The aero engines that could propel Rolls-Royce's recovery

Rolls-Royce has a number of new engines in development which are already being snapped up by airlines.

After reporting its worst losses in its 111-year history Rolls-Royce will be looking to Derby to help it get out of the mire.

Three new engines, which have been designed and developed in Derby will be at the heart of the company's future success - the Trent 1000 TEN, the Trent XWB-97 and the Trent 7000.

All of these engines are at different stages of development. These are the new products that Rolls-Royce will be bringing to market over the next few years. But there is also a fourth engine - an engine that is already in service - that is important to the long-term future of Rolls-Royce's civil aerospace site in Derby - the Trent XWB.

Derby is the main production hub for the XWB. The firm has already ploughed tens of millions into the site to help it produce these engines. Now, production of the XWB is set to ramp up further - and the hope is that further investment could be forthcoming for Derby to help it meet demand.

Trent 1000 TEN

This engine is a more powerful version of the Trent 1000, which currently powers the Boeing 787 Dreamliner. The Trent 1000 TEN (which stands for Thrust, Efficient and New technology) draws on technology that has been developed for other Rolls-Royce engines, including the Trent XWB and the Advance, which is currently in development.

The engine had its first successful run on a Boeing 747 "flying test bed" aircraft in early 2016 - and in December it completed its first flight over the skies of Seattle, Washington.

The success of the Trent 1000 TEN is important to Rolls-Royce as it faces competition from rival General Electric to supply engines for the Boeing 787. It can produce 78,000lb of thrust compared to a standard Trent 1000 engine, which can generate 72,000lb. It is also lighter as some of its parts are made from carbon composite material, making it more fuel-efficient.

Trent XWB-97

The Trent XWB-97 is the latest version of the Rolls-Royce Trent XWB - and is the exclusive powerplant for the longer range Airbus A350-1000 aircraft. The Trent XWB-97's increased 97,000lb thrust is achieved through a combination of new high-temperature turbine technology, a larger engine core and advanced fan aerodynamics, allowing Airbus to increase the A350-1000 payload range and maximum take-off weight. Towards the end of last year, the first Airbus A350-1000, powered by two Trent XWB-97 engines, successfully completed its first test flight. The engine is due to enter service this year.

Trent 7000

The Trent 7000 is the seventh member of the Trent family of engines. It will exclusively power the Airbus A330neo aircraft. It brings together the best of the technology used in other engines that are being produced and developed by Rolls-Royce - including the Trent 1000-TEN and the Trent XWB. It succeeds one of Rolls-Royce's most successful engines ever - the Trent 700, which was first introduced in 1995. The new engine will offer improved fuel efficiency of 11%. The Trent 7000 ran for the first time on a test bed at the firm's civil aerospace division at Sinfin in November, 2015. It is due to enter service by the end of this year.