Sablatnig SF 2
|Sablatnig SF 2 (BFT)|
|Type:||Maritime reconnaissance aircraft|
December 1915 – August 1917
|Number of pieces:||
The Sablatnig SF 2 was a German military aircraft at the time of the First World War . The marine designation was BFT for "B-aircraft with FT transmitter", which stood for an unarmed two-seat seaplane with radio equipment.
Josef Sablatnig developed the SF 2 from its predecessor SF 1 , which remained a one-off and was taken over by the Navy in October 1915 . Quite satisfied with the aircraft, the naval management placed a series order for 16 aircraft for the new aircraft. Thus the SF 2 was Sablatnig's first seaplane to be built in series . But since he was only able to found his own company, Sablatnig Flugzeugbau GmbH Berlin, on October 5, 1916 , Richard Goetze KG in Treptow took over the construction. In contrast to the SF 1, the SF 2 had a smaller wing area with an enlarged tail unit and changed wing spars and struts, which allowed the mass to increase somewhat. In June 1916, testing of the prototype with the navy number 580 began. During the subsequent acceptance flights, the SF 2 crashed into the Baltic Sea off Warnemünde in July and was badly damaged. After further changes to the tail unit, the floats and the arrangement of the wing struts, the acceptance could be completed and in May 1916 the Navy increased its order by another ten aircraft, the construction of which was carried out by the LFG . Another 20 units were ordered in October of that year, this time being built by LVG . In November 1916 Goetze KG delivered the last copy of the first series. The production of the other two construction lots was completed in April / May and July / August 1917 respectively
A total of 46 SF 2 were produced, which were used in the North and Baltic Sea region. The SF 5 was developed from the SF 2 .
The SF 2 was a two-legged, braced, two-seat biplane with a continuous upper wing of constant depth with sloping ends, on the outer top of which two additional tombstones were attached. The lower wing was constructed in two parts, connected to the lower chords of the fuselage and had a sweep of 3.5 °. The stagger to the upper wing was 20 °. Both wings were two-spar wooden structures with fabric covering. The three-stage twin wooden floats had a flat bottom, flat sides and a curved top. The crew cabins were open and arranged one behind the other, separated from one another, with the pilot seated in front and the observer behind.
|Wing area||56 m²|
|Empty mass||1078 kg|
|Takeoff mass||1697 kg|
|Top speed||130 km / h at sea level|
|Climbing time to 1500 m||18 min|
|Service ceiling||2500 m|
|Engines||a water-cooled six - cylinder in - line engine Mercedes D III , 160 PS (118 kW) starting power|
- Hans-Jürgen Becker: Seaplanes - flying boats, amphibians, float planes . In: German aviation . tape 21 . Bernard & Graefe, Bonn 1994, ISBN 3-7637-6106-3 , pp. 91 .
- Wilfried Copenhagen: Floatplanes of the First World War . In: Peter Bork (Ed.): Fliegerkalender der DDR 1986 . Military Publishing House of the GDR, Berlin 1985, p. 218/219 .
- Karl-Dieter Seifert: Josef Sablatnig, Sablatnig Flugzeugbau and its chief designer Hans Seehase . 1st edition. Nora, Berlin 2002, ISBN 3-935445-63-6 , pp. 35-38 .
- ↑ Copenhagen, p. 218
- ^ Günter Kroschel, Helmut Stützer: The German military aircraft 1910–1918 . Mittler, Herford 1977, ISBN 3-920602-18-8 , pp. 145 .