The Jprop, unlike some other feathering propellers, comes completely assembled. Enabling the user with standard shaft dimensions to install the prop with no prior adjustments. Here are some of Jprop's design components in further detail:
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 |
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.
Jprop's 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.
The non-directional blade shape of Jprop not only reduces drag when feathered under sail. It also enables, when properly pitched:
|
A reverse thrust equal to forward thrust. |
|
Blade widths to be approximately 35% of the prop diameter (usually 25% on fixed sailor props). |
|
A
maximum thrust comparable to standard power-boat propellers of the
same dimensions (such as Federal's Pleasure Propellers). |
63mm hubs - up to 60 Hp
83mm hubs - 55 to 100 Hp
93mm hubs - 90 to 140 Hp
116mm hubs - 120 to 240 Hp
If you have any doubt as to your
application do not hesitate to consult your Jprop dealer or contact us direct at
bomon@odyssee.net or phone us -
1-800-300-3113 (US and Canada only) or 1-450-668 3111.
Here is a reference list of parts with diagrams of the Jprop's four hub diameters. Keeping in mind that the combination of horsepower, reduction ratio and shaft size is CRITICAL in determining the hub diameter of the propeller.
