Caspar U 1

Caspar U 1
Type:	Patrol seaplane
Design country:	German Empire
Manufacturer:	Caspar-Werke AG
First flight:	1922
Number of pieces:	2 + 2 U 2

The Caspar U 1 was a seaplane from Caspar-Werke AG , which was designed by Ernst Heinkel in the 1920s. In addition to the Caspar S I , the U 1 was one of the first drafts of the Caspar works, which reopened in Travemünde in 1922 .

history

According to the specifications of the United States Navy , Ernst Heinkel, who was able to fall back on experience with the Hansa-Brandenburg W.20 , constructed a small double-decker that was to be carried on board of submarines. For this it was necessary to be able to assemble and disassemble the aircraft quickly. The dismantled aircraft had to fit into a 7.40 m long cylindrical container with a diameter of 1.70 m. According to other sources, the dimensions were only 6 m and 1.50 m. The short assembly time was achieved through the design as a cantilever (strut and tension-free) double-decker. Four technicians are said to have assembled the aircraft in 1:03 minutes. Other sources speak of 3:20 min; an airplane delivered to Japan was upgraded or disarmed by five people in about 15 minutes.

Two U 1s (A.6434 and A.6435) were delivered to the US Navy in 1922. Of the two insignificantly modified U 2s with the more powerful Oberursel engine planned for Japan , only one was delivered, while the D-293 was being tested by the Imperial Navy.

construction

The aircraft was largely made of wood. The upper and lower wings had wooden spars and ribs with plywood paneling. The two single-stage wooden floats were attached to the hull with tubular steel struts that were braced lengthways with wire. The cockpit was immediately behind the upper wing. An armament was not provided.

Technical specifications

Parameter	Data (U 1)	Data (U 2)
crew	1
length	6.20 m	6.18 m
span	7.20 m
height	2.59 m
Wing area	14.00 m²
Preparation mass	360 kg	345 kg
payload	88 kg	41 kg
Takeoff mass	572	510 kg
Top speed	145 km / h near the ground 142 km / h at 1000 m altitude 138 km / h at 2000 m altitude 134 km / h at 3000 m altitude	150 km / h near the ground
Cruising speed	120 km / h near the ground	130 km / h near the ground
Landing speed	60 km / h	k. A.
Rise time	6 min at 1000 m 15:34 min at 2000 m 34:52 min at 3000 m	k. A.
Range	360 km	250 km
Service ceiling	3000 m
Engine	an air-cooled five-cylinder - radial engine Siemens & Halske Sh 4	an air-cooled seven-cylinder - star - rotary engine Oberursel U 0
Starting power rated power	62 PS (46 kW) 58 PS (43 kW) on the ground	84 PS (62 kW) 84 PS (62 kW) on the ground

Web links

Commons : Caspar U.1 - Collection of pictures, videos and audio files

Individual evidence

^ ^A ^b ^c Hans-Jürgen Becker: Seaplanes - flying boats, amphibians, float planes . In: German aviation . 1st edition. tape 21 . Bernard & Graefe Verlag, Bonn 1994, ISBN 3-7637-6106-3 , p. 138 .
↑ AERO , issue 47, p. 1316.
^ ^A ^b Helmut Stützer: The German military aircraft 1919–1934 . Mittler, Herford 1984, ISBN 3-8132-0184-8 , pp. 115 .
↑ ^a ^b Stützer, military aircraft, p. 174.

[Becker1994-1] A ^b ^c Hans-Jürgen Becker: Seaplanes - flying boats, amphibians, float planes . In: German aviation . 1st edition. tape 21 . Bernard & Graefe Verlag, Bonn 1994, ISBN 3-7637-6106-3 , p. 138 .

[AERO-2] AERO , issue 47, p. 1316.

[Stuetzer-3] A ^b Helmut Stützer: The German military aircraft 1919–1934 . Mittler, Herford 1984, ISBN 3-8132-0184-8 , pp. 115 .

[Stützer-4] Stützer, military aircraft, p. 174.