West Palm Beach, Florida – Sikorsky Aircraft Corp.
, a subsidiary of United Technologies Corp.
, has officially unveiled the CH-53K heavy lift helicopter, the next generation in the CH-53 type series that the U.S. Marine Corps expects to begin operational service in 2019. During the rollout ceremony, attended by members of Congress, the Department of Defense, major suppliers to the program, international guests, and company employees, the Commandant of the Marine Corps General James F. Amos introduced the name for the new aircraft: the “King Stallion.”
“The rollout of the CH-53K helicopter introduces a new era in Marine Corps aviation and is an exciting milestone in our company’s 91 year history,” said Sikorsky President Mick Maurer. “The CH-53K aircraft will effectively triple the external load carrying capacity of the CH-53E aircraft – to more than 27,000 lb over a mission radius of 110nm. With its 88,000-lb maximum gross weight, powerful new engines, lightweight composite structure, new rotor blades, and fly-by-wire flight controls, the CH-53K will have the means to move troops and equipment from ship to shore, and to higher altitude terrain, more quickly and effectively than ever before.”
GE Aviation’s all-new T408 engine plays a key role in the increased capability of the CH-53K helicopter. Compared to the CH-53E aircraft’s T64 turboshaft powerplant, the three new engines provide 57% more power for approximately 20% lower specific fuel consumption. To convert the extra engine power into torque and shaft horsepower within a similarly-sized main gearbox, Sikorsky developed a new transmission that efficiently transfers the engine power to the CH-53K helicopter’s main rotors.
For increased lift, Sikorsky developed the largest and most technologically advanced main rotor blade the company has ever produced. At 35ft span length, and almost 3ft chord width, the all-composite blade has 12% more surface area than the CH-53E blade.
The new aircraft’s major airframe sections were built from strong, lightweight advanced composite materials by Aurora Flight Sciences, Exelis, GKN Aerospace and Spirit Aerosystems.
And to ensure exceptional flight handling qualities and low pilot workload, a Rockwell Collins digital glass cockpit governs a fly-by-wire flight control system developed by Sikorsky, UTC Aerospace Systems, Eaton, and BAE.
The CH-53K is one of the first all-digitally designed helicopters. This approach enabled Sikorsky to assemble the aircraft inside a 3D virtual reality lab at its Stratford, Conn., headquarters before prototype production began.
“Our ‘build before you build’ approach allowed our engineers to work ‘inside’ the helicopter,” said Maurer, “to verify assembly designs and correct issues long before discovery and expensive rework on the assembly line.”
To ensure smart, affordable logistics support during the life of the aircraft, Sikorsky and the government are applying methodology that will enable the Marine Corps to analyze flight, maintenance, and performance data from every aircraft. By identifying trends across the fleet, the Marines are expected to realize significant improvements in aircraft readiness and reduced operational costs compared to the CH-53E fleet.
In April, Sikorsky began powered ground tests of the CH-53K aircraft systems, such as rotors, drive, electrical, hydraulic, avionics, and flight controls. Hundreds of hours of powered ground tests will prepare the CH-53K team for first flight at the end of 2014, and the start of a three-year flight test program.
Per the current program of record, the Marine Corps intends to order 200 CH-53K production aircraft and stand up eight operational squadrons and one training squadron to support the Marine Corps’ operational requirements. Eventual production quantities would be determined year-by-year over the life of the program based on funding allocations set by Congress and the U.S. Department of Defense acquisition priorities.
Rotor blades tested
Sikorsky Aircraft already has begun full system testing of the CH-53K heavy lift helicopter’s seven main rotor blades and four tail rotor blades on a non-flying prototype called the Ground Test Vehicle (GTV). This begins a rigorous two-year test program of the rotor blades, transmission, engines, and all subsystems while the GTV is anchored to the ground.
“This is another key milestone in our building block approach to maturing the aircraft system,” said Mike Torok, Sikorsky’s CH-53K Program vice president, of the event. “The aircraft is now fully configured to proceed to the next series of system integration tests that will further validate the aircraft systems, such as rotors, drive, electrical, hydraulic, avionics and flight controls – all leading to operational acceptance testing that will clear the flight aircraft for flight operations. The preliminary results maintain our confidence in meeting first flight of the initial flight test helicopter in late 2014.”
During the next 250 hours of operation, the GTV will continue to assess the helicopter’s subsystems and the structural integrity and whirl characteristics of the rotors, blades and drive train.
The first of the four flight test helicopters – known as Engineering Development Models – is scheduled to take to the skies in late 2014. During the three-year flight test program, each flight test aircraft is expected to accumulate approximately 500 flight test hours. To ensure safety of flight, the GTV will continue to accumulate hundreds of operational endurance hours ahead of the flight aircraft.
Source: Sikorsky Aircraft Corp.