– Jprop uses only helical (or continuously engaged) gears.
– Resulting in two distinct advantages:
– The blades of the propeller will have identical pitch at all times
– Helical gears have a large contact area producing more strength and less wear
Differentially Geared Pitch Adjustment
The pitch setting is determined by the amount of rotation the planetary gears are allowed by the internal stop in the adjustable tail-cone. As the shaft (C) and the drive gear (B) rotate clockwise, the planetary gears (G) rotate the blades (F). The pitch gear (E) rotates counter- clockwise in this differential system.
The housing remains stationary until the blades and pitch gear have rotated to the internal stop and therefore the pitch setting.
Jprops components are made from a variety of stainless steel and aluminum-bronze alloys. Each alloy is designed to suit the specific properties of the application. For instance, the pitch gear, blades, housing and tail-cone are all made from different alloys resulting in less wear between the parts. The combination of stainless steel and aluminum-bronze components also enhance lubrication and minimize corrosion.
In the feathered position, JProp reduces drag under sail. The blade design provides equal thrust in reverse and forward.
J prop Ratings
63mm hub – up to 60 HP
83mm hub – 55 to 100 HP
93mm hub – 90 to 140 HP
116mm hub – 120 to 240 HP
145mm hub – 145 to 400 HP