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Old 02 December 2022, 14:28   #1
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Country: USA
Town: Norwalk, CT
Boat name: Little Wing
Make: Zodiac
Length: under 3m
Engine: Mercury, 9.9 HP 2T
Join Date: Dec 2022
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Zodiac Cadet RIB 270 ALU Prop size

I need propeller size recommendations, I have a brand new Cadet RIB 270 Aluminum Hull PVC with a 1995 Mercury 9.9 2 Smoker (15 HP Block) right now I'm running a 9 Pitch, topping out at 28 MPH with just me, 6 gallons of fuel and some throwable and life jackets, so a lighter load, but I'm looking for better top speed, fuel economy and cruise speed, I have a 10 Pitch Stainless Steel propeller on order and I wonder if that'll improve my top end by a little bit, Right now I'm running a 9 Pitch Aluminum, Both are three bladed.
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Old 02 December 2022, 18:37   #2
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Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Tohatsu 9.8 2-stroke
Join Date: Nov 2007
Posts: 7,599
Hi and welcome to the forum. I've had a few examples of that motor and they're great. Always kept to the standard 9" pitch but never had it on a hull as slippery as yours is likely to be. So yes it may be you get a better overall result from a 10" and the stainless could help a bit too.

However as we always advise you need to fit a cheap TinyTach so you know your revs to see if you are/will be making near max revs but not over-revving.
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Old 02 December 2022, 19:11   #3
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Country: USA
Town: Norwalk, CT
Boat name: Little Wing
Make: Zodiac
Length: under 3m
Engine: Mercury, 9.9 HP 2T
Join Date: Dec 2022
Posts: 5
RIBase
Yeah I have a Tiny-Tach installed on the motor, I'm gonna run tests with both props once the boat's back in, with my 9P im getting 6100 RPM, I wanna down it by about 100 RPM or more while getting more top speed.
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