December 03, 2012
Credit: Credit: Northrop Grumman
The U.S. Navy’s unmanned combat air system demonstrator has taken two key steps toward demonstrating autonomous operation from an aircraft carrier at sea next summer.
On Nov. 29, the first Northrop Grumman X-47B air vehicle, AV-1, made its first catapult launch from a land-based test facility at NAS Patuxent River, Md. A second launch was planned for Nov. 30.
Earlier in the week, on Nov. 26, the second X-47B—AV-2—was hoisted aboard the aircraft carrier USS Truman at NAS Norfolk, Va., to begin a few weeks of deck-handling trials in port and at sea.
So far, AV-2 has completed engine runs, telemetry and communications checks, and been moved around the flight deck and hangar bay. Once the Truman is underway, the X-47B will be maneuvered through simulated carrier operations using a wireless hand controller.
Using the control display unit (CDU), the deck operator will maneuver the unmanned aircraft around the flight deck, in and out of the arrestor wires and catapult, and up and down the elevators, says Don Blottenberger, Navy deputy program manager.
Demonstrated in earlier ground taxi tests at Patuxent River, the CDU enables the operator to wirelessly control engine thrust, nose-wheel steering, main-wheel braking, flight-control sweeps and lowering and raising the tailhook.
Back at Pax River, the Navy will clear the limited catapult-launch envelope planned for the demonstration while it completes development of the software load required to begin shore-based arrested landings. These are expected to begin early in 2013, Blottenberger says.
A redesign of the tailhook point to ensure it catches the wire has been successful, says Capt. Jaime Engdahl, Navy program manager. The original design used an F-14 hook point, but did not reliably catch the wire in tests.
“We did a quick redesign, in 45 days, and have done three arrestment roll-ins, all successful,” he says. The problem is caused because the tailhook is closer to the main gear on the tailless X-47B and has less time to bounce back.