Hallberg-Rassy KEWA, Руководство пользователя

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KEWA Manual © Copyright 2016 Page: 45
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pressure is again pushing on the blade face and pulls the vessel in reverse. When under
sail in favorable conditions, the skipper can decide to motor sail using the back face of
the propeller blades, which have a steeper pitch than the front face of the blades. This is
accomplished by starting the engine and backing down to put the propeller in the correct
orientation. While putting the vessel in neutral, the current keeps the blades open. When
the transmission is put into forward, the propeller blades do not flip over, because the
positive pressure that develops when the prop starts to turn holds the blades in place. The
sails are raised and the vessel is now overdrive, achieving higher speeds for a given
RPM, or better fuel economy by running at reduced RPM's at a given speed.
The "overdrive" is used when motor sailing in fair weather or when using the engine
under sail. The "overdrive" gives the same speed at lower rpms. The result is less engine
noise, less vibration and better fuel economy.
When changing from "overdrive" to normal ahead, the shift and throttle control is set in
neutral, which allows the propeller to fold. Then the shift and throttle control is set to
forward again.
Sailing
To configure the prop for sailing in a mechanical transmission set up per the HR manual:
1. When sailing: Stop the engine. It doesn’t matter in what position the throttle lever
is.
2. When the engine is stopped, take the throttle to reverse position. Now the
propeller is in sailing position.
3. Take the throttle back to neutral, so that the engine can be started up quickly, in
case you should need to do so.
Gori Prop Service and Detailed Operating Instructions
Replacing the Aft Zinc
1. This should be done if more than 50% of the zinc has eroded away.
2. Undo the allen head bolt and remove the old zinc.
3. Clean the surface of the propeller hub to ensure a good clean contact between the
hub and the new zinc.
4. Replace the zinc with a new one. Index the fwd end of zinc with the end of the
hub.
5. Use the new allen head bolt supplied. Smear with Loctite before re-installing the
bolt. Check that the blades will swing freely from fwd through to reverse.
Replacing the Fwd Collar Zinc
1. First remove the 4 x allen-head bolts and remove what is left of the zinc.
2. Clean the surface of the propeller hub to ensure a good clean contact between the
hub and the new zinc.
3. Install the new zinc using the Loctite (supplied) on each of the 4 x allen-head
bolts.