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THE
EXTENDO
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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. Our Extendo props
are a simple, bolt on way to get rid of 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 on boats with fin keel/skeg rudders.
For boats with propellers in tight apertures, the Extendo hub is not an option
so you would
have to settle for just the gains of better aerofoil shape and
flex pitch.
The Extendo concept is particularly useful for vessels replacing 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 15-16 inch props. The Extendo hub makes it possible to use a larger propeller with the new engine.
 The Extendo |