Stemme
Stemme GmbH is a German EASA-certified manufacturer of self-launching high-performance motor gliders (S12 family), selling composite aircraft and aftermarket services globally to private pilots, research institutions, and aviation education organizations through a regional partner network.
- Company typePrivate
- Founded1984
- HeadquartersStrausberg, Germany
- Headcount101–250
- GTM typeB2B and B2C
- OfferingHardware or Manufacturing
What Stemme does
Stemme GmbH is a privately held German aircraft manufacturer founded in 1984 by Dr. Reiner Stemme in Berlin and now headquartered at the EDAY airfield in Strausberg near Berlin. The company is a certified EASA Design, Manufacturing, and Maintenance Organisation that specializes in high-performance, self-launching motor gliders — aircraft that combine the aerodynamic efficiency of a sailplane with an integrated propulsion system for independent take-off. Its signature engineering feature is a proprietary retractable folding propeller connected via drive shaft to a center-of-gravity-mounted engine, enabling a 5-second transition between powered and silent gliding flight; this design is described as unique in the aviation industry since 1984.
The current product lineup centers on the S12 family — the Twin Voyager S12 (flagship, 25 m wingspan, 1:53 glide ratio, range up to 1,759 km), the Sky Cruiser S12-SW (compact 21.7 m wingspan), and the Grand Tourer S12-G (premium variant with Garmin G3X glass cockpit) — together with the REMOS GX single-engine aircraft and the ECARYS ES15 utility aircraft. Composite airframe construction, foldable wings, solar panels with dual electrical systems, and integrated avionics (Garmin, LX Navigation, FLARM, Becker) form the technical platform. The company has delivered more than 330 aircraft worldwide.
Revenue is generated primarily through one-time aircraft sales (S12-G listed at €639,735 ex-VAT), supplemented by recurring maintenance services, spare parts, professional maintenance training, pre-owned aircraft brokerage, and paid owner experiences (Stemme Days packages €425–€995/day). Stemme markets globally through its Strausberg headquarters, a wholly-owned US subsidiary (Stemme USA Inc., West Columbia, SC), and a network of regional sales and authorized service partners covering Germany, the US, the UK, Scandinavia, Poland/Baltics, Austria, Australia, and Mexico. Customer segments span wealthy private pilots (primary), research institutions such as ONERA, and aviation education organizations such as the Soar Hawaii Foundation.
Stemme firmographics
Firmographics- Name
- Stemme
- Legal name
- STEMME GmbH
- Website
- https://stemme.com
- Company type
- Private
- Founded year
- 1984
- Operating status
- Operating
- Headcount range
- 101–250 employees
- Short description
- Stemme GmbH is a German EASA-certified manufacturer of self-launching high-performance motor gliders (S12 family), selling composite aircraft and aftermarket services globally to private pilots, research institutions, and aviation education organizations through a regional partner network.
- Ownership category
- akta.pro rank
Stemme industry classification
Industry- Product category
- Motor Glider Aircraft Manufacturing
- NAICS
- Aircraft Manufacturing (336411), Aerospace Product and Parts Manufacturing (33641), Other Aircraft Parts and Auxiliary Equipment Manufacturing (336413)
- SIC
- Aircraft (3721), Aircraft & Parts (3720), Aircraft Parts & Auxiliary Equipment, Nec (3728)
- akta.pro primary industry
- Business & General Aviation Aircraft Manufacturing (IMABAAAC)
- akta.pro secondary industry
- Glider & Sailplane Manufacturing (IMABAAAG)
Keywords
Where Stemme is headquartered
LocationHeadquarters
- HQ city
- Strausberg
- HQ country
- Germany
- HQ region
- Europe
Offices9 records
Markets served
Stemme business model
Business model- GTM type
- B2B and B2C
- Offering type
- Hardware or Manufacturing
- Cost components
- Personnel, Supply Chain, Technology or R&D, Operations, Marketing or Sales, Infrastructure
Revenue model
- Aircraft Sales: Primary revenue from selling new high-performance motor gliders including S12, S12-SW, and S12-G models. More than 330 aircraft have been sold worldwide.
- Pre-owned Aircraft Sales: Sale of pre-owned and certified pre-owned Stemme aircraft through the company.
- Maintenance and Spare Parts: Professional maintenance services, spare parts supply, and training courses for Stemme aircraft owners worldwide.
- Training Courses: Professional maintenance training for Stemme aircraft covering aircraft systems and maintenance processes.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| One time/ perpetual license | Multi-year contract | S12-G Grand Tourer - Brand New |
| Unit Pricing | Pay-as-you-go | Stemme Days Package A - Full Experience |
| Unit Pricing | Pay-as-you-go | Stemme Days Package B - Discovery Flight |
| Unit Pricing | Pay-as-you-go | Stemme Days Package C - Self-Fly |
Go-to-market motion2 records
Distribution channels5 records
Marketing channels6 records
Stemme product offering
Product offeringCore offering
Stemme GmbH designs, manufactures, and sells high-performance self-launching motor gliders, anchored by the S12 product family (Twin Voyager S12, Sky Cruiser S12-SW, and Grand Tourer S12-G), as well as the Remos GX light aircraft and Ecarys ES15 utility aircraft. The company complements aircraft sales with pre-owned aircraft brokerage, professional maintenance, spare parts supply, and pilot/maintenance training courses. Revenue is primarily driven by one-time new aircraft sales, supported by recurring service revenue.
