Max Prop
Automatic Feathering Propeller

Max-Prop compared to folding propellers and fixed blade propellers:

MAX-PROP
ADVANTAGE

UNDER SAIL...

IN FORWARD...

IN REVERSE...

A Max-Prop feathers to a low drag shape. Compared to a folding propeller, the extra wetted surface of the Max-Prop blades is offset by the reduction of projected area: A. Available in two & three blades. The torque of the prop shaft acting on the "differential" type design will open the blades in unison to the pre-seat pitch at any throttle setting. This will provide maximum efficiency (96% of same size fixed prop) plus eliminates the vibration problems of a folding prop. As in forward, the torque of the shaft will rotate the blades, 180 degrees in less than 3/4 of a shaft rotation, presenting the same leading edge and pitch in reverse. This provides better directional control and 80% greater power than a comparable fixed blade propeller.
FOLDING PROP
DISADVANTAGE

UNDER SAIL...

IN FORWARD...

IN REVERSE...

A folding propeller a low drag. The drag is directly proportional to the projected area: A.

Available in two blades.
The blades will "slam" open and, if not perfectly aligned or true to each other, will cause vibration.
In that the blades will not open to the maximum diameter (and occasionally not at all), the reverse power is very poor (much less than a fixed blade prop).
FIXED BLADE PROP
DISADVANTAGE

UNDER SAIL...

IN FORWARD...

IN REVERSE...

A fixed blade propeller includes a tremendous amount of drag, reducing the boats speed an average of 15%.
A fixed blade propeller provides maximum efficiency as long as the pitch is correct.
A fixed blade propeller works with the trailing edge as a leading edge, reducing its efficiency by 50%.

Features of Max-Prop

DRAG
One of the most important feature of the Max-Prop is that it feathers automatically with the forward momentum of the boat. Once feathered, it provides the least possible drag (similar to a folding prop) improving the vessel's sailing speed by an average of 15% above a conventional fixed blade propeller.

EFFICIENCY
In forward: the Max-Prop will offer 96% of the efficiency of a fixed blade propeller of the same diameter and pitch. The 4% loss in power can usually be eliminated by precisely matching the pitch of the Max-Prop to fit the boat engine combination.
In reverse: the Max-Prop provides 80% more power than a comparable fixed blade propeller. The Max-Prop utilizes the same leading edge in forward as it does in reverse giving the propeller the same thrust in both directions, whereas on a fixed blade propeller in reverse the trailing edge becomes the leading edge therefore reducing its efficiency by 50%
RELIABILITY
The Max-Prop uses a "differential" type design so that the blades cannot fail to open in forward or reverse. This positive system eliminates the problem associated with a folding propeller and its use of centrifugal force to open the blades. In a recent survey of Seven Sea Cruising Association readers the Max-Prop received a perfect rating on no failures ( one of only two products to receive such high praise). About 32,000 Max-Prop are in operation today!

VERSATILITY
The Max-Prop offers the possibility of pitch adjustment without external controls. Changing the pitch is very simple; it is done by changing the setting of the gear inside the propeller (usually upon a haul out). The ability to adjust the pitch will help achieve the maximum efficiency from the engine without having to purchase a new propeller. On the new V.P. model the pitch is adjustable externally.
INSTALLATION AND
MAINTENANCE
The Max-Prop will fit directly onto your existing shaft when the boat is hauled for installation. The Max-Prop will be matched to your specific shaft taper and can even be fitted on a Sail-Drive unit. The only required maintenance is to grease the propeller at least every other year (all the new Max-Prop are fitted with grease fittings).

RACING
Worldwide, many of the top racing boats have opted for the Max-Prop solution.

CRUISING
The two or the three blade Max-Prop is the propeller of choice for the cruising sailor. The combination of low drag, increased speed, outstanding backing power, safety and maneuvering, and fail safe design makes the Max-Prop the ideal cruising propeller.