3 or 4 blades Crownline 180BR

[LarsMW]

Hello experts.
I have a Crowline 180BR with a 5.7 Volvo Penta with SX stern. I touch 50 knots with 4 blade but wonder if there is more to gain with a 3 blade. Any suggestions? Used on 90% flat freshwater and for some watersports and blowing off steam

 

[alldodge]

is more to gain with a 3 blade.

Maybe
First need some numbers.
What is current WOT RPM?
What is the pitch of current prop?
Do you know what the drive ratio is?

 

[jlh3rd]

yep....see attached.

 

[LarsMW]

Maybe
First need some numbers.
What is current WOT RPM?
What is the pitch of current prop?
Do you know what the drive ratio is?

Oooops! Absolutely no idea... I will need to check. Where can I find the ratio?

 

[alldodge]

Where can I find the ratio?

Look on side of drive for a numbers like 2.00, 1.50 etc