Before returning to bends around points on other rivers, I want to share some photos I took yesterday, first in a while at Bergen Point. Here’s the set-up out of Newark Bay.
I’d love to know the tension of the line up from Marjorie.
Ellen pushes on the port stern quarter, and
Robert counters on the opposite bow.
It’s gusty.
But someone calling the shots up there knows how
to rotate
just right. A year from now, it’s possible there will be gaps in that lower roadbed, if any of it left at all.
I’ve no idea what the clearance was yesterday, and I’m eager for that walkway to be re-opened.
Another job is almost complete here as of late morning Friday, but the work never ceases, as traffic into the port can be said to
be ever lining up. There are 30 (I believe) of these Ever L ships, liberal, lasting, lovely, loading, lifting, lucid, laden, lucky, loyal, linking, and more.
Lambent left Shanghai in early November and will be back in Panama Asia-bound late next week.
All photos here by Will Van Dorp.
tugster: a waterblog 
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December 11, 2016 at 6:32 pm
Les Sonnenmark
MARJORIE’s line tension depends on her thrust at the moment, as well as the thrust of EVER LAMBERT if she’s propelling ahead. From the photo it’s not apparent what either vessel is doing, so let’s assume that EVER LAMBERT is minimally thrusting ahead (or at least has some residual way on) and MARJORIE is pulling astern at some level to control the ship. Let’s do a ballpark calculation to estimate the maximum tension due to MARJORIE’s thrust alone. MARJORIE is a 4000 hp twin-screw tug with Kort nozzles. She’s certainly making little speed, so let’s assume she’s in bollard pull condition. A good rule of thumb is about 25 lb bollard pull per horsepower for a Kort-nozzled prop, so that gives us a maximum of about 100,000 lb horizontal pull. But the line is at about a 25 degree angle (measuring from the photo), so the tension in it is higher. Divide the bollard pull by the cosine of 25 degrees and you get about 110,000 lb tension in the line at maximum tug thrust. If she’s pulling on a typical 8 inch (circumference) line, that line in good condition should be able to take about 600,000 lb tension. So there’s a good factor of safety, especially in calm water.
December 11, 2016 at 7:27 pm
tugster
Les– Thx much. I appreciate the walk-through of yr calculations. I haven’t used cosine since high school.