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10 November 2007, 00:37
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#1
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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
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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.
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10 November 2007, 00:41
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#2
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RIBnet admin team
Country: UK - England
Town: Swindon
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 239050687/235055163
Join Date: Jul 2005
Posts: 8,881
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Quote:
Originally Posted by Biggles
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.
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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.
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10 November 2007, 00:47
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#3
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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
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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.
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10 November 2007, 00:57
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#4
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RIBnet admin team
Country: UK - England
Town: Swindon
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 239050687/235055163
Join Date: Jul 2005
Posts: 8,881
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Quote:
Originally Posted by Biggles
between 4650 and 4687 RPM.
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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.
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10 November 2007, 07:48
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#5
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RIBnet admin team
Country: UK - Scotland
Town: Linlithgow
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: 2 stroke YAM 20 HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 5,855
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Quote:
Originally Posted by Nos4r2
Didn't realise it was actually such a narrow band
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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
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10 November 2007, 08:44
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#6
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Member
Country: UK - England
Town: Cowes, Isle of Wight
Boat name: Ditherer
Make: Avon Adventure 620
Length: 6m +
Engine: Optimax 135
MMSI: 235032203
Join Date: Sep 2005
Posts: 1,633
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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.
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10 November 2007, 11:29
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#7
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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
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Quote:
Originally Posted by Andy Moore
However, bearing in mind that one is only running like that for 10-15mins at a time, I reckon its okay.
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I wouldn't call that cruising though. I would say about 30 minutes at least constant running would be cruising ! Maybe even more.
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10 November 2007, 11:30
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#8
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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
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Quote:
Originally Posted by Polwart
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.
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10 November 2007, 13:02
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#9
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Member
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 5,358
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Quote:
Originally Posted by Biggles
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.
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I was told you Solent boys cruise at 40kts 
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10 November 2007, 13:17
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#10
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Member
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 6,047
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Quote:
Originally Posted by Downhilldai
I was told you Solent boys cruise at 40kts |
Yep, I've heard that aswell. 
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