Juliet Marine’s “Ghost” Ship Emerges from Stealth Startup, Gears Up for War

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conference room when he heard the U.S.S. Cole had been attacked off the coast of Yemen by a small boat loaded with explosives. Seventeen U.S. sailors had been killed and many more wounded. He sat there in disbelief as he realized a billion-dollar warship had nearly been sunk by a couple of guys in a raft.

Juliet Marine would derive its name from a U.S. Navy “war games” exercise held in 2002. At $250 million, it was the most expensive exercise in Naval history. “Fleet Battle Experiment—Juliet” involved warships parked off the coast of California and a series of simulated small-boat attacks. The results of the simulation were grim: more than 20,000 deaths and massive losses to the fleet, in a Persian Gulf scenario. Yet, Sancoff says, the Navy hasn’t done anything in the past 10 years to guard against such attacks, other than work on targeted rocket systems.

“When you’re an entrepreneur, there has to be an overwhelming reason why you do it,” Sancoff says. “That was it for me.”

He saw a big opportunity—if only he could design a ship fast enough and maneuverable enough to intercept attackers before they could get close to big ships or shorelines. He had raced hydroplanes as a teenager—probably could bulls-eye womp rats, too (sorry, Star Wars joke)—so he had an intuitive feel for what it might take.

Which brings us to supercavitation. It’s an old idea. During the Cold War, the Russians developed a torpedo called the Shkval (“squall”) that could go more than 200 mph—five times as fast as a conventional torpedo—using a rocket engine and air ejected in front to produce a gaseous bubble completely enveloping the projectile. That reduces the friction between the hull and its surroundings by a factor of about 900, enabling superfast travel. Yet rocket-propelled torpedoes have downsides in performance and reliability; the sinking of the Russian submarine Kursk in 2000 is rumored to have been caused by a malfunctioning Shkval.

Meanwhile, the U.S. Navy and others reportedly have been working on a next-generation supercavitating torpedo since at least the 1990s. And in recent years, the Defense Advanced Research Projects Agency (DARPA) ran a program, called Underwater Express, to design a supercavitating submarine. There is also interest in using the concept to improve fuel efficiency for oil tankers, ferries, and other large ships, typically by creating air bubbles at the front of the hull. As of yet, however, nobody has publicly demonstrated a successful supercavitating craft.

To that end, after leaving Onux (which was bought by Bard in 2004), Sancoff spent several years doing research on his own and incorporated Juliet Marine in 2008. By June of last year, using $5 million of mostly his own money, his team had built a fully functioning prototype—Sancoff prefers the term “pre-production” vehicle. And earlier this year, he secured an additional $5 million from Avalon Ventures, the VC firm that invested in his last two companies.

At a Bay Area event in March, Kevin Kinsella, the Avalon partner on the deal, spoke glowingly of River Medical in particular. “We got 10x [return] in 18 months, and I only had to go to four meetings. An ROI of 2.5x per board meeting is fantastic,” he said. (Onux didn’t cash out quite as well, but it still worked out fine.)

After seeing firsthand what Juliet Marine built with $5 million, Kinsella said, “If you were taken around by a handler from Lockheed or Grumman or Northrop or any of them, and they told you, ‘We developed this on $150 million,’ you wouldn’t bat an eye.” He told the story of a meeting with Avalon and its fund investors. Someone asked Sancoff, “How did you get to be so capital efficient in your company?” Kinsella relays, “He leaned on the podium and said, ‘Because it was my money.’”

Not Your Grandfather’s Boat

OK, so here’s how it works, according to a patent filing (see diagram, below). The main compartment of the Ghost vessel, which houses the cockpit and controls, sits above the water in between two torpedo-shaped pontoons or “foils,” which are submerged and create all the buoyancy and propulsion for the craft. The angle of the struts that connect the foils to the command module is adjustable—so the craft can ride high in choppy seas and at high speeds (so waves don’t hit the middle part), and low in calm water and at lower speeds.

“We’re basically riding on two supercavitating torpedoes. And we’ve put a boat on top of it,” Sancoff says.

At the front of each foil is a special propeller system that pulls the craft forward. The propellers are powered by a modified gas turbine—a jet engine—housed in each foil; the air intake and exhaust ports for the engines are in the struts. As the ship moves through the water, the motion of the propellers creates a thin layer of bubbly water vapor that surrounds each foil from front to back, helped along by the presence of “air trap fins” that keep the vapor in contact with the hull (and keep liquid away from the hull). The vapor is what constitutes the supercavitation, so the foils can glide effortlessly through the bubbles.

