Otto Aviation Celera 500L

RED A03 Otto Celera 500L

The simple quote from the OTTO AVIATION Homepage:

We really appreciated the smooth and highly professional integration of our engine into this breathtaking new aircraft design. A good part of the SAF compliance and evaluation was done in this project.

CELERA 500L _2021 from Otto Aviation on Vimeo.



RED A03 Powered YAK-18T

Red aircraft GmbH has successfully fitted its revolutionary RED A03 engine to a YAK18T. By retrofitting a brand new engine to a pre-existing airframe, RED seeks to demonstrate the key benefits provided by the engine to other manufacturers and operators.

RED aircraft has successfully test flown a YAK-18T fitted with its highly efficient RED A03 engine. The flight represents a significant milestone for the company as it has exceeded expectations concerning performance and efficiency. In an unorthodox and proactive move, it was Raikhlin Aircraft Developments who initiated the conversion. In doing so, they have practically demonstrated several key benefits provided by the engine.

The Yak-18T was developed in the 1960s as a basic trainer, used to train Aeroflot pilots. It also saw sporadic use in the Soviet military as communication and reconnaissance aircraft. In more modern times, it was adopted as a reliable and affordable touring aircraft. With up to five seats, it provides plenty of room. The airframe is heavier than other aircraft of equal size, so it provided RED Aircraft with the ideal opportunity to demonstrate how effectively a high-powered engine can be utilized and retrofitted to something that would benefit most effectively.

RED was delighted with the performance of the engine. In a statement issued by the company, Jürgen Schwarz said:

”Compared to the traditional powerplant, the aircraft’s cruise speed increased significantly, while having more power reserves available. The aircraft is now equipped with modern instrumentation allowing for a precise control and monitoring of its engine systems. The YAK -18T- RED A03 is set for a brighter future with its powerful and more efficient power plant the RED A03” 

The benefits provided by the engine are numerous. The YAK-18T has always been a versatile aircraft. In particular, its ability to take off and land in very short distances makes it the ideal platform to test an engine that can provide 500HP at sea level. It is also capable of aerobatics. With Full Authority Digital Engine Control (FADEC), pilots can ensure accuracy and precision in the power they require during any manoeuvre while minimizing pilot workload.

The YAK-18T is a single-engine aircraft. Types such as these have a greater requirement for the utmost reliability. The RED A03 features two-cylinder bank redundancy, each of which is capable of independent operation. This significantly increases safety in the operation of the engine. The FADEC also stores and monitors engine data, allowing early identification of potential problems. This can also serve to reduce the potential downtime when maintenance is required.

By retrofitting the RED A03 engine, RED Aircraft has shown that solutions, such as theirs, are the future of aviation propulsion, both in new conceptual aeroplanes and existing types. By fitting the engine to existing airframes that traditionally used older and less efficient systems, the results spoke for themselves.

The RED A03 gave the YAK-18T exceptional climb performance. In fact, with the new engine onboard, the climb rate was doubled. Other key metrics were improved by similar margins. With the RED A03 fitted, the useful load of the YAK was increased by over 50%. The maximum speed was an area of particular interest. With the ‘old’ engine, the YAK could expect to reach a maximum speed of around 262 km/h. The RED A03 allows it to reach a maximum speed of around 400km/h.

The above is even more impressive when considering that the A03 was found to use 20-40% less fuel while achieving the above numbers. With longer missions, this represents a significant cost saving.

This project, voluntarily undertaken by RED Aircraft, demonstrated their confidence in the design and specification of the high-performance engine. By retroactively and successfully modifying an older aircraft with new technology, they have opened the door to a world of exciting possibilities. This is true for both newer concept aircraft like the Otto Celera and pre-existing airframes that could be ideally placed to take advantage of better efficiency and performance

The Aircraft is for sale. Demo flights and presales inspection are available at Termikas in Kaunas. Price talks may start at 480,000 Euros plus Tax if applicable.

 YAK – 18T
Engine M14PA03-00
Maximum Rangekm4001.134
General Performance  
Maximum speed TASkm/h262410
Fuel consumtion at 300 hpkg/h6648
Fuel consumtion at 460 hpkg/h 75
Rate of climbft/min9902100
Fuel Economy  
Fuel prices EUEur2,852,45
fuel cost per hourEUR250,80158,92
fuel cost per 100h operationEUR25.08015.892
average saveEUR -9.188
fuel cost per 1000h operationEUR250.800158.919
average saveEUR -91.881
fuel cost per 3000h operationEUR752.400476.757
average saveEUR/Gal -275.643

The key Arguments:

  • 20% to 40% lower fuel burn compared to turbine
  • Air induction (turbo charged).
  • Common Rail Direct Fuel Injection .
  • High-efficiency liquid-cooling circuit.
  • FADEC, single-lever powertrain control
  • Integrated dual-lane redundancy in FADEC.
  • Design Assurance Level: DAL B.
  • Self-carrying engine structure design
  • Enables use of 10 mounting points on the rear engine face for cantilever installation.
  • Integrated cowling-attachment points.
  • Dry-sump oil lubrication system with multiple scavenge pumps.
  • Engine and transmission oil reservoir integrated in gear box housing.
  • Engine and gearbox oil integrated heat exchanger, mounted on the engine block.
  • Self-adjusting hydraulic valve lifters.
  • Spur-gear driven camshaft and auxiliary pumps
  • Two optional alternators 28 V, up to 120 Amp.
  • Auxiliary flange AND 20010 for optional auxiliary drive (up to 6.5 KW).
  • Designed for manufacturability and ease of maintenance

