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Old 21 July 2009, 03:06   #1
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Country: Ireland
Boat name: Bullfrog
Make: DSB - Osprey
Length: 5m +
Engine: Outboard, Petrol, 55
Join Date: Aug 2008
Posts: 35
What Prop Should I Buy?

When I bought my rib last year the motor had a 11.6x14 solus 3 blade prop fitted. Due to wear & tear (and some steep learning curves of what NOT to do) I'm going to purchase a replacment prop.
My rib is a 5.5m Osprey (usually two up - Wife & Myself) she's powered by a Suzuki DT55 2stroke motor. At 5500rpm she delivers a speed of 20knots.

Is the current size/pitch correct for my boat? If not what would be a better size?
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Old 26 July 2009, 22:13   #2
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Country: Ireland
Boat name: Bullfrog
Make: DSB - Osprey
Length: 5m +
Engine: Outboard, Petrol, 55
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Posts: 35
Putting my question back to the top again - Has anyone got any advice before I go and buy a new prop??
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Old 26 July 2009, 22:18   #3
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Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
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5500rpm is about right for a DT55, so stick with a 14" pitch.
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Old 27 July 2009, 19:03   #4
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Country: UK - England
Town: Southwold
Make: Avon
Length: 5m +
Engine: 2x55hp Evin pet
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Posts: 20
Managed to established that our props on our two Evi 55hp powered ribs are 14 x 19.

(One searider 5.4 and one Humber 5.5)

Used two up, for sailing support, towing dingies in & out of the harbour.
Top speed of around 20knots

Please couls I have suggestions for suitable props.

Also we're considering getting prop guards, would this effect our choice in props?
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Old 28 July 2009, 00:05   #5
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Country: Ireland
Boat name: Bullfrog
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Length: 5m +
Engine: Outboard, Petrol, 55
Join Date: Aug 2008
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Yeah going by everything I'd read I thought the prop size already on the motor was pretty much suited for my boat.
It was just that I had my rib into a Marine Engineer to have an engine problem looked at - he said my motor was overproped. I should have asked him exactly what he meant, but didn't want to look stupid.

Thanks for the advice
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Old 28 July 2009, 05:49   #6
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Country: UK - England
Town: Up Norf
Make: Avon SR4,Tremlett 23
Length: 4m +
Engine: Yam 55, Volvo 200
Join Date: Apr 2007
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If your boat was over propped the pitch would be to course and you wouldn't reach max rpm. Your reaching max rpm so it looks like its ok.
You might gain a couple of knots with a nice stainless one?
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Old 31 July 2009, 00:42   #7
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Country: UK - England
Town: sheffield
Boat name: barracuda
Make: Humber 7.6 mts
Length: 7m +
Engine: 200HP mercury
Join Date: Aug 2004
Posts: 179
look at these props

hi
haveing had a osray with a 65hp 2 stroke i would recomend a 19" itch prop loook at
streamline props on ebay item no 200338623636 will get u onto there site..

phone them up with your boat and engine size for some advice they are very helpfull...

i have just bought a new s/steel prop for a 150hp suzuki at £130 i even phone them up as i thought i was qoted the wrong price as have seen other props for about £300

cheeper than 2ndhand and stainless steel

thanks

steve
sheffield
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