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Old 04 July 2020, 06:53   #1
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Country: Ireland
Town: New Ross
Boat name: SIRIUS
Make: Ribcraft 4.8M
Length: 4m +
Engine: 60HP Mariner EFi
MMSI: 250 005566
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what difference will an inch make

Just had to fit a new prop to my Mariner efi 60hp on my 4.8M Ribcraft, i am pretty sure the prop that was on the engine was the original one.

It was marked 10 38 13P, so i assume its a 10 inch diameter and a 13 pitch.

The Solas prop finder recommended the Amita 3 which is 11.1 inch diameter and 13 pitch.

Mercury prop finder shows a variety of prop sizes 13 pitch but diameters of 10.3- 10.5 inch.

Will i notice much difference with the solas prop. Haven't had chance to test yet as its windy as hell here in SE Ireland,

from Mercury prop selector below

Black Max® Mercalloy 3 10.375 13 RH 73136A40
Black Max® Mercalloy 3 10.5 13 RH 816704A40
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Old 04 July 2020, 09:15   #2
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Country: UK - England
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10 3/8 inch x 13 pitch I think you have what is your WOT RPM

1 inch dia is equal to 2 inch of pitch 1 inch of pitch equal to 150-200 RPM but can be as much as 400 RPM in certain cases although I've never expearianced it
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Old 04 July 2020, 10:22   #3
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Country: Ireland
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Length: 4m +
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MMSI: 250 005566
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wot was 5950 rpm
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Old 04 July 2020, 11:09   #4
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Just had a quick look 5500 to 6000 RPM so your bang on with current prop the solas theoretically brings the revs down a bit may be a tad slower you might not notice is my guess
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Old 04 July 2020, 11:21   #5
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Country: Ireland
Town: New Ross
Boat name: SIRIUS
Make: Ribcraft 4.8M
Length: 4m +
Engine: 60HP Mariner EFi
MMSI: 250 005566
Join Date: May 2018
Posts: 93
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Cheers thanks
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Old 12 July 2020, 06:14   #6
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Country: Ireland
Town: New Ross
Boat name: SIRIUS
Make: Ribcraft 4.8M
Length: 4m +
Engine: 60HP Mariner EFi
MMSI: 250 005566
Join Date: May 2018
Posts: 93
RIBase
and after being out today, with the new prop, i noticed no difference, compared to the old prop.
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Old 12 July 2020, 14:01   #7
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Result
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