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Old 28 October 2011, 15:11   #11
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Country: UK - N Ireland
Town: Rostrevor
Boat name: Ricochet
Make: Redbay
Length: 7m +
Engine: Twin F115 Yams
MMSI: 235083269
Join Date: Oct 2011
Posts: 911
Nice shiny prop in your picture there ribochet!!!!![

Thanks - 1 off 2
In my experience the 4 bladed props have give me a lot more grip - less slippage, more stern lift and better fuel fuel consumption at cruising speed

Thanks for the info guys, would I go for the same pitch on the four bladed as I'm running on the 3 or would I go smaller?

Changing from a 3 blade to a 4 blade prop will definitely reduce your WOT rpm - I would suggest by 250 rpm. Another factor to consider is how "agressive" are the blades of your existing prop in terms of cupping and rake in relation to your proposed new prop.
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Old 05 November 2011, 12:58   #12
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Country: UK - England
Town: Newcastle-upon-Tyne
Boat name: Stancarlos
Make: Tornado 6.5
Length: 6m +
Engine: Suzuki DF150
Join Date: Jul 2011
Posts: 15
RIBase
hi,

I have just resently gone from 19" 3 blade to 17" 4 blade stainless.

My thing is diving so involves pushing a lot of gear and people. The difference I have noticed is similar to what Ribochet is saying. I now have better stern lift and the boat planes at lower revs. Now when I am in a heavy sea I have noticed my boat doesn't get knocked back down off the plain as easy.

I don't use WOT very much but I gave it a 'blast' today and WOT throttle was almost identical in revs and speed as I was seeing with the 19".
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