KEWA Manual © Copyright 2016
Page: 46
46
Replacing Flexible Stops
1.
These can be replaced
without removing
the blades.
2.
Using a flat screw driver. Pry out the old or worn Flexi-stops.
3.
Push the new flexi-stops in place. It may be necessary to swivel the blades open
and closed to obtain the best angle for re-installing the new ones. Remember they
are flexible.
Operating Instructions
The Gori 3-blade propeller has two distinct pitch settings in the forward direction –
standard and overdrive or, as the Hallberg-Rassy manual refers to them, first gear (high
revolution) and second gear (low revolution). Although standard forward is the pitch
setting that Gori views as the “normal” setting, Hallberg-Rassy recommends second gear
as the normal gear, and my experience has been that overdrive works great under most
conditions.
In overdrive, the pitch setting in forward is increased, thus decreasing the engine RPM
between 300 to 600 RPM. The boat will attain the same boat speed at lower RPM in the
overdrive position as it is a pitch increase.
Ahead
The propeller will operate in the standard fwd setting when the blades open due to the
centrifugal force of the shaft when in gear. Should you have backed out of your slip and
then engaged fwd while the boat was in fact still moving aft you may well be in
“overdrive” without knowing it. To go back to standard fwd, gear simply move the shift
lever into neutral for several seconds … (allowing the blades time to fold together), and
then go back into fwd. You will soon learn the difference between standard and
“overdrive” by checking boat speed and engine RPM/sounds. When maneuvering around
the marina you may well remain in “overdrive”. Therefore when leaving the marina and
beginning your trip always check that you are in the drive position you want be it
standard or “overdrive”.
Astern
In the reverse position the blades swivel 180˚ opposite the forward position which
ensures the same blade shape and leading edge to the water … resulting in higher
efficiency. This will also greatly reduce or even eliminate prop-walk when maneuvering
in reverse in the marina. If the boat has not been used for some time, it is wise to shift
cautiously between fwd and reverse a few times before going out sailing in order to clean
the teeth of the blades and the gears from further fouling. In the reverse position the pitch
on the blades is at a greater angle/pitch then when in standard fwd. This is done
purposely as many transmissions have higher ratios in reverse then fwd and so require a
greater pitch to take into account the slower shaft rpm when in reverse.
Overdrive
As mentioned above this position is obtained when the blades are set in the reverse
position, but the blades and shaft are rotating fwd. In this situation you will have a
