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Old 30-09-2020, 08:52   #1
Marine Service Provider

Join Date: May 2011
Location: PDX
Boat: Gulfstar 50
Posts: 1,960
Typical prop pitch

Hi All,

Time to replace the prop on out dinghy's outboard. I was wondering what pitch you have on your outboard.

To this end I am thinking along the lines of less pitch for more push but less top speed. (9.25 x 9 vs 9.25 x 10 or 11)

Of course the details are important. Johnson 9.9 2 stroke with a 2.4:1 reduction lower end mounted on a 3.1m Zodiac Cadet 310-AL inflatable.

So, what have you got?

From some rough calculations the top end is 15 Kt with the 9" and closer to 20 with the 11". Of course slip is a major unknown but factored in.
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