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The Rolls-Royce Turbomeca RTM322 is a turboshaft engine currently produced by Safran Helicopter Engines. The RTM322 was originally conceived and manufactured by Rolls-Royce Turbomeca Limited, a joint venture between Rolls-Royce and Turbomeca, now Safran Helicopter Engines. The engine was designed to suit a wide range of military and commercial helicopter designs. The RTM322 can also be employed in maritime and industrial applications.

The Safran Aneto is a later development targeted for the super-medium and heavy helicopters, developed by Safran Helicopter Engines covering the range.<!--

The first order for the RTM322 was received in 1992 to power 44 Royal Navy AgustaWestland Merlin HM1s which subsequently entered service in 1998.

Over 1,100 engines are in service, having logged over one million flight hours, powering 60% of the Agusta-Westland AW101 fleet and 80% of in-service NH90s.

In 2013, Turbomeca, later part of the Safran Group, acquired the entire programme, becoming responsible for both production and product support. Safran Helicopter Engines has since developed a new engine derived from the RTM322, known as the Aneto.

Safran Aneto

thumb|Safran Aneto

The first 2,500 shp -1K was selected to power the Leonardo AW149 and Leonardo AW189K twin to extend their capabilities. The engine flew in March 2017 and was scheduled to be introduced in the fourth quarter of 2018.

The more powerful 3,000+ shp “Dash 3” should appear in the early 2020s and will feature a new compressor and hot section.

The required documentation was expected to be handed to the EASA in early 2019 for a second quarter certification.

By October 2018, the programme had accumulated 4,000 hours, including 105 hours of flight time. In 2018 Sikorsky was considering re-engining its CT7-powered S-92.

thumb|An Aneto-powered AW149.

The Aneto-1K was added on the RTM 322 type certificate on 12 December 2019.

Design

As an RTM322 variant, the Aneto is a two spool turboshaft with a three stage axial compressor and a single stage centrifugal compressor turning at 36,300rpm, a reverse flow annular combustor, a two stage gas generator axial turbine and a two stage axial power turbine with a forward transmission shaft turning at 21,000rpm.<!--ref name=TCDS/--> Fitted with an inlet particle separator, its accessory gearbox is driven by the gas generator and the engine is controlled by a FADEC.

Suited for 8–15 ton helicopters, it is developed from the RTM322: the -1K has a similar architecture but no common parts.<!--

Developed from a French Aviation Authority study, the Safran Power Pack Eco Mode on the Airbus Helicopters Racer allows it to put one of the two engines on standby during cruise flight, lowering fuel consumption by 15%, and quickly and automatically reactivate it with an electric starter to its maximum power for acceleration, landing or emergencies. The Aneto specific fuel consumption should be 10% better <!--original ref is "higher" but it must be a mistake as the younger RTM322 has a 255 g/kW/h SFC compared to the 263-283 g/kW/h older CT7--> than the competing CT7s. (suspended)

  • Airbus Helicopters Racer high-speed demonstrator: Aneto-1X, 2,500 shp.
  • Indian Multi Role Helicopter: Aneto-1H

Specifications

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See also

References

  • Rolls-Royce RTM322 page
  • Turbomeca RTM 322 page