RS.aero

What RS.aero does

RS.aero (ReinerStemme.aero GmbH) is a German aircraft designer and manufacturer developing modular aerial platforms with a focus on sustainable propulsion. Founded by Dr. Reiner Stemme and drawing on a programme heritage dating to the 1980s STEMME S10 glider, the 3-ton Q01 surveillance aircraft, and the Patroller UAV, the company's central programme is the 5,000 kg MTOM RS.500 platform, instantiated as three variants: the RS.500-S for remote sensing and ISR, the RS.500-T for express cargo, and the RS.500-VTV for up to nine-passenger commuter and utility operations. The platform combines a full-carbon PrePreg out-of-autoclave airframe, modular payload bay supporting up to 1,000 kg, an RPAS-capable flight control system enabling up to 25 hours of unmanned operation, twin internal-combustion engines offering 40–50% fuel burn reduction versus common turbines, and Sustainable Aviation Fuel compatibility, with a development pipeline extending into electric-hybrid, pure-electric, fuel cell, and Power-to-Liquid propulsion.

RS.aero is also an EASA Part 21 Approved Design Organisation, Production Organisation, and Combined Airworthiness Organisation, operating under CS 22 and CS 23 with EASA- and FAA-certified engines, allowing it to monetise certification know-how alongside airframe sales. Revenue is generated through one-time aircraft platform sales to government and commercial operators, technology licensing (notably the 2024 exclusive licence of the elfin electric motor glider to sister company elfin.aero GmbH), and aircraft certification services. The company is headquartered at Schoenhagen airfield (EDAZ) near Trebbin, Germany, with 11–50 employees, and supports development through a global engineering partner network and research collaborations including the ELAPSED project with Bundeswehr University of Munich on electric drive trains. Target customers are governmental defense and security agencies, environmental and climate monitoring operators, express medical and industrial cargo providers, and regional commuter air service companies across Europe and globally.

The company's go-to-market is enterprise-direct with no disclosed named customers, no published pricing, and no disclosed revenue, and the RS.500 platform remains in development rather than commercial delivery.

Name

RS.aero

Legal name

ReinerStemme.aero GmbH

Website

https://reinerstemme.aero

Company type

Private

Founded year

2020

Operating status

Operating

Headcount range

11–50 employees

Short description

RS.aero (ReinerStemme.aero GmbH) is a German EASA-certified aircraft designer developing the modular 5-ton RS.500 platform for government defense, environmental monitoring, express cargo, and regional commuter missions using sustainable propulsion and carbon-composite airframes.

Ownership category

akta.pro rank

Product category

Sustainable Aircraft Manufacturing

NAICS

Aircraft Manufacturing (336411), Aerospace Product and Parts Manufacturing (33641)

SIC

Aircraft (3721), Aircraft & Parts (3720)

akta.pro primary industry

Special-Mission Fixed-Wing Aircraft Manufacturing (ISR, AEW&C, Patrol) (IMABAAAH)

akta.pro secondary industry

Business & General Aviation Aircraft Manufacturing (IMABAAAC)

Keywords

• Sustainable aircraft manufacturing
• Modular aerial platforms
• Electric-hybrid propulsion
• Commuter utility aircraft
• Remote sensing aircraft

Headquarters

HQ city

Trebbin

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Technology or R&D, Supply Chain, Infrastructure, Operations, Marketing or Sales

Revenue model

1. Aircraft Platform Development and Sales: RS.aero develops and sells custom aircraft platforms including the RS.500 series. The company designs, engineers, and manufactures aircraft for various commercial and governmental applications including remote sensing, cargo transport, and commuter services. Revenue is generated through direct sales of aircraft platforms and potentially through licensing of developed technologies.
2. Technology Licensing: The company licenses out developed technologies such as the elfin aircraft to sister companies like elfin.aero GmbH based on exclusive licence agreements, generating licensing revenue.
3. Aircraft Certification Services: As an Approved Design Organisation, Production Organisation and Combined Airworthiness Organisation (CAO), RS.aero provides certification services for aircraft designs and components under EASA CS 22/CS 23 regulations.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

RS.aero designs, engineers, and manufactures modular aircraft platforms led by the 5-ton RS.500 series, with mission-specific variants for remote sensing/ISR (RS.500-S), cargo express transport (RS.500-T), and regional commuter/air service (RS.500-VTV). The aircraft feature full-carbon composite airframes and sustainable propulsion options (electric-hybrid, pure electric, hydrogen fuel cell, Power-to-Liquid), with up to 25 hours of unmanned operation. RS.aero also provides EASA CS 22/CS 23 aircraft certification and production services under Part 21 approvals.

Product overview

RS.aero is an innovative technology platform company specializing in aircraft development. The core product is the RS.500 aircraft platform (5-ton MTOM) with modular design supporting multiple variants: RS.500-S for remote sensing/ISR missions, RS.500-T for cargo express transport, and RS.500-VTV for commuter/air service operations. The company also has heritage products including the elfin electric motor glider (transferred to elfin.aero GmbH in 2024), Q01 3-ton surveillance aircraft, and Patroller drone. RS.aero focuses on sustainable aviation with expertise in composite materials, electric-hybrid propulsion systems, and advanced aircraft design under EASA CS 22/CS 23 certification standards.

