Sablatnig SF 4
| Sablatnig SF 4 | |
|---|---|
| Type: | Float - fighter plane |
| Design country: | |
| Manufacturer: | |
| First flight: |
1917 |
| Commissioning: |
- |
| Production time: |
1916/1917 |
| Number of pieces: |
2 |
.svg){kind=small}
The Sablatnig SF 4 was in the First World War, designed by German swimmer - fighter in Berlin-Kreuzberg based Sablatnig Flugzeugbau GmbH .
development
The SF 4 was developed in response to an invitation to tender by the naval management on August 3, 1916 for a maritime fighter to protect the naval aviation stations. The construction of the prototype with the navy number 900 was taken over by the LVG in Johannisthal , which had already carried out the production of Sablatnig aircraft with some SF 2 . The SF 4 was completed at the beginning of 1917, on February 12th it was taken over by the Navy and transferred to the Seaplane Test Command (SVK) in Warnemünde for testing , which was carried out by the Seaplane Acceptance Commission (SAK) under Walter Hormel.
The construction of a second copy with the marine number 901 began on May 1st, 1917 at the LVG and was completed exactly two months later on June 1st. This SF 2 also went to the SVK in September, but was taken over by Sablatnig on June 1, 1918 the following year and an additional middle wing was used. At the same time, the wingspan was reduced from 12.03 to 9.25 m and apparently also the wing depth, so that the wing area increased by a total of only 0.12 m². The conversion to a three - decker was completed on July 20th , but for unknown reasons it was converted back to a double-decker by September 1st after installing new hull fittings and returned to the SVK on December 1st, 1918. Ultimately, the SF 4 does not seem to have met expectations, as an order for series production was not placed.
construction
The SF 4 was - if one ignores the brief existence of the navy number 901 as a three - decker - a single-handled, staggered and braced one- and-a -half-decker with a continuous upper wing and extremely shortened lower wing. The outer wing ends of the upper wing were secured by two additional, triangular tombstones on the upper side. The hull with flat side walls ran out to the stern in a cutting edge, on which the gently rising fin was placed, underneath was a keel fin. The pilot was in an open cabin with the back of the fuselage pulled up behind it. The float system consisted of two parallel, single-stage floats, which were connected to each other and to the fuselage by struts, provided with additional wire crossings as well as tensioning wires to the lower wings.
Technical specifications
| Parameter | Data |
|---|---|
| crew | 1 |
| span | above 12.03 below 7.52 m |
| length | 6.48 m |
| height | 3.73 m |
| Wing area | 28.26 m² |
| Empty mass | 790 kg |
| Payload | 280 kg |
| Takeoff mass | 1070 kg |
| drive | a water-cooled six - cylinder in - line engine |
| Type | Benz Bz III |
| Starting power rated power |
165 PS (121 kW) 150 PS (110 kW) at 1420 rpm |
| Top speed | 158 km / h near the ground |
| Marching speed | 140 km / h |
| Rise time | 5.30 min at 1000 m altitude 14 min at 2000 m altitude |
| Armament | a rigid 7.9 mm MG 08/15 with 500 rounds |
literature
- Karl-Dieter Seifert: Josef Sablatnig, Sablatnig Flugzeugbau and its chief designer Hans Seehase . 1st edition. Nora, Berlin 2002, ISBN 3-935445-63-6 .
- Günter Kroschel, Helmut Stützer: The German military aircraft 1910–1918 . E. S. Mittler & Sohn, Herford 1994, ISBN 978-3-920602-18-9 .