In September 1969, Sikorsky Aircraft made a decision almost unheard of in the defense industry: they would build a high-speed attack helicopter entirely with company funds, no Army contract, no government money. The prototype flew nine months later. It was called the S-67 Blackhawk (unrelated to the later UH-60), and it embarrassed almost everything else in the sky.

The specs were absurd for 1970. On December 14, 1970, test pilots Kurt Cannon and Byron Graham pushed the S-67 to 216.84 knots (249.5 mph) over a 3-kilometer course — a world helicopter speed record. Nine days later they set the 15-25 km record at 220.9 mph. The aircraft used a five-bladed articulated rotor, retractable landing gear, small stub wings that offloaded the rotor at high speed (adding lift and mounting hardpoints), and speedbrakes on the wing trailing edges that let it decelerate hard enough to perform loops and rolls — a helicopter doing aerobatics at the Farnborough Air Show in 1971.

It also carried a serious weapons load: a chin turret with a 30mm cannon or 7.62mm minigun, plus up to 16 TOW missiles or 2.75-inch rocket pods on the stub wings. The cockpit was tandem, armored, and had a low-profile silhouette from the front. Sikorsky pitched it as the answer to the Lockheed AH-56 Cheyenne, which was already hemorrhaging money and years behind schedule.

The Army evaluated the S-67 in 1972 against the Bell 309 KingCobra. Neither won. The Army had already decided to start the Advanced Attack Helicopter (AAH) program from scratch — which eventually produced the AH-64 Apache in 1975. Sikorsky's completed, flying, world-record aircraft was rejected in favor of a paper competition that would take five more years.

Sikorsky kept flying it as a demonstrator. On September 1, 1974, at the Farnborough Air Show, chief test pilot Kurt Cannon attempted a low-altitude loop, misjudged the recovery, and crashed. Both pilots were killed. The only prototype was destroyed. Sikorsky, having spent roughly $10 million of its own money with nothing to show, shelved the entire program.

Why it matters in 2026: The S-67's core insight — that a helicopter with retractable gear, offloading wings, and speedbrakes could push past 220 mph without needing exotic rotor systems — is exactly the design philosophy Sikorsky returned to 40 years later with the X2 and S-97 Raider (coaxial + pusher prop). But the S-67 achieved comparable speeds with conventional single-rotor technology. Modern composite blade materials, fly-by-wire control (which the S-67 lacked and desperately needed for its aerobatic envelope), and active vibration suppression would eliminate the exact failure modes that killed Cannon. The FARA (Future Attack Reconnaissance Aircraft) competition just got cancelled in February 2024, leaving the Army once again without a replacement for the OH-58 Kiowa it retired a decade ago. A modernized S-67 airframe — retractable gear, stub wings, speedbrakes, five-bladed rotor, all now understood problems — would cost a fraction of a coaxial pusher and hit the same speed envelope.

Sikorsky had the answer in a hangar in Stratford, Connecticut, in 1972. The Army wanted a different answer, then cancelled that too.