Suzuki DF25 prop

[ashwatkins]

Im looking for a spare/replacement. Its currently fitted with a 10 1/4 x 11, which Im happy with. Can anyone recommend a place to buy a replacement that wont cost a fortune. This is my first time buying one so Im not sure what Im looking for! Also whats the benefit/shortfalls of a 4 blade over a 3 blade?

[jeffstevens763@g]

i,ve just bought one from pacermarine 10 1/4 x 10 £96 prior to that i bought a 10 1/4 x 12 £62 from SSI MARINE OUTBOARDS non japan make but ran it for 2 weeks with no probs.

[jeffstevens763@g]

a 4 blade prop will give more thrust at low speeds and more acceleration but will go at a cost of top speed.
ss props will give you about 5% more efficiency at double the cost of ali props steel developments quoted me £220 inc vat & delivery for a 10 x 10

[ashwatkins]

Thanks for the advice. In laymans terms what would be the difference in a 10, 11 or 12?

[jeffstevens763@g]

Originally Posted by ashwatkins

Thanks for the advice. In laymans terms what would be the difference in a 10, 11 or 12?

If meaning the second number which is the pitch for every inch of pitch you increase or decrease RPM by About 200 so if you are on 5500 RPM WOT with an 11 inch pitch going down to a 10 will give you 5700 RPM WOT.
Speed wise I lost 0.5 knots changing from an 11 inch to a 12 inch 22 knots down to 21.5 knots

[ashwatkins]

Ah cool. Thank you!

[jeffstevens763@g]

https://www.propeller-shop.eu/propeller-info/

this is very helpful as you read it you will find it's not an exact science they do quote on smaller engines up to 30 hp that RPM can change by up to 500 RPM/inch of pitch i experienced 390 rpm difference from an 11 to a 12 pitch 5640 to 5250 that was done on separate outings so conditions may have had some bearing on the RPM
when i gave these figures to steel developments they suggested a 10 x 10 ss prop which would bring me up to around 5950 RPM which i thought would take me up to & on the rev limiter which i didn't want so i kept the diameter at 10 1/4 .
the reason for all this is i want the best response from the engine in the rough so i can maintain speed on the plane.
hope that helps