Performance Propellers

Catalina propellers

The Catalina and The PerfectPitch EXTENDO



Catalina boats have been in production for years. They were designed around the old reliable atomic four motor with clearance for a 12 or 13 inch propeller. When the modern engines were installed many of the boats were specified with 12 and 13 inch props simply because there was not space for a larger prop without redesign of the hull. This continues up to the present production.

Our Extendo propeller lets you install the larger propeller needed for the new diesel engines.


For Example our recommendations for the Catalina 30 are:



.................................original......performance



.................................catalina......propeller



Motor Mode.................2 blade.......2 blade



Universal M5411...........13X10.........13X10



Universal M-18............13X10.........13X10



Universal A-4...............12X7..........12X7



Universal M3-20...........13x8



UniversalM-25.............13X12..........E14X11



UniversalM-25XP.........13X12..........E15X11



Yanmar 2GM-20F.........13X10.........E15X11



Yanmar 3GM-30F ratio.2.36............E15x11



Yanmar 3GM-30F ratio 2.61............E15x12

propellers starting with E are extendo medels.

To props by boat page with other catalina sizes.

To size questionnaire

To props by motor and gear ratio.

If your prop is too small, no amount of experimenting with number of blades or pitch will give you quiet cruising in calm conditions, crisp maneuvering astern, low drag under sail and the ability to punch through a head sea. Only larger diameter props give you all these benefits.
The chart shows the typical propellers suggested for the Catalina 30 motor combinations, the normal 2 blade propellers suggested by catalina, and the performance Propeller recommendation. Note the size difference for the performance propellers recommendations for the geared diesel engines. The E preceding prop size designates an extendo propeller. That fits perfectly on the Catalina 30 and allows a larger propeller to be used.



Our Extendo props are a simple, easily installed way to replace undersized props. We designed a prop with an integral 6 inch long extension on the front. Because of the downward slope of the shaft and the upward slope of the hull, the 6 inch hub extension lets you swing a 2 to 3 inch larger prop.
The Extendo concept is particularly useful for vessels that have replaced Atomic 4 direct drive motors with modern diesels that have a gear reduction. Most boats that were designed for use with the Atomic 4 direct drive only have room for a 12-13 inch prop. Diesel replacements usually work better with 14, 15, or 16 inch props. The Extendo hub makes it possible to use a larger propeller with the new engine.

The EXTENDO
ext.jpg

More information about the EXTENDO propeller.


Performance Propellers


44 James Street                                     Phone 607-749-3165

Homer, NY 13077                             Fax 607-749-4604

Email performance.props@verizon.net