Differentiator

Problem solved

Functional benefit

Brands

• elfin.aero: Sister company created in 2024 to handle development, production and marketing of elfin aircraft - a high performance self-launching glider and long-range recreational cruiser with panoramic side-by-side cockpit
• RS.500

Products and services

• RS.500 Aircraft Platform The RS.500 is a 5-ton MTOM modular aircraft platform with low-wing high-aspect-ratio and T-tail configuration, featuring a pressurized cabin and payload bay for use across remote sensing, cargo, and commuter missions. Sold to government agencies and commercial operators requiring flexible, sustainable aerial platforms.
• RS.500-S (Remote Sensing) RS.500-S is the remote sensing / ISR variant of the RS.500 platform, designed for airborne sensor applications in homeland, external and maritime security, disaster management, energy and infrastructure, climate, and environmental tasks. Achieves up to 250 KTAS cruising speed and offers up to 1,000 kg payload capacity.
• RS.500-T (Cargo) RS.500-T is the cargo variant of the RS.500 platform, designed for rapid express delivery of sensitive medical and industrial goods. Features 10 m³ cargo volume and efficient ICE engines compatible with JET-A1 and SAF fuels.
• RS.500-VTV (Commuter / Air Service) RS.500-VTV is the air service / commuter variant of the RS.500 platform, accommodating up to 9 passengers and a pilot. Features twin-engine capability, range up to 3,000 km, restroom, and operates on Jet-A1, Diesel, and SAF fuel options.
• Aircraft Certification Services Certification services for aircraft designs and components under EASA CS 22 / CS 23 regulations, performed under RS.aero's Approved Design Organisation, Production Organisation, and Combined Airworthiness Organisation (CAO) status. Provided to aircraft developers requiring regulatory compliance and certification support.

Quantifiable outcome

• 40-50% fuel reduction compared to common turbine engines when using new ICE engines with SAF
• +5 more outcomes

Segments5 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature8 records

Partnerships

Four partnerships are on record, tiered core and minor.

• elfin.aero GmbHcoreOEM/ Whitelabel/ Licensing Partner · 1 January 2024elfin.aero GmbH is a sister company that received exclusive licence for the final development, production and marketing of the elfin aircraft. The elfin is an innovative electric motor glider and high-performance self-launching glider with long-range recreational capabilities. This partnership allows RS.aero to focus on its core RS.500 platform development while elfin.aero handles the elfin product line.
• Bundeswehr University of MunichminorStrategic or Co-development PartnerCooperation agreement for the ELAPSED research project focused on development and evaluation of electric drive trains with emphasis on sustainable, efficient and safe operation. This partnership supports RS.aero's sustainable propulsion development objectives.
• Research Institutes (unspecified)minorStrategic or Co-development PartnerClose cooperation with research institutes enables incorporation of the latest technological findings into aircraft development. RS.aero is conducting various research programs aiming at finding the most suitable sustainable aviation propulsion systems of the future.
• Global Engineering Partner NetworkcoreStrategic or Co-development PartnerRS.aero relies on a highly skilled engineering network of long-time colleagues and partner companies. This global network enables methodical and cost-effective development of aircraft platforms through collaborative engineering resources.

Scale indicators7 records

Recent moves7 records

Expansion highlights6 records

Others

• ZeroAvia: UK/US hydrogen-electric propulsion developer targeting 9- to 20-seat regional aircraft retrofits and clean-sheet platforms. Comparable to RS.aero's fuel cell / PtL roadmap as a propulsion technology peer targeting the same sustainability-driven regional segment.

Direct peers

• Diamond Aircraft Industries: Austrian manufacturer of composite general aviation aircraft (DA40, DA42, DA62) and the eDA40 electric trainer. Comparable as an EASA-certified composite airframe OEM building versatile multi-mission piston/turboprop platforms.
• Pipistrel (Textron eAviation): Slovenian light aircraft OEM and pioneer of electric aviation (Velis Electro, Panthera hybrid). Comparable to RS.aero as a European EASA-certified general aviation manufacturer with a strong sustainable-propulsion roadmap.
• Tecnam (Costruzioni Aeronautiche TECNAM): Italian manufacturer of light general aviation and commuter aircraft, including the P2006T twin and the 11-seat P2012 Traveller used in regional/air service roles directly competing with the RS.500-VTV commuter variant.
• Stemme GmbH: German manufacturer of high-performance motor gliders founded by Reiner Stemme in the 1980s, including the STEMME S10 referenced in RS.aero's heritage. Directly comparable as a founder-linked light/specialized fixed-wing aircraft maker focused on unique technological features.

Emerging players

• Eviation Aircraft: Developer of the all-electric Alice commuter aircraft. Comparable as an emerging electric fixed-wing commuter OEM pursuing regional airline customers with sustainability-led value propositions.
• Heart Aerospace: Swedish developer of the ES-30 hybrid-electric 30-seat regional aircraft. Comparable as a European sustainable-aviation startup targeting the same commuter/regional segment as the RS.500-VTV, though at a larger passenger capacity.
• Aura Aero: French developer of the ERA hybrid-electric 19-seat regional aircraft and Integral family of training/utility aircraft. Comparable to RS.aero as a European startup pursuing hybrid-electric regional and utility platforms with EASA certification ambitions.

Broad incumbents

• Elbit Systems: Israeli defense electronics and UAV manufacturer producing the Hermes and Thor ISR UAS families. Comparable to RS.aero's RS.500-S ISR variant as a large, established special-mission UAV provider competing for the same government/defense ISR contracts.
• Textron Aviation: US-based general aviation manufacturer of Cessna and Beechcraft platforms, including the Cessna Grand Caravan EX used in cargo, commuter, and special-mission roles. Comparable as a broad incumbent with overlapping single-engine turboprop/commuter/special-mission product lines to the RS.500 family.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/reinerstemme-aero-gmbh

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about RS.aero