Athena A. Key features: Applications: TECHNICAL SPECIFICATIONS DATA SHEET APRIL 2017

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1 Athena A ELECTR IC VTOL TURB O-FAN Athena-A-V1.x-2ET (2 stages counter-rotating) TURB IN E EL ECTR IQ UE D E POU SSÉE ST AT IQU E ELEKTR O-TU RBO FAN TECHNICAL SPECIFICATIONS DATA SHEET APRIL 2017 The Neva Aerospace Athena Series are Electric Turbofans (ETFs) engineered for efficient Vertical Take-Off and Landing (VTOL). These devices are known by various names worldwide: Standschub optimimerter elektroimpeller or Elektro-turbofan in Germany, Turbine électrique de poussée statique in France and Electric VTOL Turbo- Fan (ETF) or static thrust Electric Ducted Fan (EDF) in the UK and USA. Neva Athena Series turbines are the result of several years of R&D and provide high performance and remarkable efficiency. In particular they are designed for static thrust and are optimised for VTOL and STOL operations. Key features: Key Safety is intrinsic in the design of all Neva ETFs, and there are no un-caged propellers: Internal redundancy with 2 separate stages, 2 motors, and 2 ESCs (2ETversion) Reduced size High thrust density Greater efficiency (high power loading as measured in kg/kw) Athena A (autonomous) is offered in several variants: 1ET: 1 stage clockwise (CW) or counter-clockwise (CCW) 2ET: 2 stages counter-rotating Athena Series turbines are delivered fully assembled with Electronic Speed Controllers (ESC), motors and propellers. Applications: Typical usage for manned or unmanned aircraft: Bespoke applications for medium sized UAS/UAV Bespoke heavy-payload, high-safety UAV/UAA Extreme sports (paraglider, base-jump, Turbo-Ski, etc ) Security and defence applications Electric aviation: high -efficiency VTOL and slow speed linear flight Airships: high efficiency thrust for VTOL & slow speed linear flight

2 Made in Europe Doc. Rev. 5.6 ATHENA-A-2ET-V1.52 (2 stages contra-rotating)* ATHENA-A-st-2ET-V1.60 (2 stages Contra-rotating)**-SHORT Max Diameter of Turbine at Inlet 250 mm Max Diameter of Turbine at Inlet 250 mm Rotor Assembly Diameter 195 mm Rotor Assembly Diameter 195 mm Length of Turbine 200 mm Length of Turbine 170 mm Weight of Turbine kg Weight of Turbine kg Max Thrust 2.5 kgf Max Thrust 2.4 kgf Electrical Power at Max Thrust 0.69 kw Electrical Power at Max Thrust 0.51 kw Normal Operating Thrust 1.5 kgf Normal Operating Thrust 1.5 kgf Power at Normal Operating Thrust 0.31 kw Power at Normal Operating Thrust 0.26 kw Supply Voltage 14.8 V (4S) Supply Voltage 14.8 V (4S) Max Current 48 A Max Current 48 A 6.1 gf/we 6.5 gf/we 5.8 gf/we Efficiency (Gross Power Loading) 5.6 gf/we Efficiency (Gross Power Loading) 5.3 gf/we at various Thrust settings 4.7 gf/we at various Thrust settings 4.8 gf/we 3.9 gf/we 4.3 gf/we 4.2 gf/we 4 gf/we 3.6 gf/we Material Composite Material Composites Noise Level (@3m ) 92dB at full power 84dB half power Noise Level (@3m ) 92dB at full power 84dB half power *Measurements on Athena-A-2ET-V1.52 Apr ** Measurements on Athena-A-st-2ET-V1.60 Feb Notes: 1.5x and 1.6x are in different composite materials and so have different density and weight ratio. 1.5x shroud: carbon composite, and other components: plastic composite. 1.6x all parts are plastic composite. V1.5x integrates the ESC weight (ESC integrate within the turbine) V1.6x does not integrate the ESC weight (ESC are oustide the turbine) Neva-Athena_A_1ET-2ET-Public_Spec_rev5.6_ docx 2/6

3 Made in Europe Doc. Rev. 5.6.ATHENA-A-1ET-V2.0 (1 stage Clockwise or Counter-Clockwise)*** Max Diameter of Turbine at Inlet Rotor Diameter Length Weight Max Thrust Electrical Power at Max Thrust Normal Operating Thrust Power at Normal Operating Thrust Supply Voltage Max Current Efficiency (Gross Power Loading) at various Thrust settings Material 250 mm 195 mm 200 mm 0.6 kg 2.0 kgf 0.47 kw 1.3kgf 0.26 kw 11.1 V (3S) 42 A 5.25gf/We 5.22gf/We 5.05gf/We 5gf/We 4.85gf/We 4.6gf/We 4.4gf/We Composite *** Expected specifications for a Release during Q pre-order from July Neva-Athena_A_1ET-2ET-Public_Spec_rev5.6_ docx 3/6

4 ATHENA-A ELECTRIC VTOL TURBO-FAN Made in Europe Notes on Technical Specifications: International System of Units (SI Metric): kg= kilogram, g=gram, kgf=kilogram force means thrust measured in kilograms; g/we (or gf/w) means efficiency in gram-force-thrust per Watt electric consumed. Weight & Control Systems: ESC means Electronic Speed Controller The weight of our turbofans includes shroud, motors, propellers, and motor holder(s) but not the ESCs. ESCs are delivered by Neva Aerospace together with the turbofans. Motors: Depending on your applications we mount 2 types of electric motor with different power, please contact us for motor specifications. Accuracies: All figures are given with a +/- 5% accuracy. All thrusts in gf or in kgf and efficiencies (power loadings) in gf/we or kgf/we represent gross values and are given with reference to the International Standard Atmosphere for dry air (ICAO 1964) and as such pertain to measurements at 15 degrees Celcius at hPa and zero humidity. Updates: Specifications are subject to be updated without notice. Please contact us to obtain the latest specifications. Warranty Warning: Any modification made to the ESC, motor, propellers, fan or shroud geometry, or over-clocking will void the warranty. Icing condition: De-icing may not be fitted and our turbofans are currently not acceptable for icing conditions. Flight Level: Not allowed to fly above 2000ft (Feet) / 600M (Meter) Restrictions: Civilian applications are authorised up to 25kg MTOW aircraft (LT25). About Certifications & Flight Rules: We make no warranties on the acceptability by the local regulator nor certification under local UAV/UAS regulation or Manned aircraft regulations. It is the full responsibility of the integrator, aircraft manufacturer, to liaise with its certification body. Unmanned: Our turbofans may be used for VLOS & RLOS up to 25Kg MTOW depending on your region and local laws; and may not be suitable for BLOS according to your local rules. Applications with a MTOW higher than 25kg and/or above 2000ft require a special authorisation from Neva Aerospace Ltd Manned: Our turbofans have to be certified within your aircraft under ULM or Prototype certification rules with your aircraft and may be suitable for VFR certification. All information in this specification sheet is proprietary. All images are non contractual. Patents (EU, USA, and INTL) granted and/or pending: DM/089417, Neva-Athena_A_1ET-2ET-Public_Spec_rev5.6_ docx 4/6

5 External Dimensions: Athena -A-2ET-V1.5 (contact us for the dimension of Athena-A-st-2ET-V1.6)

6 Neva Aerospace Ltd Sussex Innovation Centre Science Park Square Brighton BN1 9SB United Kingdom 6/6 Neva-Athena_A_1ET-2ET-Public_Spec_rev5.6_ docx