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Old 12 April 2005, 11:26   #1
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Country: Belgium
Town: Kluizen Ghent
Boat name: Spirit
Make: Ribtec
Length: 6m +
Engine: 90HP Honda
Join Date: Nov 2004
Posts: 28
I need some prop advice.

HI,
At this moment I use a alu .prop 17" on a Ribtec 585 with a Honda 90 HP.
Cruising speed 24 Kn at 4500 rpm -full trottle 32 kn at 5400 rpm.(Heavy load)
However I want to use the full powerband of the engine and I want to go
to 6000rpm.
Could that be possible with a 17" Stainless Steel prop?
Which brand,type should I order?
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Old 12 April 2005, 12:21   #2
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Country: UK - England
Town: Portchester
Boat name: South Coast Two
Make: Humber
Length: 5m +
Engine: 90
Join Date: Nov 2003
Posts: 89
Prop Size

Hi

On our boat a 5.3m Humber with a 90Hp 2 Stroke outboard. Aging Youth uses a 19inch S/S Laser II when trimmed right out and at WOT setting we maxed out at 5800rpm and 40knots recorded on the GPS. Just Ask Whiteshoes who was parallel with us on the last littlehampton cruise.

I know Mike C is hasving the same problem with prop selection and it is a lot of trial and error if you can afford it.

Good Luck.
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Old 12 April 2005, 12:44   #3
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Country: UK - England
Town: Fareham
Length: 6m +
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Would have thought that if you uprated your prop to a SS one of the same pitch your revs will drop, you could increase this a little by running the outboard at a greater height but I dought that you will increase revs beond what you've got. I think a smaller pitched SS one will be a better bet.


Andy
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Old 13 April 2005, 11:58   #4
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Country: UK - Channel Islands
Town: A large rock
Boat name: La Frette
Make: Osprey Vipermax
Length: 6m +
Engine: 200 Suzzy
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Sounds like you've got space for improvement. I've got a Suzuki 90 on my Prosport which is about 5.85m long and I get a good 35 knots with four adults in a smooth sea. Don't know the prop size but will be able to tell you later tonight after I get the boat out the water!
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Old 14 April 2005, 10:59   #5
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Country: Belgium
Town: Kluizen Ghent
Boat name: Spirit
Make: Ribtec
Length: 6m +
Engine: 90HP Honda
Join Date: Nov 2004
Posts: 28
Thanks for reply,
Just found somewone who's importing TP .props from the US.
He's got the whole range to testing with.
Erin, If you now the size of the prop give me a sign.

Regards Ribfisher
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Old 14 April 2005, 15:55   #6
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Country: UK - Channel Islands
Town: A large rock
Boat name: La Frette
Make: Osprey Vipermax
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Posts: 2,833
Hi Ribfisher

Mines a 3 blade 14x19. I thinks that's diameter x pitch.

Keith
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Old 20 April 2005, 11:34   #7
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Country: UK - Wales
Town: Sunny Ynys Môn
Boat name: Windchill 2
Make: Ring Powercraft 685
Length: 6m +
Engine: Suzuki DF 175
Join Date: Feb 2003
Posts: 150
Correct propping is a black art!!

Try these people www.steeldevelopments.co.uk They helped me out with my last RIB, and were not inordinately expensive.

There is actually a good article about props etc on the RIB International site.
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