country: USA
Vessel Name: Alzero
Vessel Model: Hatteras 63' CPMY
Join Date: Apr 2017
Posts: 1,492
Quote:
Originally Posted by makobuilders View Post
Nice to see this old thread come back. Interesting info.

My panga was a planing boat but we cruised about 14 knots, inshore. When it got choppy out however my wife wouldn't be comfortable until we dropped to about 8 knots.

On my big boat 65ft, 55+ tons, I cruised 8.25 knots and never varied except to dock. Couldn't go any slower anyway since the Jimmies were at about 1300+ rpm and wouldn't want to slow them down any. I remember looking around for smaller injectors than the 55's so I could derate them a bit.
Are you saying that you idle at 1300+ rpm? My V12s idle at 650rpm and around 6.5kts, do 6-71s idle twice as fast?
Woodland Hills is online now   Reply With Quote
Old 04-01-2019, 09:39 AM   #299
Guru
 
City: Canaveral
Country: USA
Join Date: Jun 2012
Posts: 1,803
No I was unclear. I cruised at 1300 rpm which was about 30% power, if I recall correctly. Wouldnít want to run the engines any lower than that. Idle speed was about same as yours
makobuilders is offline   Reply With Quote
Old 04-01-2019, 09:54 AM   #300
Guru
 
Woodland Hills's Avatar
 
City: Jacksonville
Country: USA
Vessel Name: Alzero
Vessel Model: Hatteras 63' CPMY
Join Date: Apr 2017
Posts: 1,492
We cruise at low rpm for economy, but periodically run them up for 1/2 hour or more to burn the moisture out of the oil. Folks say it’s to “burn out the carbon”, but that happens pretty quickly, it takes surprisingly long to get them fully up to temp and evaporate any condensation in the oil.
__________________

Woodland Hills is online now   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Hull speed duckcaptainbill Marlow - Mainship 4 03-02-2012 12:08 AM
Your speed at idle markpierce Power Systems 34 10-28-2011 07:19 PM
speed seal skipperdude General Discussion 23 08-04-2010 03:25 PM
Spray at Speed Marin Grand Banks 1 11-24-2008 12:32 PM




All times are GMT -5. The time now is 07:20 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×