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04 August 2012, 18:54
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#1
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Member
Country: UK - Scotland
Town: Fort William
Make: Ribcraft 585
Length: 5m +
Engine: Yamaha F115
Join Date: Mar 2012
Posts: 2,896
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SR5.4 with Yam 50 4 stroke
Would the above be under powered?
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There is a place on this planet for all of Gods creatures.........right next to my tatties and gravy.
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04 August 2012, 19:18
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#2
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Member
Country: UK - Scotland
Length: 6m +
Engine: outboard 150
Join Date: Jan 2010
Posts: 70
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Quote:
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Originally Posted by A1an
Would the above be under powered?
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Yes very
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04 August 2012, 19:36
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#3
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Member
Country: UK - Scotland
Town: Fort William
Make: Ribcraft 585
Length: 5m +
Engine: Yamaha F115
Join Date: Mar 2012
Posts: 2,896
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ok cheers
__________________
There is a place on this planet for all of Gods creatures.........right next to my tatties and gravy.
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04 August 2012, 20:41
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#4
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Member
Country: Croatia
Town: pula
Make: zodiac medline 2
Length: 6m +
Engine: outboard, petrol 150
Join Date: Jul 2012
Posts: 5
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It wuld go 26-27 knots WOT 19-20 knots cruising speed.
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04 August 2012, 21:12
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#5
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Member
Country: UK - Scotland
Town: Fort William
Make: Ribcraft 585
Length: 5m +
Engine: Yamaha F115
Join Date: Mar 2012
Posts: 2,896
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Quote:
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Originally Posted by darko1307
It wuld go 26-27 knots WOT 19-20 knots cruising speed.
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Blimey, there is no fun in that!
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There is a place on this planet for all of Gods creatures.........right next to my tatties and gravy.
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05 August 2012, 06:23
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#6
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RIBnet admin team
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,054
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Quote:
Originally Posted by A1an
Blimey, there is no fun in that!
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That's solo with a light load too.
Realistically you want a minimum of 70hp on them for fun but 80 to 90 is far better.
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05 August 2012, 07:08
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#7
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Member
Country: UK - England
Town: Daventry & Beaulieu
Boat name: Tigga2
Make: Ribcraft 4.8
Length: 4m +
Engine: Honda BF50
MMSI: 235900806
Join Date: Jun 2011
Posts: 984
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I do some safety boat rescue work at a sailing club (inland) using SR 5.4's with Honda 50 4 strokes. Ideal setup for that particular job and economical, but would be very underpowered for tidal use.
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Chris Moody
Rib Tigga2 a Ribcraft 4.8 with a Honda BF50
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05 August 2012, 11:13
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#8
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Member
Country: Croatia
Town: pula
Make: zodiac medline 2
Length: 6m +
Engine: outboard, petrol 150
Join Date: Jul 2012
Posts: 5
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I have 5,7 m rib and merc 60 efi 4 stroke on it. 4 adults on board 18 knots at 4500 rpm 24 knots WOT. It is economic, 90 hp would be beter but 90 hp outboard is double price than 60 hp. Most of time it is 2 divers onboard and for that it is ok. Previus engine was evinrude 115 hp ficht and on 4000 rpm cruising speed was 23 knots but 20 l/h nov 19-20 knots on 4500 rpm and 10-11 l/h whit 60 hp merc.
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31 August 2012, 07:33
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#9
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Member
Country: UK - England
Town: Daventry & Beaulieu
Boat name: Tigga2
Make: Ribcraft 4.8
Length: 4m +
Engine: Honda BF50
MMSI: 235900806
Join Date: Jun 2011
Posts: 984
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Was working on a SR 5.4 this week with a Honda 50 4 stroke, so measured actual speed at WOT: 1 person, flat water, engine trimmed, 25 litres of fuel, 2 anchors. 26 kts.
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Chris Moody
Rib Tigga2 a Ribcraft 4.8 with a Honda BF50
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31 August 2012, 08:47
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#10
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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: 6,299
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I run an SR4.7 with a 50EFi Merc and it'll do 32-33kts with 2 on board. The 4.7 has exactly the same hull profile as the 5.4, so is essentially the same boat, but with a 700mm section chopped out of the hull, deck & tubes!
Make of that what you will, for comparison purposes.
Are you looking to replace your existing motor?
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