The Atomic 4 PerfectPitch Propeller
Added Power for your Universal Atomic 4 engine

Designed for your engine. 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.

Variable 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	Better	Same	Worse
in Forward?	90%	10%	0%
in Reverse?	96%	3%	1%

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.