Reply
 
Thread Tools Search this Thread
 
Old 04 May 2010, 09:53   #1
Member
 
Country: UK - England
Boat name: abymac three
Make: avon 560 adventure
Length: 5m +
Engine: 115 df
Join Date: Apr 2010
Posts: 48
engine revs

Hi all just a quick questian, asume travelling 3 hours continuousley with a 115 hp 4 stroke if max revs are 6000, at what sort of revs would i be at if driving 3 or 4 hours non stop or does it not matter , only , my son says run it at halfe revs if non stop , would be glad of advice..... regards
__________________

__________________
searover is offline   Reply With Quote
Old 04 May 2010, 11:02   #2
Member
 
chewy's Avatar
 
Country: UK - England
Town: Up Norf
Make: Avon SR4,Tremlett 23
Length: 4m +
Engine: Yam 55, Volvo 200
Join Date: Apr 2007
Posts: 5,217
If you reduce the revs by a couple of hundred you may lose a couple of knots but your fuel consumption will be alot better.
__________________

__________________
chewy is offline   Reply With Quote
Old 04 May 2010, 12:14   #3
Member
 
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
In theory, the engine should handle WOT rpm fine until you run out of gas. As Rover said, your pocketbook probably won't.

Select a comfortable planing cruising speed and let it go at that. If you want better economy, knock the rpms down a bit (but only to a point where the boat is comfortably on plane - struggling on the hump won't save you fuel.) If you want to get there faster, push the throttle forward.

jky
__________________
jyasaki is offline   Reply With Quote
Old 04 May 2010, 15:14   #4
Member
 
Country: UK - England
Boat name: abymac three
Make: avon 560 adventure
Length: 5m +
Engine: 115 df
Join Date: Apr 2010
Posts: 48
revs

Hi, guys thanks for the coments , ok then ill be happy at 3000 revs or lower as i was getting 22knotts at somewhere around there ,,, so then its on the plane then back off as much as i can to stay on the plane ,,great stuff thanks lads ... regards.
__________________
searover is offline   Reply With Quote
Old 04 May 2010, 15:28   #5
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,855
If you have a fuel meter that tells you exactly what the consuption is at any given throttle setting then using a gps to calculate your speed, it will quickly tell you what the most economical cruising speed is.

Otherwise do what I do and close your eye's when you come to pay for the fuel

The outboard should be happy at any RPM providing it's within the recommended range.
__________________
Andy

Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
Hightower is offline   Reply With Quote
Old 04 May 2010, 16:02   #6
Member
 
Bigmuz7's Avatar
 
Country: UK - Scotland
Town: Glasgow
Boat name: stramash
Make: Tornado
Length: 5m +
Engine: Etec 90
Join Date: Feb 2006
Posts: 5,068
Tbh I've always done about 65 - 80 % of max RPM for best mix of speed and economy for cruising depending on sea and size of hull
__________________

__________________
Bigmuz7 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 02:04.


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