Electric system changes

24V DC
Two main electrical  Busses – main bus 1 and 2.
2 Alternators / 2 Batteries
Essential Bus – fed from the two main busses
Single failure tolerant layout. A single fault will not result in Loss of Power

Fuel system

Kerosene fuel (TC-1, JET-A…)
Fuel capacity increased to 380 L
Redundant fuel supply, with 3 feed transfer pumps

Glass cockpit

10” – HDX1100 Screens, MFD and PFD
Dynon Skyview System
Standby Flight Instruments EFIS, COM
Radiopanel PS Engineering – PMA8000BT
Mode-S Transponder
Traffic Alarm (FLARM)
Engine Display –  MVP-50T
Optional capability for IFR and Autopilot

Engine Frame


MTV-9 or MTV-5 Propeller System

Pneumatic system change

Hydraulic retractable Gear
Hydraulic Flaps
No pneumatic component



Air Tractor AT-301

The AT-301 is widely used for agricultural work and was manufactured by Air Tractor in the US since 1976. The original engine was a P&W R-1340 designed in the 20th of the last century. Although the production numbers were rather high over the years, the fuel consumption and the spare part availability became a real obstacle as the aircraft earns money when in the air. With 100 LL prices in the area of 0.30 $/gal in the 70th, the engine did it’s job and everybody was happy.

Climate and fuel prices change, the job still is the same, costs and competition rise. It’s time to check where costs could be reduced. The RED A03 was the positive answer. A significant lower fuel consumption, Jet-A instead of AvGas, about the same power range – that looked like a real promising challenge.

It works.

A03 Engine Press Release

RED A03 achieved the TCDS extension for 550 hp

RED Aircraft A03 V12-cylinder compression ignition engine now available with 550 hp/405 kW.

RED Aircraft is a brand of Raikhlin Aircraft Engine Developments GmbH based in Adenau, Germany. RED Aircraft develops highly sophisticated and innovative engine solutions for motorsports and aviation. The award winning RED A03 series is a V12 compression-ignition engine, offering 500-550 hp/367-405 kW and is targetted to the GA, small commercial aircraft and UAV market intending to improve the eco balance in avoiding inefficient gas turbine designs.

The RED A03 engine holds the EASA TCDS E.150. We are very proud to annouce that our highly experienced engineering team was able to demonstrate the reliable engine operation with a FADEC version allowing 550 hp/405 kW. This allows higher power loads for the typical take-off and cruise performance. Our customers are now able to select the power version suitable for their target needs. Follow this link to the EASA TCDS. The EASA reference shall be updated within the next few days.

This is a result of a combined effort of software design in the FADEC as well as hardware reliablity proof on the mechanical side. Of course we are very proud that EASA was pleased with the results and amended the TCDS accordingly. The Canadian and US TCDS will be updated accordingly.

A03 Engine

RED A03 Mission profile

  • RED engines are qualified for all categories-classes-types of CS-23 and CS-27 aircraft including:
    • Utility
    • Commuter
    • Aerobatic
    • Agricultural Application
  • Innovation concepts from air taxis to electric helicopters
  • Aircraft for high altitude application.
  • UAV
  • LTA – Blimp – Airships
  • Groundeffect and Hovercraft
  • Maritime application
  • Generators and eHybrid solutions, land- air- or sea-based
  • Please contact us if you think about specific missions not listed here.
A03 Engine

RED A03 Key Design Features

► Operates with Jet-A fuels

► High safety level with independent circuits for each engine bank:

○ air induction system

○ fuel system

○ cooling system

► FADEC single lever engine control

► Turbocharged

► Self-carrying structure for cantilever installation

► Dry-sump oil system

► heat exchanger

► Designed for lean maintenance

500 hp A03-x03 series EASA TCDS E.150

550 hp A03-x05 series EASA TCDS E.150

► 600 hp A03-xxx series project state, non aviation use.


► Single or twin-stage turbocharge system for utility or high altitude application, A03-20x series.

► Utility gearbox for normal operation including oil reservoire. A03-10x series

► Aerobatic gearbox for inverted operation, external oil reservoire required

► Variable attachment frames for additional alternators and pumps.

► Firewall-forward kit development

► Cooling, Intercooler, thermal management design assistance.

A03 Engine A03 Technical Data

RED A03 Technical Data



No. Of cyl
and arrangement

V12 – 80°

Fuel type

Jet A1, kerosene type fuels acc. To
ASTM D1655, Def Stan 91-91 and GOST 10227 up to a maximum ignition delay time of 8.06 ms/minimum derived cetane number of 27.9 (determined according EN 15195/ASTM D6890)

Power A03-x03

500 hp – 378 kW/4,000 rpm

Power A03-x05

550 hp – 405 kW/4,000 rpm

Power A03-non aviation use (project

600 HP – 441 kW


372 CUI – 6.1 l

Bore & stroke

3.38″x3.46″ – 86×88 mm

Valves per cylinder


Camshaft system

gear driven dual overhead camshaft


Single or 2-stage system

Fuel system

Common rail high preasure system 1,600 bar – 23,206 psi

Electrical system

2x28V 3.5 kW alternator

Reduction gear


Dry mass w/o gearbox

290 kg – 640 lbs

Dry mass with normal/utility

363 kg – 800 lbs

Dry mass with aerobatic gearbox

357 kg – 787 lbs

Fuel Flow take-off power

85 KG/H – 187 lbs/h

Fuel Flow MCP

77 KG/H – 169 lbs/h

Fuel Flow 400 hp

65 KG/H – 143 lbs/h

Fuel Flow 300 hp

47 KG/H – 103 lbs/h

Engine control system

FADEC, EECU, EECS, sensors, Design Assurance Level B cert. ompliant RTCA DO-254,
DO-178B, DO-160G