Disc SF 28

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Disc SF 28 tandem falcon
Disc SF28 at the Aviation Center Spitzerberg
Type: Touring motor sailer
Design country:

Germany Federal RepublicFederal Republic of Germany BR Germany

Manufacturer:

Scheiben-Flugzeugbau GmbH

First flight:

1971

Number of pieces:

120

The Scheibe SF 28 , better known under the nickname "Tandem-Falke" , is a two-seater, mixed construction motor glider , which was developed from 1971 by the Scheibe-Flugzeugbau GmbH from the fuselage and tail unit of the Bergfalken IV.

construction

Front view of a tandem falcon

The tandem falcon is designed as a two-seater, cantilever low- wing aircraft in a composite construction with an unsprung central wheel chassis with support wheels. The advantage of better aerodynamics resulted from the tandem seat arrangement. The pilots sit one behind the other, which means a slimmer fuselage and less drag . In contrast to the Bergfalken IV the wing does not have a Wortmann -FX-Profilstrak, but the unstretched Göttinger Profil Gö 533.

The motor glider is designed as a pure self-starter , winch launch and aircraft towing are not permitted. A Limbach SL 1700 EA I was used as the engine. In order to optimize the gliding behavior when the engine is switched off, the propeller can be brought into a dedicated sail position. A maximum glide ratio of around 26 to 27 is achieved. When using a three-position propeller (take-off, cruise, glider), a significantly higher cruising speed is achieved than with the SF 25 .

The original maximum weight of 590 kg could optionally be increased to 610 kg after the publication of the technical bulletin 770-2 / 76 in 1976.

use

Most of the 120 copies made were sold abroad.

a tandem falcon in faience

In addition to being used in gliding, the tandem falcon is also suitable for cruising flights. The SF 28 from Sportflug-Niederberg eV was used to fly from Meiersberg to Fayence (Var) in one day . The D-KOAP of the IABG-Sportfluggruppe was flown by Wilhelm Stahl from the German Alpine Gliding School Unterwössen to the North Cape .

At least one SF 28 was used by the Spanish military under the registration number 'UE 16-1' and was not retired until April 2008.

Technical specifications

Parameter Data
crew 1
Passengers 1
length 8.1 m
span 16.3 m
height 1.55 m
Wing area 18.5 m²
Wing extension 14.5
Wing loading 31 kp / m²
Glide ratio 26 at 95 km / h
Slightest sinking 0.9 m / s at 70 km / h
Empty mass 390-410 kg
Takeoff mass 590 or 610 kg
Cruising speed 140 km / h to 170 km / h depending on the propeller
Top speed 190 km / h
Maneuver speed 156 km / h
Service ceiling 5000 m
Rate of climb 2.3 m / s
Range approx. 520 km
Engine Four-cylinder boxer engine
SL Limbach 1700 EA, 44 kW (60 PS)

See also

literature

  • Gerd Zipper: Falkenhorst. The history of the disk planes . Weishaupt, 1999, ISBN 3-7059-0059-5 .
  • PW Stahl: From the Alps to the North Cape - 7,000 km of air hiking . Motorbuch Verlag, Stuttgart 1985, ISBN 3-613-01037-2 .

Web links

Commons : Disk SF 28  - collection of images, videos and audio files

Individual evidence

  1. ↑ a b c d e ( page no longer available , search in web archives: EASA.A.107 TCDS ) ( Type Certificate Data Sheet ; PDF; 37 kB) of the SF 28 disc (replaces the LBA data sheet no.770)@1@ 2Template: Dead Link / www.easa.eu.int
  2. ↑ a b c Scheibe-Flugzeugbau GmbH: Motorglider SF 28 A TANDEM-Falke - brochure. Available online at alpenstreckenflug.de : alpenstreckenflug.de , alpenstreckenflug.de , accessed on September 14, 2012
  3. ^ Adrian Harnett, Martin Condon, Stuart Greer: Out of service military aircraft in Europe. In: eurodemobbed.org.uk. Retrieved August 8, 2015 .
  4. ↑ a b c Jens Zielke: Disc SF-28 tandem falcon. In : zielke-online.de. Archived from the original on December 26, 2007 ; Retrieved April 19, 2009 .