“The key is the propulsion. You have to have a lot of power at the right location in this vessel,” Sancoff says. Exactly how this is done is … Next Page »

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25 responses to “Juliet Marine’s “Ghost” Ship Emerges from Stealth Startup, Gears Up for War”

  1. PJS says:

    video or GTFO

  2. Logos302 says:

    It’s the Defender from Decent :).

  3. Paul van Dinther says:

    Wow, a fleet of these vessels could finally clean up the waters around Solalia

  4. esorf says:

    The point of a patent is that in return for protection of your intellectual property, you have to share how it actually works.

  5. Geowash01 says:

    Two points:
    1- Outrun torpedoes? Until they come with supercavitation, too. (Besides tracking this thing will be easy, and it can’t out run a bomb.)
    2 – How will it see? Speed and boundary layer effects likely make all current acoustic sensors OBE.

    • atypicaloracle says:

      1. Supercav torpedoes already exist and have for well over a decade. They’re expensive, there aren’t many countries that developed them, and they can’t turn very well. Also, the part of the boat that is in the water (and thereby vulnerable) is stated to be relatively small – this would be like shooting a bullet with another bullet.

      The vehicle is designed for stealth, so tracking it with what? Aircraft? If the thing’s intended use is for naval interdiction against small craft attacks, then you are flying an observation aircraft near a naval group. That won’t end well for the “trackers.”

      I also have no idea what you mean by “it can’t outrun a bomb.” I’m not an air warfare expert, but I can only assume that hitting a 60′ long target going 80 miles per hour with any form of air-dropped ordinance is going to be insanely difficult.

      2. Well, aside from just looking out the windows… I don’t really know a great deal about how an object going 80-100 miles per hour generates enough of a boundary layer effect to blind its own radar, but apparently jet fighters going several multiples of the speed of sound manage it somehow. Technology is amazing.

  6. guest says:

    “Ghost cannot be hit by a torpedo. You would have to shoot it with a gun.”

    Unless you had supercav torpedos. :-)

    • Guest says:

      Unless as mentioned in the article the torpedos are not able to manoeuvre as well, a small, nimble and fast craft may be very difficult to hit.

  7. ddevine says:

     Hey guys I just invented a $5000 flying car with perfect handling. You should believe me because nobody lies on the internet.

  8. Johnbjormn says:

    The not hit by torpedoes has as much to do with extremely low radar profile as it does with speed — reread the article — or read other sites on this boat

  9. Z Bomb says:

    Supercav torpedos will be the next invention now that this is out there. Bullets were followed by bullet-proof vests. Rockets were followed by rocket-killing devices. Supercav boats will be followed by supercav torpedos. It’s inevitable.

  10. RandomDude says:

    As mentioned, they already have supercav torpedos,  That’s how the Kursk got sunk

  11.  Vapour/bubbleware ?…


  12. Valid says:

    If this ears Up for Warthen it should be destroyed or bombarded by NATO becase it is threat to to world.

  13. SoundBytes says:

    Ever hear of Ekronplan? Or a hydrofoil? This craft seems to be a hybrid of the two but, why?

  14. zensatori says:

      What  bout  objects  such as  deadhead tree trunks? Hyrafoils can  have a prob  with  those , hard  to spot  even on radar just the vertical trunk has a very small patch.

  15. jack says:

    ha, just what we need, billions more on military spending. good luck with that,
    let the h strait close for all we care.

    • mojo78 says:

      Yeah, because we all know the defense of a nation isn’t necessary, especially these days with all of the super nice people of the world.

  16. Kayefsee1 says:

    Here is the secret of the Ghost – the props had to be in the front cause if indeed the torpedos are at super cavitation stage (usually at about 60 knots) a rear driven prop would be caught up in the air cavity tail producing negative thrust.The props at front help keep induced bubbles injected directly behind prop in place even below 60 knots. but props are no good, i know i have a similar craft with superior drive with much less power oh and yeah its a super cavitation vessel and much more.

  17. blipfliptipper says:

    Imagine a fleet of these going up against the PLAN! A whole bunch of Chinese scrap metal sinking to the bottom of the ocean is what you’d get from that. Good stuff.