Chyetverikov SPL
The Tschetwerikow SPL (Russian Четвериков СПЛ ) was the project of a Soviet micro flying boat of the 1930s. It should be carried by submarines in the folded state and used as needed for clarification. Therefore, it was designed so that it could be built ready to fly in four minutes. The term SPL stands for " Samoljot dlya podwodnoi Lodki " ( самолёт для подводной лодки, aircraft for submarines ). Two prototypes were built and tested.
Development
The designer Igor Tschetwerikow made 1931 the Soviet Seekriegsflottenführung the proposal to develop a small, collapsible flying boat for the planned large submarines that were to come on the oceans for use. Only two years later, his proposal was accepted. Since Tschetwerikow now by the Central Construction Office to the Department " OSGA " of the Institute of Civil Aviation ( NII GWF ) was changed, the first prototype was designated OSGA -101 ( ОСГА -101).
Work began in autumn 1933. The aircraft consisted of a two-stage, keeled hull made of wood with two tail booms from steel tube. About the body of the 75 -kW radial engine M-11 was attached to a water spray boom. The first prototype was designed as amphibian and had a manually retractable wheeled undercarriage.
The first flight took place in the spring of 1934 and ran without problems. Then, still resulted in a scaled- second test model called Gidro -1 ( Гидро -1), which was a pure flying boat. When folded, it had a size of 2.12 m × 2.75 m × 7.45 m and found in a cylindrical watertight tube of 7.5 m length and 2.85 m in diameter on a submarine deck space. Although the testing of the end of 1934 to 29 August 1935 showed excellent flight characteristics, but the hydrodynamic parameters left something to be desired, which is why the naval staff lost interest in this project. The Gidro -1 OSSOAWIACHIM was passed in 1935 and presented at the Milan aviation exhibition to the public.
The OSGA -1 flown to 1937 with the pilot A. W. Krschischewski three world records. On September 21, he reached on a 100 - km route at a speed of 170.2 km / h On October 7, a peak altitude of 5400 m and a range of 480 km was achieved.