The futuristic SB1 Defiant military helicopter has hit the speed of 205 knots (235 mph) while cruising at low altitude in a stunning video.
Set to be a record-breaker, the “next generation” helicopter which is a joint project with Sikorsky and Boeing, has already surpassed the top speed of the legendary Black Hawk in the test on June 9.
Footage shows Sikorsky chief test pilot Bill Fell put the aircraft through its paces as he skims just above the tree-line.
The helicopter has coaxial contra-rotating rotors, which means parts of the mechanism rotate in opposite directions, and Mr Fell manoeuvres the helicopter at various angles to show off its dexterity and ability to turn tight angles.
He says: “That’s 200 knots true airspeed. Roger over 200. Just the beginning here.
“This thing’s got a lot more in it.”
Lockheed Martin hopes the SB1 Defiant will replace the Black Hawk which has been in service with the US Army since 1979.
The military technology giant bought Sikorsky, the manufacturer of Black Hawk, in 2015.
Black Hawk helicopters have a top speed of 192 knots (222mph).
Lockheed Martin recently appeared to simulate a US airstrike on Russian forces in promo footage of its future Skunk Works autonomous planes.
The clip shows motion graphics of a strike against a Russian S-400 missile defence system and Topol-M mobile intercontinental ballistic missile system, defence-blog.com reports.
It shows off various models of autonomous planes currently being designed at Lockheed Martin as well as its already active F-35 fighter jets.
F-35s were declared “ready for deployment” in the UK last year, with the RAF’s old Tornados retired after being in service since 1979.
Gavin Williamson, then Defence Secretary, said: “The incredible F-35 jets are ready for operations, a transformed Typhoon has the power to dominate the skies into the 2040s and we continue to look even further into an ambitious future.
“The RAF has long shown Britain at its great and global best, and today it lifts our nation to even greater heights.”