Tug Commands PIDP to Jackknife

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11 жыл бұрын

This is a screen capture at Cal Maritime of a Transas simulation of a Damen 2411 Z-Drive tug escorting a tanker. The tug controls are in the lower right and the red oval indicates the towline force generated by the tug. Ship's speed is about 6 knots.
The pilot orders the tug to "Power Indirect My Port, Jacknife When Necessary" because he/she wants to assist the vessel in turning to starboard or the ship's rudder might have failed to port. Deck edge immersion is not recommended but may be acceptable in some emergency cases.
The red oval indicates the towline force, the green oval is the tugs speed and course over ground. "Power Indirect" indicates that the towline should be as close to 90 degrees as possible without damaging the tug, ship or line. During the jacknife maneuver the goal is to keep a strain on the line. This requires a fast winch to heave the line in as the tug turns.
The tug controls indicate direction and power order to the z-drive units.

Пікірлер: 15

@capnvicplate 8 жыл бұрын

Undead Grizzly: Thanks for you comments. Your points are well taken. The chock and bitt system is "rated" at 200 tons SWL.I have seen the line within inches of the house many times during this maneuver in the real world. Please describe how you would use the controls to jackknife for the benefit of all viewers. Thanks

@garysmith9961 6 жыл бұрын

I would put the tugs units into the walk position and use full power while the render system takes care of the line. Always trying to keep the bow of the tug moving away from the ship as best as possible. Once the tug gets around you engage the winch brake when the winch neutrals out. This ensures a smooth transition. If the tug isn't equipped with a render system you put the winch on haul in fast.

@capnvicplate 11 жыл бұрын

I happen to have high respect for Captain Greg Brooks. I don't think the manuever was done well but I'm not used to driving a tug with a mouse. I'm making the assumption that you know how to run a Z-Drive tug so I would appreciate constructive criticism so that others can learn from this animation and your talents. Thanks for your comment.

@oceanrunner2 11 жыл бұрын

better check with Greg Brooks on that jack knife maneuver - ATL

@barscanhicyorulmaz2281 9 жыл бұрын

what is the game name

@undead_grizzly1988 8 жыл бұрын

Too bad the chock was busted with that shockload on that line. I would never have tried a jackknife maneuver with the drive positions in that manner.

@undead_grizzly1988 8 жыл бұрын

Also, before the jackknife, the line came way too close to the tug. Probably would have caused damage in real life.

@daveh8114 12 күн бұрын

And jackknife means?

@capnvicplate 12 күн бұрын

Consider the tug as the knife and the towline as the blade. When you open the blade it becomes a “jackknife”.

@daveh8114 12 күн бұрын

@@capnvicplate not something in our lexicon…

@capnvicplate 12 күн бұрын

Daveh. Understand, one of my goals was and is to Standardize Tug Commands.

@daveh8114 11 күн бұрын

@@capnvicplate Would it not be simpler when a tug is in ‘indirect mode’ to say ‘ transition to direct pull’?

@capnvicplate 11 күн бұрын

@@daveh8114 I’ve been saying “Jackknife” since 1985, sometimes I will add: “jackknife when your ready” or “jackknife to 45 my port”. It’s hard to teach an old dog(me) new tricks.