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To bad most people decrease pitch to gain top speed...

Wait a minute .. Where did you get this first 15 number ? How did you calculate it ? Measured ? Measure on what ? How did you get a 20 ? Ddid you bent the hub ? I need help to understand it , Can anybody. educate me on this please , Thank you

Funny is I have a 1989 25hp evinrude with a 10.3 X 12p wot rpm 4500. 21.3 mph across lake. Topper Trapper 15.5 650 lbs one person. My engine power is 4500 to 5500rpm . I ordered a solas Amita 10.8 x 10p the evinrude dealer expects it to gain 1000 rpm. I watch on the RUclips This old outboard and with the 13 spline propeller and 25hp he was testing with a 9p and 10p 9"prop with the 25 evinrude 27mph with crazy fast get and using the 10p. Both engines are in 89 88 year range.

I’m running a 14.5 x19 3 blade and want to switch to a 4 black 21 pitch blade would this be bad or good I want good low end mid range because I ski and wake board but I was thinking the 21 pitch wouldn’t kill much of my top speed lose.. is this combination good?

Thanks Sir

Thank you sir well explained 🍻

Great information! I got 3.0 Merc with 14.5x19 prop, damaged it, got 14.5x21 prop for 60$ locally, I assume I won't be damaging my engine?

I have a 60hp merc that the rpm only hits 4100 rpm wot the prop is 10.5 x 13 what would be a good prop?

Does elevation impact how you choose a propeller? I was told the higher your elevation the higher pitch you need. Is that not correct?

so just keep buying props till your happy?

I bought one off eBay and have been using it for several years Now. I’m a independent cruising sailor and do all my own canvas work. It’s been a lifesaver.

To the point , no bla bla. Thanks.

Is it fair to say that we can work out the approximate flow rate from the pitch and RPM? Putting aside the hub diameter for the moment: pi * r^2 * pitch * rpm = cubic inches per minute? (and of course cubic mm if doing metric mm measurements)

I have a Tohatsu 40 hp 3-cylinder 2-stroke since it is a boat 460 meters deep semi-vy with 3 people plus day fishing things it does not go beyond 5200 rpm, propeller 10 1/4 14........ .should I take a step down? could you change x a propeller 11 1/8 13? I appreciate information! thank you

Thanks. Nice short brief video

To gain hole shot or increase your RPMs, decrease your pitch. To gain top speed or decrease your RPMs, increase your pitch. Finally it makes sense!

I bought one of these and when they welded the pieces to the vice grip they do not line up right and it dose a poor job of mounting the snap to the cloth or what ever