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Old 20 July 2009, 23:06   #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, 18:13   #2
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Country: Ireland
Boat name: Bullfrog
Make: DSB - Osprey
Length: 5m +
Engine: Outboard, Petrol, 55
Join Date: Aug 2008
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, 18:18   #3
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Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
5500rpm is about right for a DT55, so stick with a 14" pitch.
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Old 27 July 2009, 15:03   #4
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Country: UK - England
Town: Southwold
Make: Avon
Length: 5m +
Engine: 2x55hp Evin pet
Join Date: Apr 2009
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 27 July 2009, 20:05   #5
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Country: Ireland
Boat name: Bullfrog
Make: DSB - Osprey
Length: 5m +
Engine: Outboard, Petrol, 55
Join Date: Aug 2008
Posts: 35
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, 01:49   #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
Posts: 5,217
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 30 July 2009, 20:42   #7
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Country: UK - England
Town: sheffield
Boat name: blue marlin
Make: avon 620 adventura
Length: 6m +
Engine: 150 hp suzuki
Join Date: Aug 2004
Posts: 146
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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