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Old 04 June 2010, 13:20   #1
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prop pitch for 25hp efi

hello,
i have a 380 RIB + mercury 25hp 4stroke EFI.

current performance: max speed one person on board 22-22,5 knots GPS, max revs cca 5400RPM.

now i have a stock 9,5 x 11 pitch alu prop.

i am looking for top speed and cruising, should i drop the pitch do 9"-10" to rev the engine to 5800-6000?
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Old 05 June 2010, 09:52   #2
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maybe 12-13 pitch? toi drop to 5000-5200 WOT and gain some speed?
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Old 05 June 2010, 16:49   #3
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Drop the pitch, approx 250rpm per pitch. You need to get the RPM up to get the full HP out of the engine. I would put the 9" pitch on.
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Old 05 June 2010, 18:59   #4
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you think that i will be faster with 9" prop?
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