Ship Stability 101

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JK
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Ship Stability 101

Postby JK » Wed Jul 27, 2016 3:59 am

I know the ships are designed built for this, but I honestly wonder where the CG ends up on a load like this and what the GM is.
I imagine the ships must have some nice swooping rolls.


lo_07012016_0225.jpg


http://aerialmarine.com/v3/wp-content/uploads/2016/02/lo_07012016_0225.jpg

OHT Offshore Heavy Transport
Location: Malacca Straits

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Merlyn
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Re: Ship Stability 101

Postby Merlyn » Wed Jul 27, 2016 6:15 am

Flood up jobby and CG is virtually in the bilges I would think.
Stops the uprights painting the sky.
Bet they still wander though.
Wouldn't want to be changing a non working masthead lamp bulb in a rough sea.
Anchor light atop the masts.
Remembering The Good Old days, when Chiefs stood watches and all Torque settings were F.T.

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Big Pete
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Re: Ship Stability 101

Postby Big Pete » Wed Jul 27, 2016 8:05 am

I never understood why we are still using incandescent filament lamps for Navigation Lights.
Can't understand why we are not using LEDs or have the lamps on the bridge and a fibre optic cable up to the light fittings.
Changing lamps up mastheads is something that should be avoided especially at Sea, unless you have a death wish.

BP
It is always better to ask a stupid question than to do a stupid thing.

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D Winsor
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Re: Ship Stability 101

Postby D Winsor » Wed Jul 27, 2016 12:32 pm

I agree with the idea of replacing incandescent bulbs with LED's but there is a one advantage of having the incandescent lamps is that the heat from the bulb will melt any snow or ice that will collect on the lens in winter conditions. A lesson that some municipalities learned the hard way after switching traffic control street lamps to LED and then had to hire someone to clear snow from the lenses or put heaters in the lamps to melt the snow.
Troubleshooting 101 "Don't over think it - K.I.S.S. it"

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Merlyn
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Re: Ship Stability 101

Postby Merlyn » Wed Jul 27, 2016 11:36 pm

You should live over here, don't get that problem.
LED land here, everything,cars , trucks, every appliance etc is LED.
Runs cool,cheap to run,
Watches, tools, it's taken over.
Pennies to buy and just plug/ solder one in when one goes down.
I must say I would never have thought of that because they run so cool about your ice problem.
Something else learnt every day.
Remembering The Good Old days, when Chiefs stood watches and all Torque settings were F.T.

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JK
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Re: Ship Stability 101

Postby JK » Thu Jul 28, 2016 3:38 am

You fellows crack me up!
I posted this as a lead in to a discussion of stability on ships and the topic went swooping off on a totally unexpected direction-LED lighting.


How about changing the forward mast searchlight on a ore carrier in the Arctic in -30?

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Merlyn
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Re: Ship Stability 101

Postby Merlyn » Thu Jul 28, 2016 7:13 am

In calm weather run up a spare feed into another holder, ( Y piece ) insulated earth return and in the sanctuary of the wheelhouse flick the two way switch.
Let there be light.
Preventative maintainance.
Over here our direction change is known as diversification.
Remembering The Good Old days, when Chiefs stood watches and all Torque settings were F.T.


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