General Electric H-Series
Introduction The '''General Electric H-Series''' is a family of turboprop aircraft engines produced by GE BGA Turboprops. The initial H80 is an updated derivative of the Walter M601, while the H75 and H85 are later derivatives.
Development The H80 is based on the Walter M601The H80 was launched in 2009 based on the M601.GE added a new compressor, blisks, blades and new stators to enhance power by 3% and boost efficiency by 10%.It reaches  (shaft horsepower) from the M601-F's , and improves hot and high performance.The H80 was certificated by EASA at 13 December 2011, followed by the FAA at 13 March 2012.Its Russian type certificate was received in October 2012, and the engine also approved by Brazilian Civil Aviation agency (ANAC) and the Argentine Administración Nacional de Aviación Civil.Its Electronic Engine and Propeller Control (EEPC) system received EASA type certification in late 2016.The Diamond Dart 550 military trainer is due to fly it in early 2018 and it will be certified on the Thrush 510G crop duster in this year.
Design The two-shaft, reverse flow design is derived from the Walter M601: its core features a two-stage axial and single-stage centrifugal compressor, an annular combustor and a single turbine stage, and its propulsion section is powered by a single-stage turbine driving a two-stage planetary gearbox.GE redesigned the compressor with 3D aero to improve its pressure ratio and upgraded the hot section and turbine stages with modern metal alloys for higher temperatures with the same durability.The H75-100 weighs  more than the equivalent PT6 but pioneers single lever electronic propeller and engine control in general aviation, for an initial TBO of 4,000 hr which could be increased with experience.It promises 10% better fuel burn, 10% longer overhaul and lower maintenance costs than the PT6A-135 for the Nextant G90XT.
Variants Thrush 510G;H80: formerly the M601H-80;H75: 750 shp or 550 shp derivatives;H75-A: 550 shp derivative with aerobatic modifications;H85: 850 shp derivative
Applications CAIGA Primus 150 H85 installation* CAIGA Primus 150 (H85)* Diamond Dart 550 (H75-100)* Dornier Do-28 G92 (H75-200)* Let L-410 Turbolet UVP-E20 (H80-200) and L-410NG (H85)* Nextant G90XT (H75-100)* Technoavia Rysachok (H80)* Thrush Model 510 (H80)
Specification (H80) + GE H Series Turboprop Engine Variant  H75  H80  H85 Dimensions (L×W×H)   basic dry   Compressor 2-stage axial + 1-stage centrifugal Combustor  Annular with fuel slinger turbine  1-stage axial gas.gen + 1-stage axial power  fuel type  Jet-A/A1 Shaft power       Eq. shaft power       Power-to-weight ratio       gas gen. RPM  35,524  35,854  36,183 Shaft RPM  2,080 airflow  /s     TBO  4,000 h Overall pressure ratio   6.7:1
See also
References
External links *  H-Series | GE Aviation*  EASA type certification data sheet *  GE Aviation Set to Begin Testing of its New H80 Turboprop Engine*  H80 on LeteckeMotory.cz (cs)