The Model 250 has been continuously enhanced, and today the only engine part common with the original design is the data plate. The latest Series IV engines, rated from 650 to 715 shp, feature state-of-the-art, single-stage, centrifugal compressors and full authority digital engine control (FADEC). The world's leading light helicopters – including the Bell 407 and 430, Enstrom 480, MD Helicopters MD500/600 series and Schweizer 333 – rely on the Model 250, as do an ever-increasing range of turboprop aircraft and UAVs, notably the Northrop Grumman MQ-8B Fire Scout VTUAV.

Rolls-Royce has repeatedly demonstrated the power of partnerships, and has teamed to develop the most modern range of turboshafts. The MTR390, developed in collaboration with Turbomeca and MTU, is now in production as the powerplant for the Eurocopter Tiger attack helicopters of Australia, France, Germany and Spain. The first Tiger customer delivery took place in December 2004, and development of the multi-role Tiger HAD - to be powered by the 14 percent growth MTR390-E developed through a partnership between MTR GmbH and ITP - is now underway. The 1,285 shp MTR390 has also been demonstrated in the Eurocopter Panther, and is well positioned to meet future civil market requirements for the next generation of intermediate twins.

The Light Helicopter Turbine Engine Company (LHTEC) T800, developed in partnership with Honeywell, is the world's most advanced 1,200 to 1,700 shp turboshaft engine. Originally developed to power the U.S. Army's RAH-66 Comanche stealth helicopter, the T800 is now in production as the commercially-certified CTS800-4N for the next-generation AgustaWestland Super Lynx 300 multi-role platform, already in service with three operators. The CTS800-4K variant is now also in flight test on the ShinMaywa US-2 amphibian, and another version of the engine family, the T800-LHT-801, has been selected to power the prototype of the Sikorsky X2 Technology high-speed rotorcraft. The T800 family has also been test-flown on a range of additional applications, and is currently being offered for a range of civil and military rotorcraft.

The RTM322, developed in partnership with Turbomeca, is the customers choice for new-generation medium helicopter engines. With current models rated between 2,100 and 2,600 shp, the RTM322 has been designed for growth to over 3,000 shp. The RTM322 has been selected by three of the four NHI NH90 home nations, and has now also been selected to power the NH90 fleets of Australia, Finland, Greece, Norway, Oman, Portugal and Sweden, securing a 90 percent market share for this application. Initial NH90 deliveries are scheduled to take place in 2005. The RTM322 is also the lead engine on the AgustaWestland EH101, already in service with the UK Royal Navy and Royal Air Force, and now selected by Denmark, Japan and Portugal, securing a greater than 60 percent market share. Now in service with the UK Army's Apache AH Mk.1, the RTM322 is being now being offered for additional applications such as the Sikorsky H-60 Black Hawk family, and represents today's solution to tomorrow’s power needs.

The AE 1107-Liberty turboshaft offers unrivaled capabilities in the 6,100 shp power range, and meets the needs of future heavylift rotorcraft. A member of the Rolls-Royce common core family, which also includes the AE 3007 turbofan and AE 2100 turboprop, the AE 1107 has already demonstrated its performance and reliability as the powerplant for the Bell-Boeing V-22 Osprey tiltrotor aircraft. This powerful, advanced and versatile engine is easily retrofitable to today's heavylift helicopters, including the Sikorsky CH-53 Sea Stallion and Boeing CH-47 Chinook.