3 Blades to 4

• Sep 18, 2018

• #1

Express 390

Well-Known Member

Sep 14, 2018

661

South Shore of Long Island NY

Boat Info

1986 SeaRay 390 EC
1993 SeaRay 290 DA single 7.4 /Bravo 2
1992 SeaRay 230 DA 4.3LX Alfa drive

Engines

Twin 454 Crusaders inboards 4 blades

Hi New to the Forum, Well i recently went from three to four blades and found it to
be a positive improvement. She comes out of the hole and lays over a lot faster now. I also have a lot smoother ride, and while backing down to dock the response is great!

 

• Sep 18, 2018

• #2

Little Ducky

Well-Known Member

Jun 5, 2017

2,654

Dickson, TN / Chattanooga, TN

Boat Info

1998 290 Sundancer

Engines

Twin EFI 5.0L w/Alphas
Kohler 4kW

What spec was the original three blade..... vs the four blade you went to?

 

• Sep 18, 2018

• #3

Express 390

Well-Known Member

Sep 14, 2018

661

South Shore of Long Island NY

Boat Info

1986 SeaRay 390 EC
1993 SeaRay 290 DA single 7.4 /Bravo 2
1992 SeaRay 230 DA 4.3LX Alfa drive

Engines

Twin 454 Crusaders inboards 4 blades

Little Ducky said:

What spec was the original three blade..... vs the four blade you went to?

Click to expand...

the 3 blade was 19x18 had to drop the pitch 1 to 19x17

 

• Sep 18, 2018

• #4

NorCal Boater

Well-Known Member

SILVER Sponsor

Jan 24, 2008

3,451

Covington, LA

Boat Info

Boatless

Engines

No boat....no engines

What RPMs are you now getting at wide open throttle?

 

• Sep 19, 2018

• #5

Express 390

Well-Known Member

Sep 14, 2018

661

South Shore of Long Island NY

Boat Info

1986 SeaRay 390 EC
1993 SeaRay 290 DA single 7.4 /Bravo 2
1992 SeaRay 230 DA 4.3LX Alfa drive

Engines

Twin 454 Crusaders inboards 4 blades

NorCal Boater said:

What RPMs are you now getting at wide open throttle?

Click to expand...

i get 4300 RPM , I check once a season

 

• Sep 21, 2018

• #6

jonsm114

Active Member

Sep 4, 2015

250

Defiance, Mo

Boat Info

1996 400 Express Cruiser

Engines

7.4 MPI Mercruisers

Did that with my 400..went from a 21 to a 18 pitch.....great improvements. Still have RPMs, so I might pitch up an inch this winter. General propeller offered tuning as needed when I bought the props. VEEM machined bronze .