USS Zumwalt, DDG-1000, complete 2nd US Navy acceptance Trials

There she is on her second (very successful) US Navy acceptance trials and will soon be turnd over to the US Navy soon.

They will put her through her paces for the next 18 or more months before commissioning in late 2017 or so. Beautiful and very powerful, modern vessel. The second will launch soon.

I admit to feeling much the same as you, but in reality, you would be quite astonished at just how small the radar signature is for a correctly designed vessel like that.

I read a book “Skunk Works” recently about the development of the F-117, and it was fascinating (recounted by Ben Rich, who ran the Skunk Works for a couple of decades)

in the book, he talked about how they calibrated the radars they were using in their stealth experiments, and he said (I know this sounds really hard to believe, but it is what he said in the book) that they had models to test the concept, and the could detect a metallic object the size of a BB (that is a BB gun BB, not a battleship BB!) five miles away!!!!!

In one high profile test, they had a bunch of bigwigs in, and to their disappointment, they were able to see the target model on their radar when they had believed they wouldn’t. It turned out a bird had landed on top of the model, and that was what they were picking up.

One of the surprising things was that early on, they found that the size of the object was not an issue, it was the shape. I don’t have the book at my disposal right now, but according to the math, and according to the data, the concepts that worked on an F-117 with the right shape worked exactly the same on a ship the size of a large naval vessel. Hard to believe, but that is what the testing showed.

The way Ben Rich described it, a standard frigate had the radar cross section of 50 barns, but their concept ship would have the cross section of a dinghy. (in his words)

In one experiment back in 1985, they had constructed a 500 ton stealth ship (I think they called it the Sea Shadow) that was about 70 feet wide, using these same concepts, and took it out on the ocean. They had P3 Orions using their radar they normally used to detect surface ships, and to be sure it was working correctly, had fake periscopes dropped in the water that the P3 could easily pick up.

On one night, they made 57 passes at the ship at night, and only saw it on their radar twice, both times when they were about a mile and a half away. They even provided the exact location of the vessel to the pilots, and they still couldn’t see it.

But as we know, the problem with stealth is that it has to match the background. If it is LESS visible than the background, it becomes visible as a “hole”. That was the problem they had with the Sea Shadow, was that the wake it made was more visible than the vessel itself.

And there are other ways, as we now know, that stealth can be defeated. But it is still an impressive feat. Ben Rich said Lockheed did a preliminary concept plan for an aircraft carrier that had the radar cross section of a life raft. I know it sounds insane, but that is what he said. It goes back to the concept that the size is not important, it is the shape.

Very interesting read.

Funny...for many years, I never knew that they did simply lower gun turrets into ships, and that it was often just gravity that kept them in place, even on battleships.

I had one of those weird "Huh...what the..." when I saw the images of the Bismarck sitting upright on the bottom of the Atlantic with those big gaping holes where her big gun turrets used to be!

Kind of like in "Ferris Bueller's Day Off" where he pretends to be the girl's father picking her up at school and lays a full lip lock on her, and the principal mutters "Huh...so THAT'S how it is in their family..."

As the destroyer is executing a turn to port, the bow is moving forward and laterally to the ship’s port or left side at the same time, causing water to stack against the side of the bow on the inside of the turn...

But you may be correct in misgivings regarding the design of the “tumblehome” bow...Lots of skeptics and some warnings from “old salts” and naval architects about problems at certain speeds in following seas...And small crew being inadequate for damage control if/when the ship is hit in combat...Also over reliance on unproven software...

Maybe the designers, engineers and brass who pushed this design should form a crew and take her into a Cat5 typhoon as proof of concept before any sailors’ lives are put at risk?

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