Reply
 
Thread Tools Search this Thread
 
Old 09 November 2007, 20:37   #1
Member
 
Country: Other
Town: Oakley
Boat name: Zerstörer
Make: Ribcraft
Length: 5m +
Engine: Suzuki DF 140
MMSI: 235050131
Join Date: Jun 2003
Posts: 3,931
Cruising RPM

Whats a good engine REV speed to cruise at. I keep my engine around the 4500 RPM mark for cruising but sometimes it seems a little slow. Is 5000 RPM a fair enough speed for cruising.

I ask because 5000 RPM on a car would be harsh.
__________________

__________________
http://www.xfire.com/download/
Biggles is offline   Reply With Quote
Old 09 November 2007, 20:41   #2
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
Quote:
Originally Posted by Biggles View Post
Whats a good engine REV speed to cruise at. I keep my engine around the 4500 RPM mark for cruising but sometimes it seems a little slow. Is 5000 RPM a fair enough speed for cruising.

I ask because 5000 RPM on a car would be harsh.
Depends on your redline really. Mine's recommended 4.5-5.5k max at WOT so cruising at 5k is caning it.

I cruise at around 2/3 to 3/4 max rpm.
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 09 November 2007, 20:47   #3
Member
 
Country: Other
Town: Oakley
Boat name: Zerstörer
Make: Ribcraft
Length: 5m +
Engine: Suzuki DF 140
MMSI: 235050131
Join Date: Jun 2003
Posts: 3,931
My engine maxes at 6200 therefore Your saying between 4650 and 4687 RPM. So 4500 isn't too far out. I'll maybe run just a little above that on my analogue gauge.

I ran at 5000 on 10 June when we went to the Dancing Ledge and I surprisingly got a good fuel consumption and didn't seem to be caning it.
__________________
http://www.xfire.com/download/
Biggles is offline   Reply With Quote
Old 09 November 2007, 20:57   #4
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
Quote:
Originally Posted by Biggles View Post
between 4650 and 4687 RPM.

Ah. Didn't realise it was actually such a narrow band-I actually cruise around 3.5-4.2k rpm but it looks like 2/3 to 3/4 rpm when I'm glancing at the revcounter.

Realistically it equates to about 22-28 knots with WOT being 36-39 knots depending on load.
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 10 November 2007, 03:48   #5
RIBnet admin team
 
Poly's Avatar
 
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: 2 stroke YAM 20 HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 10,114
Quote:
Originally Posted by Nos4r2 View Post
Didn't realise it was actually such a narrow band
I don't think it is! Biggles is needing to get his calculator serviced.

2/3 x 6200 = 4133 rpm
3/4 x 6200 = 4650 rpm
__________________
Poly is offline   Reply With Quote
Old 10 November 2007, 04:44   #6
Member
 
Andy Moore's Avatar
 
Country: UK - England
Town: Cowes, Isle of Wight
Boat name: TiLT 2
Make: Avon Adventure 620
Length: 6m +
Engine: Optimax 135
MMSI: 235032203
Join Date: Sep 2005
Posts: 1,639
We tend to cruise at around 5000 RPM. By the sound of it the outboard is getting a good workout at those Revs. However, bearing in mind that one is only running like that for 10-15mins at a time, I reckon its okay.

Max Revs is c. 600RPM.
__________________
RIBnet: now available on Facebook!
Andy Moore is offline   Reply With Quote
Old 10 November 2007, 07:29   #7
Member
 
Country: Other
Town: Oakley
Boat name: Zerstörer
Make: Ribcraft
Length: 5m +
Engine: Suzuki DF 140
MMSI: 235050131
Join Date: Jun 2003
Posts: 3,931
Quote:
Originally Posted by Andy Moore View Post
However, bearing in mind that one is only running like that for 10-15mins at a time, I reckon its okay.
I wouldn't call that cruising though. I would say about 30 minutes at least constant running would be cruising ! Maybe even more.
__________________
http://www.xfire.com/download/
Biggles is offline   Reply With Quote
Old 10 November 2007, 07:30   #8
Member
 
Country: Other
Town: Oakley
Boat name: Zerstörer
Make: Ribcraft
Length: 5m +
Engine: Suzuki DF 140
MMSI: 235050131
Join Date: Jun 2003
Posts: 3,931
Quote:
Originally Posted by Polwart View Post
I don't think it is! Biggles is needing to get his calculator serviced.

2/3 x 6200 = 4133 rpm
3/4 x 6200 = 4650 rpm
Maths never was my strong point.
__________________
http://www.xfire.com/download/
Biggles is offline   Reply With Quote
Old 10 November 2007, 09:02   #9
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
Quote:
Originally Posted by Biggles View Post
Whats a good engine REV speed to cruise at. I keep my engine around the 4500 RPM mark for cruising but sometimes it seems a little slow. Is 5000 RPM a fair enough speed for cruising.

I ask because 5000 RPM on a car would be harsh.
I was told you Solent boys cruise at 40kts
__________________
Downhilldai is offline   Reply With Quote
Old 10 November 2007, 09:17   #10
Member
 
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,841
Quote:
Originally Posted by Downhilldai View Post
I was told you Solent boys cruise at 40kts
Yep, I've heard that aswell.
__________________

__________________
Mollers 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 00:45.


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