FTAG Esslingen E11
| FTAG Esslingen E11 | |
|---|---|
| Type: | Pilot glider |
| Design country: | |
| Manufacturer: |
FTAG Esslingen |
| First flight: |
August 14, 1965 |
| Number of pieces: |
1 |
The FTAG Esslingen E11 was a two-seater test glider of the Flugtechnischen Arbeitsgemeinschaft (FTAG) at the State Engineering School Esslingen with a strongly negative swept wing. The aircraft with the registration number D-9343 flew for the first time on August 14, 1965 in Kirchheim / Teck .
history
In 1952, after the re-establishment of the FTAG after the Nazi era, work began on a glider design on which a heavily swept wing was to be examined. In doing so, it was possible to fall back on the experience of group member Siegfried Holzbaur as a single flyer of the Junkers Ju 287 . In order to meet the flight training needs of the members, the aircraft should be usable as a training aircraft and its flight characteristics and performance should correspond to the double-decker .
construction
The design of the E11 from 1953 envisaged a shoulder- wing decker with wooden wings and a tubular tubular steel frame fuselage that was spacious enough for the installation of measuring devices. The two-seater cabin had a row of seats and double rudders . On the main spar, which was swept forward by 25 °, only four ribs were attached to each wing. Profiling strips between these and two auxiliary spars in front of and three behind the main spar formed a framework on which the covering was applied. The torsion box was created using plywood on hard styrofoam , which was also supported on the main ribs by the auxiliary spars. The fin as part of the fuselage framework was a fiberglass covered -shell and carried a highly damped set horizontal stabilizer below the rudder was a braking parachute housed. The plane had a sprung wheel and a grinding spur on the tail. The Göttingen Gö 682 profile was used on the wing, unchanged in the area of the ailerons and thickened to 18% inside up to the wing root. In the interior, the wing was twisted by -4 ° .
use
The glider took the summer meeting at Idaflieg in Braunschweig-Waggum part. It was easy to control in the speed range from 70 to 90 km / h, and initial tumbling during fast aircraft tow plows could be reduced by increasing the rudder depth by 10 cm. The sideslip was possible in stall was at rearward positions, the danger of "super stable" because the horizontal stabilizer downwind of the wing was. The plane was heavily tail-heavy. Because the maximum take-off mass was exceeded, it was not possible to trim the front center of gravity.
Technical specifications
| Parameter | Data |
|---|---|
| crew | 1 + 1 |
| Hull length | 7.33 m |
| span | 12.50 m |
| Torso height | 1.45 m |
| Trunk width | 0.65 m |
| Wing area | 20.00 m² |
| Wing extension | 7.8 |
| Glide ratio | 22nd |
| Slightest sinking | 1 m / s |
| Payload | 120 kg |
| Preparation mass | 300 kg |
| Takeoff mass | 420 kg |
| Wing loading | 21 kg / m² |
| Top speed |