Product overview
Stemme GmbH is a certified German aircraft manufacturer specializing in high-performance motor gliders with composite structure. The company produces the S12 product family, which includes three variants: the S12 Twin Voyager (25m wingspan, flagship model), the S12-SW Sky Cruiser (compact 21.7m wingspan), and the S12-G Grand Tourer (premium variant with Garmin G3X glass cockpit). All S12 variants are self-launching motor gliders featuring a unique foldable variable-pitch propeller, retractable undercarriage, and side-by-side cockpit configuration. The company also manufactures the REMOS GX for private customers and the ECARYS ES15 utility aircraft for professional operators. With over 330 aircraft sold worldwide, Stemme markets through a global distributor network.
Differentiator
Problem solved
Functional benefit
Brands
- Twin Voyager S12: The ultimate high-performance aircraft with 25m wingspan, 1:53 glide ratio, and turbo-charged ROTAX engine.
- Sky Cruiser S12-SW
- Grand Tourer S12-G
Products and services
- Stemme S12 Twin Voyager Flagship high-performance self-launching motor glider with 25m wingspan, foldable variable-pitch propeller, retractable undercarriage, and side-by-side cockpit. Offers 1:53 glide ratio, cruise speed up to 259 km/h, and range up to 1,759 km (950 nm). Built for private pilots seeking the ultimate touring and adventure flying aircraft.
- Stemme S12-SW Sky Cruiser Compact version of the S12 with a reduced 21.7m wingspan for improved handling and maneuverability while maintaining 1:50 glide ratio and the same cruise speed and range capabilities as the Twin Voyager. Features state-of-the-art winglets and optimized aerodynamics.
- Stemme S12-G Grand Tourer Premium S12 variant featuring dual 7-inch Garmin G3X Touch glass cockpit displays, integrated digital autopilot, digital engine monitoring, 25m long-wing configuration, LX Navigation suite, and luxury interior appointments. Listed at €639,735 excluding 19% EU VAT.
- REMOS GX Single-engine, fixed-gear aircraft manufactured by Stemme for private customers, complementing the S12 motor glider product line within the company's broader aircraft portfolio.
- ECARYS ES15 Utility aircraft developed for professional customers, part of Stemme's diversified aircraft portfolio targeting commercial and professional use cases.
- Pre-owned Stemme Aircraft Sales Sale of pre-owned and certified pre-owned Stemme aircraft (including S12 family variants) directly through the company, providing a secondary-market channel for new buyers.
- Aircraft Maintenance and Spare Parts Professional maintenance services and spare parts supply for Stemme aircraft owners worldwide, delivered through Stemme's in-house EASA-certified Maintenance Organisation and FAA Part 145 certified US operation (supporting over forty US-based aircraft).
- Maintenance Training Courses Professional maintenance training courses for technicians covering Stemme aircraft systems and maintenance processes, delivered through the company's Authorized Service Partner network.
Quantifiable outcome
- Over 330 aircraft delivered worldwide since founding
- +5 more outcomes
Companies that use Stemme
Customer profileNamed customers7 records
Segments3 records
Ideal customer profiles3 records
Stemme technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration8 records
Feature6 records
Stemme partnerships and signals
Strategic signalScale indicators8 records
Recent moves9 records
Expansion highlights6 records
Stemme competitors and assessment
Company assessmentMarket position
Strengths4 records
Competitive moat4 records
Key risks5 records
Key highlights6 records
Customer concentration
Stemme social profiles
Digital presenceStemme compliance and trust
Trust signalCompliance4 records
Stemme financial estimates
Financial estimateRevenue estimate
Valuation estimate
Stemme leadership team
Management profileNumber of profiles
Profiles4 records
Stemme subsidiaries and ownership
Company hierarchySubsidiaries1 record
Stemme funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Stemme M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Stemme
What does Stemme do?
Stemme GmbH designs, manufactures, and sells high-performance self-launching motor gliders, anchored by the S12 product family (Twin Voyager S12, Sky Cruiser S12-SW, and Grand Tourer S12-G), as well as the Remos GX light aircraft and Ecarys ES15 utility aircraft. The company complements aircraft sales with pre-owned aircraft brokerage, professional maintenance, spare parts supply, and pilot/maintenance training courses. Revenue is primarily driven by one-time new aircraft sales, supported by recurring service revenue.
Is Stemme a public or private company?
Stemme is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Stemme founded?
Stemme was founded in 1984. It employs 101 to 250 people.
Where is Stemme based?
Stemme is headquartered in Strausberg, Germany, in the Europe region.
How does Stemme make money?
Four revenue lines are on record. Aircraft Sales are the primary driver. The others are pre-owned Aircraft Sales, maintenance and Spare Parts and training Courses.
Does Stemme have an API?
No public API is recorded for Stemme.
What industry is Stemme in?
Stemme's product category is Motor Glider Aircraft Manufacturing. Its primary akta.pro industry code is IMABAAAC, Business & General Aviation Aircraft Manufacturing, with a secondary code of IMABAAAG, Glider & Sailplane Manufacturing. Its NAICS code is 336411 and its SIC code is 3721.