Sikorsky-Boeing helicopter gets 42% more powerful engine than T55


WASHINGTON – Defiant X – one of the helicopters involved in the future long-range assault aircraft [FLRAA] program and co-developed by Sikorski [Lockheed Martin’s company] and Boeing has chosen the engine that will power the helicopter, Honeywell’s HTS7500. Honeywell also produces the current T55 engine for America’s flagship UH-60 Black Hawks attack helicopters.

Photo credit: Wikipedia

Honeywell claims the HTS7500 offers 42% more power than the T55. The HTS7500 is an advanced turbocharged engine and is the latest engine in the company’s product portfolio. The new Defiant X engine will provide much better performance – the helicopter will fly faster over long distances. The HTS7500 offers a high power-to-weight ratio of any comparable motor, Honeywell said.

The HTS7500 will reduce fuel consumption by 18% and increase the helicopter’s efficiency when operating in areas with a high concentration of sand, such as deserts, because it has a very good tolerance for sand absorption. Its maintenance costs over the life of the engine are low compared to the T55. The HTS7500 is 51.2 inches long, 32.2 inches high and the output shaft speed [RPM] is 15,000 rpm.

Sikorsky-Boeing helicopter gets HTS7500 - 42% more powerful engine than T55
Photo credit: Honeywell recalls that in mid-January 2022, the Defiant X successfully completed tests to determine and confirm airworthiness, developing a speed of 236 knots, and then immediately went into vertical landing in an area of very limited landing.

“Defiant X is a transformational aircraft, and Honeywell is giving us a transformational engine to power it,” said Paul Lemmo, president of Sikorsky. “Defiant X is optimized for operational efficiency, sustainment and interoperability with the enduring fleet, and will transform the military.”

Defiant is a joint development between Sikorski [Lockheed Martin’s company] and Boeing as part of the future long-range assault aircraft [FLRAA] program. The FLRAA is to offer next-generation helicopters from the US Air Force and US Navy. According to the Pentagon’s preliminary plans under this program, five different aircraft should be developed to be integrated and share the same sensors, avionics, engine and countermeasures.

Defiant X was officially unveiled to the US military in 2021 by Sikorski [Lockheed Martin’s company] and Boeing. The new combat helicopter will replace the UH-60 Black Hawks. The other participant in the race is the Bell V-280 Valor. Which of the two will be the new US Army combat attack helicopter will be known this year.


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