I guess you could say this ferry is the chinook of the maritime world.
- Posted using BlogPress from my iPhone
Thursday, February 18, 2010
An Engineer just can't resist
Following the stuck in traffic post a certain engineer of the maritime persuasion (who shall remain nameless to Dave him the shame) couldn't resist wanting to know more, specifically wanting to know about the twin propellers. Well here you go Mr Bailey:
I guess you could say this ferry is the chinook of the maritime world.
- Posted using BlogPress from my iPhone
I guess you could say this ferry is the chinook of the maritime world.
- Posted using BlogPress from my iPhone
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2 comments:
Thanks, ;-)
Okay, can see now, CPP (Controlable pitch).
When steaming the front prop goes to zero pitch, and shaft is braked to prevent any windmilling.
Also WWW QUOTE :
On departure from wharf.
1. Master "keys in" in Sailing mode for departure from the wharf.
2. Bow propeller goes into "feather". That is the blades turn 90 degrees so that they are orientated fore and aft.
3. Stern shaft brake dis-engages and stern shaft clutches in, if propeller is at zero pitch. If not prop returns to zero and then clutches in.
4. Lines are let go and master pushes control stick forward. RPM and pitch increase to move vessel.
On arrival at berth.
1. Master reduces throttle.
2. Master swithces control to maneuvering mode.
3. Engine RPM reduces to clutch in preset.
4. Bow propeller comes out of feather back to zero pitch.
5. Bow shaft brake releases and shaft clutches.
6. When making the wharf the stern propeller makes the "ahead" movements and the bow propeller makes the "Astern" movements.
7. Side ways thrusting is achieved by moving the joy stick side ways. When this happens both propellers go "ahead and both rudders turn in the oppsite direction to the required movement.
The above happens whether one or both engines are running. Either engine can be clutched into either shaft.
ENDQUOTE
Richard, I was following you right until the point you started Talking about controllable pitch then I lost interest and zoned out, sorry mate. You have too much spare time on your hands!!
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