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Old 19 July 2018, 12:08   #1
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Country: UK - England
Town: Poole
Boat name: ORCA III
Make: bombard expl sb500
Length: 5m +
Engine: yamaha 60 efi
MMSI: 232016750
Join Date: Jun 2018
Posts: 20
Prop size?

Hi all,
I have a Bombard SB500 fitted with a 2004 Yamaha F60C.
prop size fitted is 11 1/2 x 18-g. aluminium.
Took boat out today in almost flat conditions, wot at 4700, not a 100% sure of speed as reading speed at 25mph was on yamaha instruments.
looking online i think max revs should be 5000/6000.
looks like i am 1000 short ,any suggestions on prop size, and stainless or ally.
Cheers Mick.
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Old 20 July 2018, 02:17   #2
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Country: UK - Scotland
Town: Isle of Lewis
Make: Ceasar Thundercat
Length: 4m +
Engine: Yamaha 70ces
Join Date: Jul 2010
Posts: 736
RIBase
Pretty sure it will say 13G not 18G, you could try dropping to 12 or even 11p and see how the revs go. Get the Speedometer app on your phone, it's very accurate
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