A Revolutionary Helicopter for the U.S. Army

Future wars will not be fought like the wars of today.

DEFIANT X is an advanced utility helicopter and air assault weapon system that can fly low and fast, land quickly, deliver soldiers to the objective area (known as the “X”) and get out — all while evading the enemy in complex terrain.

It’s an agile, maneuverable aircraft that flies twice as far and twice as fast as the Black Hawk helicopter it will replace — and sits in the same operational footprint.

DEFIANT X builds on the handling qualities and transformational capabilities proven by SB>1 DEFIANT, a Sikorsky-Boeing technology demonstrator helping to inform the U.S. Army’s future vertical lift requirements. Combined with our team’s unsurpassed experience in mission systems, training and sustainment, DEFIANT X will significantly advance the Army’s air assault capability with limited changes in tactics, techniques, procedures, training and infrastructure.

DEFIANT X is purposefully designed for the U.S. Army’s Future Long Range Air Assault competition, a top modernization priority, and will revolutionize the way the Army meets threats in 2035 and beyond.

It will be the fastest, most maneuverable and most survivable military helicopter in history.

Survivability. Maneuverability. Sustainability. Versatility.

Total force protection starts with unmatched tactical maneuverability “at the X.”

With its rigid coaxial rotor system and pusher propeller, DEFIANT X incorporates proven Sikorsky X2 Technology™ to operate at high speeds while maintaining low-speed handling qualities.

This allows DEFIANT X to deliver speed where it matters – through tree lines, river beds, mountain ranges or contested urban environments – providing soldiers with unmatched maneuverability and survivability in high-threat air defense environments.

This critical capability allows crews to penetrate enemy defenses while reducing exposure to enemy fire, so they can quickly insert and extract soldiers with all their mission equipment in position – when seconds matter.

DEFIANT X is also optimized for:

  • Operational effectiveness in multi-domain operations (MDO) and Joint All-Domain Operations (JADO) environments, with the ability to connect all battlefield assets
  • Sustainment, including extended maintenance-free operating periods, ease of maintenance in austere environments, reduced forward logistics burdens and long-term affordability
  • Interoperability with current aircraft, techniques and infrastructure


Feature Stories

Computer rendering of the coaxial helicopter DEFIANT X in level flight.

Ready for today, modernizing for the future

October 11, 2022 in Defense

Boeing's innovative solutions help the U.S. maintain global dominance by deterring and defeating the threats of today — for the sake of tomorrow.

Learn More

DEFIANT Pilots Talk Future Long-Range Assault Aircraft

August 4, 2022 in Defense

Sikorsky pilot Bill Fell and Boeing pilot Ed Henderscheid have a combined 60-plus years of helicopter experience between them, and are part of the program to bring the Future Long-Range Assault Aircraft (FLRAA) to the United States Army. In this Q&A, they share what they love about the Lockheed Martin Sikorsky-Boeing SB>1 DEFIANT technology demonstrator and the DEFIANT X, which the companies are proposing for the FLRAA program.

Learn More

Six ways DEFIANT X supports the Army’s total mission

April 4, 2022 in Defense

DEFIANT X, an advanced air assault weapon system and utility helicopter, is the aircraft of the future. Flying low, traveling at high speeds, landing quickly and delivering soldiers to their destination—all while out-maneuvering the enemy—makes this aircraft critical across multiple domains.

Learn More

SB>1 DEFIANT Helicopter Completes Long-Endurance Flight to Nashville

March 31, 2022 in Defense

After three years of proving its transformational flight capabilities, the Lockheed Martin Sikorsky-Boeing SB>1 DEFIANT® helicopter arrived in Nashville this week to give U.S. Army Aviators a first-hand look at this impressive aircraft at the Army Aviation Association of America’s annual summit.

Learn More

Lockheed Martin Sikorsky-Boeing Adds to Team DEFIANT

March 31, 2022 in Defense

Sikorsky and Boeing have built 90 percent of the U.S. Army’s current military rotorcraft and represent the U.S. Army’s aviation industrial base

Learn More
Triple Threat: DEFIANT Helicopter Slaloms, Lifts External Loads and Demos Single-Engine Capability

Triple Threat: DEFIANT Helicopter Slaloms, Lifts External Loads and Demos Single-Engine Capability

February 17, 2022 in Defense

In three demonstrations during the same flight, the Lockheed Martin Sikorsky-Boeing SB>1 DEFIANT® helicopter demonstrated it is not only maneuverable, survivable and fast, but also provides the critical external lift capability of traditional rotorcraft.

Learn More

Lockheed Martin Sikorsky-Boeing Selects Honeywell Engine to Power DEFIANT X®

February 10, 2022 in Defense

Sikorsky, a Lockheed Martin Company (NYSE: LMT), and Boeing (NYSE: BA) today announced Honeywell (NYSE: HON) as the engine provider for DEFIANT X, the advanced helicopter for the U.S. Army’s Future Long-Range Assault Aircraft (FLRAA) competition.

Learn More

DEFIANT Executes FLRAA Mission Profile with Unsurpassed Speed, Maneuverability and Agility in High-Speed, Low-Level Operations and Confined Area Landings

January 18, 2022 in Defense

The Lockheed Martin Sikorsky-Boeing SB>1 DEFIANT® successfully completed FLRAA mission profile test flights, including confined area landings and low-level flight operations.

Learn More

Sikorsky-Boeing Team Reveals Advanced Assault Helicopter Designed to Revolutionize U.S. Army Capabilities

January 25, 2021 in Defense

DEFIANT X to compete for the Future Long Range Assault Aircraft contract, a top modernization priority for the Army

Learn More

Sikorsky-Boeing SB>1 DEFIANT™ Helicopter Achieves First Flight

March 21, 2019 in Defence

The Sikorsky-Boeing SB>1 DEFIANT™ helicopter achieved first flight today at Sikorsky’s West Palm Beach, Fla., site.

Learn More


Together, Sikorsky and Boeing have built 90 percent of the U.S. Army’s current military rotorcraft and have totaled more than 15 million flight hours. We’re the team that has brought forward iconic military rotorcraft including Black Hawk, Chinook and Apache.

Our team’s expertise in advanced manufacturing, testing and producing cutting-edge rotorcraft configurations has further advanced our understanding of the Army’s mission – enabling us to provide a flexible, agile, advanced solution with adaptable software and systems for future growth across multiple missions.

Follow Us

Follow us on Twitter at @BoeingDefense and use #DEFIANTX to join the conversation.