Sikorsky CH-53K "King Stallion" Ground Test Vehicle (GTV) at the company's Development Flight Center in West Palm Beach, Florida. The fully-instrumented Ground Test Vehicle "is also a fully-configured aircraft, less a few systems for affordability,” according to Sikorsky vice president Dr. Michael Torok. From its first bare-rotorhead engine light-off in January 2014 to late November 2015, the GTV had already run about 250 hours. From Vertiflite, January/February 2016.
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