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Old 25 October 2007, 07:20   #1
DJL
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Country: UK - England
Make: Ribcraft 6.5
Length: 6m +
Engine: Suzuki DF175TG
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4 blade propellers

Does anyone on here have experience of 4 blade props on RIBs?

I'm currently running a 21" standard Yamaha black steel 3 blade on my Yam F150. WOT is ~5300 @ 42kts.

I'm after better grip, especially in rough water.

I'm thinking of a SS 19" 4 blade - should give me another ~200 RPM.
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Old 25 October 2007, 07:24   #2
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Boat name: stramash
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I changed from a stainless 21" 3 blade to a stainless 21" 4 My RPM went down slightly top speed was the same, but grip improved in turns, and in rough, but not for hole shot
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Old 25 October 2007, 07:34   #3
DJL
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Quote:
Originally Posted by Bigmuz7 View Post
I changed from a stainless 21" 3 blade to a stainless 21" 4 My RPM went down slightly top speed was the same, but grip improved in turns, and in rough, but not for hole shot
Intresting - I thought hole shot would improve, although you stayed at the same pitch which might explain it.
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Old 26 October 2007, 08:54   #4
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More blades generally mean fewer revs, as does an increase in Diameter, so it might actually slow you down - how high is the engine on the transom? It might help if you lower the engine by one bolt hole. Also take a good look at the prop, a slight nick in a blade can also cause this - it might help to send it away for a tune up and balancing if it has had a hard life!
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Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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