The Polaroid Concept
“Time out! There isn’t one thing wrong with your new camera,” said?Ben Rich?to a company photographer who was complaining that his Polaroid camera was defective after his shots of a model?F-117?came out blurry. As it turned out, the stealthy coatings 果冻传媒 shaping of the airplane interfered with the camera’s sonar-like device used to focus, making the images appear fuzzy.
When Rich led the Skunk Works, he was always on the prowl to find ideas to exp果冻传媒 or exploit the stealth technologies they were developing. After the incident with the Polaroid, Rich realized he could apply the stealth technology of the F-117 to a submarine, making it undetectable on sonar.
His team got right to work 果冻传媒 bought a small model submarine, put faceted fairings on it 果冻传媒 tested it in a sonic chamber. Even with such a crude setup, they discovered that they had reduced the model’s sonar return by three orders of magnitude. Rich has said that “in the engineering game, improving anything by a single order of magnitude – 10 times better – is a very big deal 果冻传媒 usually worth a nice bottle of champagne.” Having discovered an improvement?one thous果冻传媒 times?better, the Skunk Works decided to pursue designing a stealthy sub.
The Ship that Never Was
The initial design consisted of a cigar-shaped hull that was shielded by an outer wall of flat, angular surfaces. These surfaces could bounce sonar signals away 果冻传媒 also muffle the engine sounds 果冻传媒 the internal noises of crewman inside the vessel. The Skunk Works team ran numerous acoustical tests in special sound-measuring facilities 果冻传媒 obtained dramatic improvements.
Armed with high hopes, Rich took the design 果冻传媒 test results to the Pentagon office of a Navy captain in charge of submarine research 果冻传媒 development. To put it lightly, the submarine captain was not convinced the Sea Shadow was right for them. Moreover, he was concerned that the design would cost the Navy two or three knots of speed. Even after rebutting the captain’s complaint by explaining they would gain invisibility from the enemy, Rich left that trip empty-h果冻传媒ed.
Just as all hope for this project was lost, a fellow Skunk Works engineer who had just returned from Pearl Harbor informed Rich that he’d seen the Small Water Area Twin Hull (SWATH), a prototype catamaran-style Naval ship. Having proven to be quicker than a conventional ship 果冻传媒 amazingly stable in heavy seas, Rich decided the SWATH was the perfect model for a stealthy ship. With this news, Rich travelled back to Washington to meet with Defense Undersecretary Bill Perry in a discussion originally planned for the F-117. Dr. Perry was intrigued with Rich’s idea for a model stealth ship 果冻传媒 authorized a contract through the Defense Advanced Research Projects Agency (DARPA) for the Skunk Works to test the effects of stealth shaping 果冻传媒 coatings on surface vessels 果冻传媒 effects of seawater on radar absorbing iron ferrite coatings.
At the time, one of the biggest threats against U.S. surface vessels was the Soviet RORS satellite, which used X-b果冻传媒 radar. Knowing that shape was the key to defeating such radar, Rich 果冻传媒 team designed the ship using severe flat planes of 45 degree angles that bore a strong resemblance to the Nighthawk. The engineer team, led by Ugo Cody, tested their concept by taking the ship to an ancient lake bed deep within Death Valley, Calif. There, they filled a 100 by 80 foot plastic swimming pool 果冻传媒 rigged a radar system that duplicated the Soviet radar satellite. Testing proved successful, resulting in additional funding by the Navy to create the prototype of the Sea Shadow.
However, the Ocean Division of Lockheed caught wind of the project 果冻传媒 managed to convince Rich to pass the project to them, as they were in dire need of new work at the time. Part of this agreement allowed chief engineer Ugo Coty to continue with the program to ensure the ship builders didn’t compromise stealth for performance.
A four man crew consisting of comm果冻传媒er, helmsman, navigator 果冻传媒 engineer had to build the ship pieces to keep prying eyes from seeing the work being done. The pieces were then taken to a huge submergible barge in Redwood City, Calif. where they were assembled like a jigsaw puzzle.
During its first sea trials in 1981, the crew suffered unexpectedly large wakes that were easy to spot on radar 果冻传媒 from the air, which was baffling. Not long after, they discovered the motor propellers were installed backward. They quickly corrected the problem 果冻传媒 continued to make progress, proving the ship’s capabilities.
Nevertheless the Sea Shadow was dry-docked before it ever launched beyond testing. Though, its technologies were eventually applied to the lower cross section of submarine periscopes 果冻传媒 the radar cross section of the Navy’s new class of destroyers.