Akaflieg Karlsruhe
| Company type | Student organization |
|---|---|
| Industry | Aviation, Aircraft design, Glider manufacturing |
| Predecessor | Glider Club Karlsruhe |
| Founded | 1928 |
| Defunct | 1933 (first disbandment) |
| Fate | Reestablished 1951 |
| Headquarters | Karlsruhe , Germany |
Area served | Germany, worldwide (academic and gliding community) |
Key people | Karl Töpfer (founder) |
| Products | Gliders, sailplanes, flight computers, winches |
| Owner | Karlsruhe Institute of Technology (student collective) |
Number of employees | Students (number varies) |
| Parent | Karlsruhe Institute of Technology |
| Website | www |
Akaflieg Karlsruhe represents one of the ten academic flying organizations (Akaflieg) affiliated with German universities. The term Akaflieg stands for Akademische Fliegergruppe, denoting a student collective linked to a German university. The Akademische Fliegergruppe Karlsruhe e.V. (Akaflieg Karlsruhe) consists of students from the Karlsruhe Institute of Technology who engage in glider design, development, and aerodynamic research.
Akaflieg Karlsruhe between 1928 and 1933
During the winter term of 1927/28, Karl Töpfer, an assistant responsible for aircraft technology at the motor vehicle department, established a glider group. This organization was officially registered as the Academic Flying Club Karlsruhe in 1928. The group inherited a hang-glider called „Brigant“/„Bandit“, a large wing with a passenger harness, from the recently disbanded Glider Club Karlsruhe. Between 1928 and 1933, three gliders were constructed: "Zögling"/"Pupil", "Hol’s der Teufel"/"Let the devil get it", and "Karlsruhe". On May 13, 1933, Akaflieg Karlsruhe was disbanded, and all equipment was transferred to the Karlsruhe branch of the German Aviation Federation.
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Reestablishment in 1951
Glider flying resumed in Germany on May 22, 1951, coinciding with the formal reestablishment of the Academic Flying Group of Karlsruhe. On its inaugural day, membership reached 78 individuals. Thanks to generous contributions from supporters and sponsors, the fleet expanded swiftly. In 1954, a two-seater glider (model Kranich III), named „Walter“, was acquired. The following year saw additions including a Doppelraab V6 called „Studiosus“ and a motorized aircraft Bücker 181 "Bestmann". Soon after, Akaflieg constructed its own L-Spatz 55 glider. Work on the AK-1 project began in the mid-1960s; on January 9, 1971, at 12:31 Central European Time, the AK-1 successfully completed its first self-powered flight. This marked the first post-war prototype developed by Akaflieg Karlsruhe.
Developments during the Seventies and Eighties
Flight testing of the AK-1 took place in the early seventies. On October 27, 1973, members approved initiating a new project: the AK-2—a fiberglass motor-glider designed for high performance. However, this project remained incomplete. Simultaneously, flight data computers tailored for gliding were designed and built. The AK-3 project resulted in a functional flight computer featuring an electric variometer and glide slope indicator; this device was even produced in limited quantities. A variant, AK-3R, was finalized as an approach slope calculator. The AK-4 initiative was conducted in collaboration with the Institute for Climate Research and Meteorology at Karlsruhe Institute of Technology. This project involved collecting climatic data over the Upper Rhine region using a specially equipped aircraft designed for in-flight measurements.
1980s to 2000s
The AFK-3 launch winch project commenced in 1983 and became operational by 1987. In 1984, development started on the AK-5 glider, which utilized fibre composite materials, achieving its first flight in the early 1990s. The AK-5 was further refined into the AK-5b model during the mid-1990s, with its inaugural flight occurring in 1996. Concurrently, construction began on the high-performance single-seat AK-8, which successfully flew for the first time in 2003. These projects represented a shift towards advanced CFRP manufacturing techniques and enhanced aerodynamic designs.
Akaflieg Karlsruhe today
Akaflieg Karlsruhe operates a workshop located on the west campus of the Karlsruhe Institute of Technology. Students typically fulfill their mandatory 300 annual hours of work there. The primary focus currently is the creation of the AK-X, a 15-meter class flying wing glider. Flight operations, utilizing winch launches, take place at the glider airfield in Rheinstetten near Karlsruhe’s fairgrounds, following the closure of Karlsruhe-Forchheim airport.
Gliders/ Prototypes
The following aircraft have been designed or constructed by Akaflieg Karlsruhe:
- Akaflieg Karlsruhe AK-1 "Mischl" self-launching sailplane
A single-seat glider featuring a steel tube framework combined with a fiberglass fuselage. It has a wingspan of 15 meters and is equipped with a retractable four-cylinder, two-stroke, 28 HP F10A engine from Hirth Industries.
- Akaflieg Karlsruhe AK-2
This was an adaptation based on the Glasflügel 604 glider design, retaining the motor within the fuselage—a novel feature during the 1970s. After sixteen years, this project was discontinued in favor of developing the AK-5.
- AFK-3
This innovative single-engine winch combined road driving and glider launching functions into one unit. It operates hydro-electrically, with the winch operator positioned in the passenger seat rather than a dedicated cabin.
- Akaflieg Karlsruhe AK-5 "Ardea"
A single-seat standard class glider built using fiberglass technology. The fuselage is derived from a Glasflügel 604, while the wings replicate those of Falcon—a prototype designed by Hansjörg Streifeneder that first flew in 1981. This project aimed to transfer knowledge and apply modern, cost-effective fiberglass construction techniques. Due to its straightforward handling characteristics, it serves well for training purposes. Its maiden flight took place on June 1, 1990.
- Akaflieg Karlsruhe AK-5b "Otto K.K."
An evolution of the AK-5 featuring winglets and redesigned cockpit interior. It incorporates simpler control mechanisms to facilitate student pilot training and utilizes lighter materials. The first flight occurred in 1996.
A single-seat standard class glider with a 15-meter wingspan featuring newly created elliptical wings formed using an aluminum mold. The fuselage is based on a DG-600M model. The AK-8 completed its initial flight in 2003. Following a crash, a replacement left wing was completed in 2009. Enhancements including winglets and performance improvements were added in 2014.
- Akaflieg Karlsruhe AK-9 or DG-1000J D-KAKJ "Jet"
The AK-9 project (also known as DG-1000J) focused on integrating a 400N turbine engine into a two-seat glider configuration. In partnership with KIT's "Institut für Thermische Strömungsmaschinen," research was conducted on the AMT titanium engine manufactured by Dutch company Draline. This engine was installed into an Akaflieg DG Flugzeugbau DG-1000 airframe. Due to inability to meet noise certification standards, this initiative was discontinued in 2023, and the DG-1000 was restored as a pure glider.
- AK-X
Currently under construction is a pure flying wing prototype designed for enhanced handling and performance, drawing inspiration from the Horten brothers' flying wing concept and leveraging experience from Akaflieg Braunschweig’s SB-13 Arcus. A half-scale model successfully flew in mid-2015, with work on the full-scale manned prototype ongoing since 2016.
- AK-11
The AK-11 aims to demonstrate a wing design incorporating gapless leading edge flaps within a two-seat glider platform. Extending these flaps significantly increases lift, allowing for reduced wing area and consequently higher wing loading—targeted up to 70 kg/m². This design seeks to enhance flight efficiency, especially at elevated pre-flight speeds.
References
Bibliography
- Frank-Dieter Lemke; Rolf Jacob (June 2010). "Research – Construction – Flight: The Academic Flying Groups (Akaflieg) in Germany up to 1945". Flieger Revue extra (in German). 1 (29): 18–31.
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