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RED A03 V-12 engine
Type Aircraft diesel engine
National origin Germany
Manufacturer RED Aircraft GmbH
First run 2009
RED A03 installed in a Yakovlev Yak-52

The RED A03 is a V12 four-stroke aircraft diesel engine designed and built by RED Aircraft GmbH of Adenau, Germany.[1]


In 2012, its unit cost was US$170,000.[2] The engine received type approval from the European Aviation Safety Agency in December 2014 for use in any CS-23 aircraft in both normal and utility categories.[1] It powered the Yakovlev Yak-152 trainer on its 29 September 2016 first flight.[3] The RED A03 is presented by the ILA Berlin Air Show as an application in the Aerobatic sector and for Defence and Security.[4]

The engine is proposed for the Hybrid Air Vehicles HAV 304/Airlander 10, a British hybrid airship design, powered by four engines and can be operated with two.[5] In November 2021, an Air Tractor AT-301 made a first flight retrofitted with a RED A03 engine.[6] The same month, a prototype Otto Celera 500L powered by a RED A03 engine was flown using Sustainable Aviation Fuel.[7] On 18 November 2022, Ampaire flew its Eco-Caravan maiden flight : the hybrid electric aircraft uses a RED A03 engine to reduce fuel consumption by 70% on shorter trips to 50% on longer ones, retaining the Grand Caravan payload capabilities with range improved to 1,100 nmi (2,000 km); supplemental type certificate (STC) is targeted for 2024.[8]

As of March 2023, there are reliable reports of flight testing on a DHC-2 Beaver.[9][better source needed]


It has twin double overhead camshafts. A marine version was planned for 522 kW/700 hp at 3,900 rpm.[10] The cylinder banks' angle is 80 degrees.[11] The RED A03-200 series is a derivative developed for very high-altitude operation up to 15 km (49,000 ft), with a maximum rating of 460 hp (340 kW) at FL250.[12]


Agricultural aircraft
Utility aircraft
Business aircraft
Trainer aircraft


Data from EASA Type-Certificate Data Sheet[1]

General characteristics

  • Type: 80° v-12 four-stroke compression-ignition piston engine
  • Bore: 86 mm (3.39 in)[17]
  • Stroke: 88 mm (3.46 in)[17]
  • Displacement: 374.3 cu in (6,134 cc)
  • Length: 1,100 mm (43 in)
  • Width: 850 mm (33 in)
  • Height: 750 mm (30 in)
  • Dry weight: 363 kg (800 lb) (RED A03-003/005), 357 kg (787 lb)(RED A03-102) dry



  • Power output: A03-003: 368kW (500 HP)Take-off at 2127 propeller rpm; 338kW (460 HP) maximum continuous at 1995 Propeller RPM, A03-005: 405 kW (550 hp)
  • Specific fuel consumption: 210 g/kWh (0.35 lb/(hp⋅h)) at 400 hp, 1862 prop. RPM, sea level[17]

RED A05 300hp V6[edit]

The RED A05 is a 2017 preliminary design of a V6 engine with 3,550 cc (217 cu in) displacement, outputting 300 hp (220 kW) at takeoff at 2127 propeller RPM and 280 hp (210 kW) continuously at 1995 propeller RPM, with a 210 g/kWh (0.35 lb/(hp⋅h)) best brake specific fuel consumption.[18]

See also[edit]


  1. ^ a b c "E.150 – Type-Certificate Data Sheet – RED A03 series engines". European Aviation Safety Agency. 30 June 2022.
  2. ^ Niles, Russ (July 29, 2012). "500 Horsepower V-12 Turbo Diesel Engine From Germany". AV web.
  3. ^ Perry, Dominic (5 Oct 2016). "First flight for Yak-152 trainer". Flight Global.
  4. ^ "RED Aircraft GMBH". ILA Berlin Air Show. Archived from the original on 2020-10-30. Retrieved 2020-10-27.
  5. ^ a b c d "Fleet of RED A03 powered aircraft". RED Aircraft.
  6. ^ "Maiden Flight of Retrofit Air Tractor 301 with RED A03 Piston Engine" (Press release). RED Aircraft GmbH. 23 November 2021.
  7. ^ "RED A03 Sustainable Aviation Fuel Tests For Celera 500L by Otto Aviation" (Press release). RED Aircraft GmbH. 16 December 2021.
  8. ^ a b "Ampaire had the maiden flight with the RED A03 powered ECO-Caravan" (Press release). RED Aircraft. Nov 18, 2022.
  9. ^ "Primeiro voo bem sucedido do DHC-2 Beaver com motor V12 diesel". (in Portuguese). 3 March 2023.
  10. ^ Henderson, Keith (March 31, 2011). "Lightweight 375 kW (500 hp) V12 Marine Diesel". Maritime propulsion. Maritime Activity Reports. Archived from the original on August 9, 2017. Retrieved August 9, 2017.
  11. ^ "The RED A03 Engine". RED Aircraft.
  12. ^ "A03-20x Series High Altitude". RED Aircraft.
  13. ^ "Airlander Hybrid Air Vehicles". RED Aircraft.
  14. ^ Kate Sarsfield (3 July 2020). "Pro-Avia selects Red A03 diesel engine to power in-development utility-twin". Flightglobal.
  15. ^ "Celera 500L Performance". Otto Aviation.
  16. ^ "yak 18". Flyer.
  17. ^ a b c "RED A03 - V12 - 6100cc / 374 cu in" (PDF). RED aircraft. Jul 2017. Archived from the original (PDF) on 2017-08-09. Retrieved 2017-08-09.
  18. ^ "RED A05 - V6 - 3550cc / 216 cu in" (PDF). RED aircraft. Jul 2017. Archived from the original (PDF) on 2017-08-09. Retrieved 2017-08-09.

External links[edit]