The Atomic 4 PerfectPitch Propeller
Added Power for your Universal Atomic 4 engine
priced at $290
We started building props for the Atomic 4 in 1987. Our goal was to find a diameter and pitch combination which
would make the most of the engine's direct drive in forward and 1.3:1 gear reduction in reverse. We also wanted to keep the
prop's drag under sail at an acceptable level for cruising and casual racing sailors. Our Atomic 4 PerfectPitch Propeller
fits this bill. Its diameter is 12" with variable pitch: 6" for maximum speed, 7" for cruising, and 11" for reverse.
pitch vs. fixed pitch. We surveyed 96 sailors with Atomic 4's who replaced their bronze props with the Atomic 4 PerfectPitch
prop. Here are the results:
|How does the PerfectPitch compare with bronze
Easy to order. As long as your prop is in open water, and has no gear reduction
in forward (a few Atomic 4's do), ordering is easy. Simply tell us your shaft diameter: 3/4", 7/8" or 1" (the same diameter
as the zincs used on the shaft). We've taken care of the details, so you buy, haul and install just once.
To order call our propeller man at 607 749 3165.
Or email him at email@example.com
A word of caution. One propeller manufacturer claims
to have a special material that resists marine growth if the zincs are removed from the shaft. This may be true, but many
of the marine and corrosion experts that we have talked with are leery of removing the zincs from the propeller shaft because
something else will become the sacrificial anode in any galvanic reaction occurring along the propeller shaft. The question
is how much of which part will be sacrificed and how is the life of that part affected. Most would rather keep the zinc on
and know that the zinc will save all the remaining parts. The zinc is cheap, easy to replace and it will not fail catastrophically.
Extra caution and care for boats in slips may be required. There have been reports of accelerated galvanic corrosion caused
by stray currents from other boats and harbor wiring. While our props are inherently resistant to galvanic action we still
recommend zincs to control galvanic reactions in other parts.
For control of agressive marine growth we recommend maintaining
the prop much the same as you do the hull of the boat. Paint the prop at the same time as the bottom but use a non ablative
(hard coating) water based paint on the prop.