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Old 07 April 2019, 15:35   #1
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20hp outboard on Honwave t40

I need a new prop for my 20hp 4 stroke outboard, if I go up a pitch from standard prop it came with would it give me a higher top speed or would it be geared too high as such and make things worse.
I don’t know what WOT revs I’m doing as don’t have the gear to find out
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Old 07 April 2019, 16:04   #2
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I donít know what WOT revs Iím doing as donít have the gear to find out
And there's the problem - we need this info.

You'll need to know the current WOT revs and the recommended max rev for your engine. After that, prop decisions will be relatively simple...

Tip: "Tiny-tach"
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Old 08 April 2019, 01:12   #3
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Hi alexwalms I have the Honwave T40 with Suzuki 20hp it runs on a 12 pitch prop full of gear and fuel no problems
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Old 08 April 2019, 01:16   #4
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Thanks, I’ll order one up. Are they easy to fit?
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Old 08 April 2019, 01:20   #5
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Yip split pin and turn castle nut and your there I would recommend a new split pin
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Old 08 April 2019, 02:21   #6
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What pitch do you have at the moment Alex?
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Old 08 April 2019, 04:11   #7
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alex
rise in top speed will be minimal i have 10,11,12 for my suzuki 11 being the standard
i use the 10 more than the other two because i have more response from the engine 25HP keeping it on the plane in the rough. speed wise there's 2 knots difference between them with my set up revs increase decrease between 150-200 rpm per inch of pitch i'm up at 5800 ish rpm with the 10 and she will cruise at around 15 knots tops out at 20 knots with flat water
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Old 08 April 2019, 04:54   #8
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alex
rise in top speed will be minimal i have 10,11,12 for my suzuki 11 being the standard
i use the 10 more than the other two because i have more response from the engine 25HP keeping it on the plane in the rough. speed wise there's 2 knots difference between them with my set up revs increase decrease between 150-200 rpm per inch of pitch i'm up at 5800 ish rpm with the 10 and she will cruise at around 15 knots tops out at 20 knots with flat water
Have you experimented with four blade instead of 3? Maybe a four blade 11 Would work well?
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Old 08 April 2019, 05:25   #9
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Have you experimented with four blade instead of 3? Maybe a four blade 11 Would work well?


The OP might struggle to find a 4blader in such a small pitch, theyíre few & far between. Steel developments have a couple of 10Ē, but it depends on the gearcase.
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Old 08 April 2019, 06:01   #10
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Standard prop on the 2018 Honda 20hp is 4 blade.... I’ll check what pitch is standard when I’m home.
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