Akaflieg Stuttgart fs 25

Akaflieg Stuttgart fs 25 "Cuervo"
Type:	Glider
Design country:	BR Germany
Manufacturer:	Akaflieg Stuttgart
First flight:	January 30, 1968
Number of pieces:	2

The Akaflieg Stuttgart fs 25 "Cuervo" is a glider from Akaflieg Stuttgart .

history

The "Cuervo" ( Spanish , German " Rabe ") was created in 1966 as a continuation of the fs 23 "Hidalgo" as an aircraft for the standard class. The "Hidalgo" wing design with the help of the mainframe computer UNIVAC 1107 of the Institute for Statics and Dynamics of Aerospace Structures at the University of Stuttgart was adopted and the existing wing shapes were extended to 15 meters. Wind tunnel measurements on hulls had shown that a strong constriction reduces the resistance . The first flight took place on January 30, 1968 in Schwäbisch Hall .

In 1974, the wing shapes and the construction documents were awarded to Jacques Teissier from the French state university of applied sciences (Ecole Nationale Supérieure de Mécanique et d'Aérotechnique - ENSMA) in Poitiers , with their glider group, Société Scientifique de Recherche et de Promotion du Planeur Léger (SSRPPL), founded in 1971 Akaflieg Stuttgart was in close contact. According to structural calculations, the load test on a broken wing followed in 1976 and after 800 hours of work on February 25, 1981, the first flight of the FS-25F. After the aircraft was forgotten and remained in the trailer for twenty years, it was overhauled from 2011 and hung in the entrance hall of ENSMA since 2013.

construction

The fuselage is made up of a tubular steel framework, to which a conical aluminum tube manufactured by the United Flugtechnische Werken (VFW) in Speyer was connected as a tail unit support . The boat hull forms a GRP - Balsa - Sandwich tray. Because of the large constriction, the wing fittings of the PIK-16 "Vasama" were used. The highly swept wing has, because of their low height and wide spar cap DFS - flaps at the trailing edge, the elevator designed as a pendulum tail is with balancing mass and aerodynamic clad rigid, unsprung suspension.

The French replica FS-25F received a newly designed wing fitting and a retractable landing gear using parts of a Ka-6E break.

Technical specifications

Parameter	Data Akaflieg Stuttgart fs 25	Data SSRPPL FS-25F
First flight	January 30, 1968	February 25, 1981
crew	1
Hull length	6.48 m
span	15.00 m
height
Wing area	8.53 m²
Wing extension	26.38
Wing profile	FX 66-S-196, FX 61-168, FX 61-147, FX-60-126
Glide ratio	38.5 at 87 km / h
Slightest sinking	0.60 m / s at 79 km / h
Preparation mass	154 kg	183 kg
Max. Takeoff mass	250 kg	270 kg
Top speed		200 km / h

Web links

Commons : Akaflieg Stuttgart FS-25 - Collection of images, videos and audio files

fs 25 with pictures and three-sided view on the website of Akaflieg Stuttgart

Individual evidence

↑ Academic Fliegergruppe Stuttgart e. V. (Ed.): 1926-1976 . 50 years of Akaflieg Stuttgart. Self-published, February 1976, p. 127-130 .
↑ ^a ^b SSRPPL Cuervo 1. In: j2mcl-planeurs.net. Retrieved January 15, 2019 (French).
↑ ^a ^b ^c Peter F. Selinger: FS-25F: French brother of the FS-25 . In: Flugrevue + Flugwelt . No. 4 , 1981, p. 76 .
↑ fs 25 . In: Akaflieg Stuttgart (Ed.): Annual report . 1967, p. 5-9 .
^ Dietmar Geistmann: Gliders in Germany . 2nd Edition. Motorbuch Verlag, Stuttgart 1994, p. 65 .

[1] Academic Fliegergruppe Stuttgart e. V. (Ed.): 1926-1976 . 50 years of Akaflieg Stuttgart. Self-published, February 1976, p. 127-130 .

[j2mcl-2] SSRPPL Cuervo 1. In: j2mcl-planeurs.net. Retrieved January 15, 2019 (French).

[Selinger-3] Peter F. Selinger: FS-25F: French brother of the FS-25 . In: Flugrevue + Flugwelt . No. 4 , 1981, p. 76 .

[4] s 25 . In: Akaflieg Stuttgart (Ed.): Annual report . 1967, p. 5-9 .

[5] Dietmar Geistmann: Gliders in Germany . 2nd Edition. Motorbuch Verlag, Stuttgart 1994, p. 65 .