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26 July 2005, 10:48
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#61
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Member
Country: UK - England
Town: Over here
Boat name: S.S. Nobstick
Make: Three Wise Monkeys
Length: 3m +
Engine: 44lbs of thrust....
Join Date: Nov 2003
Posts: 2,127
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Throw the old pig-iron away and buy a couple of nice, shiney outboards? 
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26 July 2005, 11:13
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#62
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Member
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 5,596
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Nah, I bought 350kwids worth of fuel last January and I've still got plenty left.
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JW.
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26 July 2005, 11:54
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#63
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Member
Country: UK - England
Town: Lymington
Boat name: Farfetched
Make: Solent Ribs
Length: 6m +
Engine: 150hp Suzuki
MMSI: 235021048
Join Date: Apr 2004
Posts: 963
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Quote:
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Originally Posted by Searider
This seems to be the case with my 6.5m with a 150hp but you can't hold full throttle for too long. 900kg, 150hp = 166hp / ton.
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I have a similar ratio and can sit at full throttle in appropriate conditions without any problems - except fuel consumption. Why am I not having the same problem?
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26 July 2005, 13:17
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#64
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Member
Country: UK - England
Town: Nutbourne
Boat name: Renegade
Make: Porter
Length: 6m +
Engine: 140 Tohatsu
MMSI: 235022904
Join Date: Dec 2003
Posts: 1,195
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Quote:
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Originally Posted by brucehawsker
I have a similar ratio and can sit at full throttle in appropriate conditions without any problems - except fuel consumption. Why am I not having the same problem?
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Bruce.
Don't go looking for any more problems, you seem to have had more than your fair share already.
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Mark H
"A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools" Douglas Adams
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26 July 2005, 13:19
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#65
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Member
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,866
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Quote:
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Originally Posted by Mark Halliday
Bruce.
Don't go looking for any more problems, you seem to have had more than your fair share already. |
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26 July 2005, 18:51
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#66
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Member
Country: Canada
Town: Iqaluit, Nunavut
Boat name: Turaagaq -North Star
Make: Bombard WB 385 -2002
Length: 3m +
Engine: Mercury 25 4-Stroke
Join Date: May 2005
Posts: 58
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Very interesting discussion I've now got a better understanding of the different RIB designs out there. With my setup I think I'm at 125HP/Ton if it only weights 184KG empty which would indicate I am underpowered especially once I add ballast. What type of load should I strap to the bow, about 80KG? My sponsons are barely touching the water at the transom. I'd like to get a Searider 6+M eventually then I won't be bobbing around like a cork as much. Still a great little boat for now though.
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26 July 2005, 21:26
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#67
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Member
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
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Our leisure boat is about 180hp per ton and the raceboat is 210hp per ton - that is both without fuel ..............
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Cookee
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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27 July 2005, 01:13
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#68
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Member
Country: Australia
Town: Sydney
Make: Gemini
Length: 5.05
Engine: 85hp Yamaha
Join Date: Jun 2003
Posts: 105
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just think... the amount of combined time spent writing and reading all this- you could have been out on the water feeling the waves skip merrily below (or around) your tubes rather than trying to imagine it.
Just food for thought... 
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27 July 2005, 10:21
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#69
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Member
Country: UK - England
Town: Southampton
Boat name: SMH Rib / War Shot
Make: Ribtec / Scorpion
Length: 4m +
Engine: 100hp Yam/150hp opt
Join Date: Sep 2003
Posts: 2,069
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Quote:
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Originally Posted by brucehawsker
I have a similar ratio and can sit at full throttle in appropriate conditions without any problems - except fuel consumption. Why am I not having the same problem?
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Hi Bruce - I was meaning when it gets a bit rough!
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27 July 2005, 10:22
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#70
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Member
Country: Ireland
Town: Enfield, Co Meath
Boat name: no name
Make: Zodiac Pro
Length: 6m +
Engine: Suzuki 115
Join Date: Sep 2004
Posts: 120
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[QUOTE=EdwardH] just think... the amount of combined time spent writing and reading all this- you could have been out on the water feeling the waves skip merrily below (or around) your tubes rather than trying to imagine it.
WHAT?!? In the middle of the night ??? ohhh - of course that would be day for you....
What I dont understand is how y'all dont fall out of the ribs in Australia - what with being upside down on the bottom of the earth....
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27 July 2005, 10:24
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#71
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Member
Country: UK - England
Town: Southampton
Boat name: SMH Rib / War Shot
Make: Ribtec / Scorpion
Length: 4m +
Engine: 100hp Yam/150hp opt
Join Date: Sep 2003
Posts: 2,069
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Quote:
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Originally Posted by jwalker
But on the other hand, when the power to weight is high, the rib is more responsive. For my own part, I find driving my bigger (heavier) diesel powered rib a good deal more difficult especially if the going gets rough.
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I guess then that once over a certain size things start to change. Also hadn't thought about having to keep a turbo spinning.
Not as simple as it all sounds.
Perhaps there's an optimum size / engine / power to weight that makes things easy?
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27 July 2005, 15:19
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#72
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Member
Country: UK - England
Town: nr Lymington
Boat name: JU-JU
Make: Halmatic PAC22
Length: 6m +
Engine: 140.5 Mermaid
Join Date: Sep 2003
Posts: 1,400
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[QUOTE=Searider]......Also hadn't thought about having to keep a turbo spinning..../QUOTE]
Maybe one advantage of a jet boat  set and leave the engine revs and then only adjust the direction of thrust  Des
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27 July 2005, 23:20
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#73
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Member
Country: UK - England
Town: scotland
Boat name: Leviathan
Make: Phantom
Length: 8m +
Engine: GM Diesels
Join Date: Jan 2003
Posts: 1,437
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[QUOTE=lc0021]
Quote:
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Originally Posted by EdwardH
What I dont understand is how y'all dont fall out of the ribs in Australia
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I'm sure they do, after all, it's pretty common here innit
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28 July 2005, 09:20
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#74
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Member
Country: Ireland
Town: Enfield, Co Meath
Boat name: no name
Make: Zodiac Pro
Length: 6m +
Engine: Suzuki 115
Join Date: Sep 2004
Posts: 120
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oh yeah..... that's right... 
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29 July 2005, 04:11
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#75
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Member
Country: Australia
Town: Sydney
Make: Gemini
Length: 5.05
Engine: 85hp Yamaha
Join Date: Jun 2003
Posts: 105
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[QUOTE=lc0021]
Quote:
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Originally Posted by EdwardH
just think... the amount of combined time spent writing and reading all this- you could have been out on the water feeling the waves skip merrily below (or around) your tubes rather than trying to imagine it.
WHAT?!? In the middle of the night ??? ohhh - of course that would be day for you....
What I dont understand is how y'all dont fall out of the ribs in Australia - what with being upside down on the bottom of the earth....
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we do... frequently... but then the waters much much warmer so we don't really care...
middle of winter at the moment
http://www.smh.com.au/weather/sydney.html
a comfortable 20 degrees...
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War Shot
