Reply
 
Thread Tools Search this Thread
 
Old 07 January 2010, 05:01   #11
Member
 
Cypman's Avatar
 
Country: UK - Isle of Man
Town: Douglas
Length: no boat
Join Date: Aug 2006
Posts: 337
Cruising at circa 25kts in a Humber Ocean Pro 6.3m with a Suzy DF140 resulted in a fuel burn of around 17 ltrs. Even at 30kts I was bettering 1 ltr per mile.
__________________

__________________
Cypman is offline   Reply With Quote
Old 07 January 2010, 05:42   #12
Member
 
Channel Ribs's Avatar
 
Country: UK - Channel Islands
Town: Alderney
Length: no boat
Join Date: Sep 2006
Posts: 3,047
Thanks for all the responses so far, this will also really help with the Alderney Cannonball Challenge.

Summary so far:-

Zubenelgenubi: 30nm:25L @30kn (90 2/S) = 0.83 lpm
9D280: 35nm:30L @20kn (25 4/S) = 0.86 lpm
9D280: 24nm:30L @mixed (55 2/S) = 1.25 lpm
Leapy: 46nm:26L @20kn (90 4/S) = 0.57 lpm
Cypman: ?nm:17L @25kn (140 4/S) = ?
Cypman: ?nm:? @30kn (140 4/S) = <1 lpm
__________________

__________________
Channel Ribs is offline   Reply With Quote
Old 07 January 2010, 06:45   #13
Member
 
Country: Ireland
Town: Castlebar
Boat name: Clewless
Make: Valiant DR 490
Length: 4m +
Engine: 60 hp ETEC
MMSI: Awaitng one
Join Date: Oct 2007
Posts: 1,239
RIBase
Etec 60 hp on DR 490 varies from 1.5 nm/ltr to 1.7 nm/lt at 18-20 kn

TSM
__________________
two stroke mick is offline   Reply With Quote
Old 07 January 2010, 06:54   #14
Member
 
Channel Ribs's Avatar
 
Country: UK - Channel Islands
Town: Alderney
Length: no boat
Join Date: Sep 2006
Posts: 3,047
Summary so far, with estimated 1:1 speeds in bold at the end:-

Zubenelgenubi: 30nm:25L @30kn (90 2/S) = 0.83 lpm 33kn
9D280: 35nm:30L @20kn (25 4/S) = 0.86 lpm 22kn
9D280: 24nm:30L @mixed (55 2/S) = 1.25 lpm 20kn
Leapy: 46nm:26L @20kn (90 4/S) = 0.57 lpm 25kn
Cypman: ?nm:? @30kn (140 4/S) = <1 lpm 35kn
TSM: ?:? @20kn (60 E) = 0.75 lpm 25kn

It seems fair to say that, so far, speeds of between 25 and 30 knots are realistic for most outboards.
__________________
Channel Ribs is offline   Reply With Quote
Old 07 January 2010, 07:14   #15
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,962
Something spooky about rib fuel consumption I reckon. My boats have done about 1lt a mile no matter what engine was on the back and even my current boat weighing in at about 3tons with a diesel still does about 1lt per mile.
Folk talk about how economical modern engines are, how 4 strokes are better that 2 strokes, how new tech 2s are better than old but they all seem to be around the 1lt/mile. Except Leapy, of course.

__________________
JW.
jwalker is offline   Reply With Quote
Old 07 January 2010, 07:23   #16
Member
 
Country: UK - Scotland
Town: Glasgow
Boat name: Thunder
Make: Halmatic Arctic 22
Length: 6m +
Engine: 2 x 150 Etec
Join Date: Oct 2008
Posts: 500
I get about 1.3 ltr/mile at 40 knots, no idea what speed I'd be going to get it to 1ltr/mile.
__________________
GordyP is offline   Reply With Quote
Old 07 January 2010, 07:25   #17
Member
 
Leapy's Avatar
 
Country: UK - England
Town: Sheepy Parva
Boat name: Sadly Sold
Length: no boat
Join Date: Sep 2008
Posts: 1,728
Quote:
Originally Posted by malthouse View Post
Leapy: 46nm:26L @20kn (90 4/S) = 0.57 lpm 30kn
Should be 20kn
__________________
Leapy is offline   Reply With Quote
Old 07 January 2010, 07:28   #18
Member
 
Leapy's Avatar
 
Country: UK - England
Town: Sheepy Parva
Boat name: Sadly Sold
Length: no boat
Join Date: Sep 2008
Posts: 1,728
Quote:
Originally Posted by jwalker View Post
Something spooky about rib fuel consumption I reckon. My boats have done about 1lt a mile no matter what engine was on the back and even my current boat weighing in at about 3tons with a diesel still does about 1lt per mile.
Folk talk about how economical modern engines are, how 4 strokes are better that 2 strokes, how new tech 2s are better than old but they all seem to be around the 1lt/mile. Except Leapy, of course.

All I can say about my own figures is that the measurements are tank brim full to tank brim full and the mileages comes from the GPS. The figures I quoted for that trip are consistent with the figures I've got for the whole of the boat ownership.

I'm happy with their accuracy
__________________
Leapy is offline   Reply With Quote
Old 07 January 2010, 07:29   #19
Member
 
Channel Ribs's Avatar
 
Country: UK - Channel Islands
Town: Alderney
Length: no boat
Join Date: Sep 2006
Posts: 3,047
Quote:
Originally Posted by Leapy View Post
Should be 20kn
Cheers Leapy, will you settle for 25 though as I am trying to adjust to the theoretical speed where 1:1 is reached?
__________________
Channel Ribs is offline   Reply With Quote
Old 07 January 2010, 07:30   #20
Member
 
Channel Ribs's Avatar
 
Country: UK - Channel Islands
Town: Alderney
Length: no boat
Join Date: Sep 2006
Posts: 3,047
Quote:
Originally Posted by GordyP View Post
I get about 1.3 ltr/mile at 40 knots, no idea what speed I'd be going to get it to 1ltr/mile.
You've never tried going 35 then?
__________________

__________________
Channel Ribs is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 15:32.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.