Propeller: Difference?

muzkeepupz · 12 June 2017, 09:37

My Original Propeller that came with my Honda BF20 was SIZE 9 1/4 x 10 INCHES (235 x 254 mm), i purchased a spare one BUT forgot to mention the size to the supplier, they sent me SIZE 6 1/2 x 10 INCHES (165 x 254 mm).

What will be the difference in performance? Should i return it and ask for the right size or just keep it if its better size.

Again, thank you[emoji8][emoji8][emoji8]

Fenlander · 12 June 2017, 09:56

Which is the pitch and which the diameter?

In either case it's totally unsuitable and needs swapping.

muzkeepupz · 12 June 2017, 09:57

muzkeepupz · 12 June 2017, 09:57

This is my old one

muzkeepupz · 12 June 2017, 09:59

This is my new one

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muzkeepupz · 12 June 2017, 10:00

Sorry but really got no idea. I want to save time for returning and exchanging the propeller if the one i received is better. Thanks!

Fenlander · 12 June 2017, 10:08

OK I think it is likely the original one was a 9.25" dia and 10" pitch which is pretty standard for a 20hp and suits most situations.

Then it seems your new one is a 10" dia with a 6.5" pitch. You should be able to tell if the prop looks broadly the same dia as the old one to confirm this.

Assuming so 6.5" is a tiny pitch for a 20hp and like trying to drive on main roads in second gear. It would only suit a river boat or coastal launch that would never plane but needed 'lower gearing' to move a fair bit of weight.

muzkeepupz · 12 June 2017, 10:22

Wow, thanks for that very clear explanation. For that, i will return it to them. This forum is amazing specially when theres a member like you "Fenlander". Thank you so much

Fenlander · 12 June 2017, 10:31

No problem. I'm early retired and added to that undertake an activity in my spare time that needs frequent PC access through the day so if I know an answer I'm in there... if I don't I keep out and don't make it up!

jeffstevens763@g · 12 June 2017, 11:43

as fenlander said, are you happy with your old prop's performance what revs are you at WOT well within your rev range?

muzkeepupz · 12 June 2017, 11:46

Quote:

Originally Posted by jeffstevens763@g

as fenlander said, are you happy with your old prop's performance what revs are you at WOT well within your rev range?

The only reason im buying another propeller is i Badly scratched my propeller during my 1st use. Then, ill keep the scratch one as spare.