Aeroput MMS-3
| Aeroput MMS-3 | |
|---|---|
 |
|
| Role | Light transport / Utility |
| National origin | Serbia |
| Manufacturer | Aeroput workshops, Zemun, Serbia |
| First flight | January 1936 |
| Primary user | Aeroput |
| Number built | 1 |
The Aeroput MMS-3 (Serbian Cyrillic: Аеропут ММС-3) was the first Serbian twin-engined light three-seater passenger aircraft, produced by Aeronautical service of Aeroput for his own needs in 1935 year. The chief designer was the aviation engineer Milenko Mitrović - Spirta, the CTO of Aeroput.
Work on the design of aircraft Aeroput MMS-3 was conducted in 1934, the designer was aeronautical engineer Milenko Mitrović - Spirta, whose initials are on the plane as the MMS label (such was then the custom among constructors of Yugoslav aircraft). The number on the label represents a 3-seater passenger plane. Mr Milenko Mitrović - Spirta was then technical director of Aeroput and suggested that the Board of Directors on the basis of his project, which was in March 1934 tested in the Eiffel wind tunnel in Paris, made for Aeroput in his workshop for repairing aircraft an airplane which would be used as aviotaxi, for whom he felt a great need. The constructor then tried several configurations, including inline and stellar engines, without guards and shields, placed at different distances from the gondola hull. Finally, selected system characterized by aerodynamic perfection of Class 12, in those years achieved only by a very good gliders. During 1935 the prototype is made, which take-off for the first time in January 1936. The first flight and test of aircraft conducted by pilot Vladimir Striževski - Striž head of Aeroput transport pilots. As the plane showed good performance, in the same season in 1936 year is included in the traffic.
The MMS-3 was a twin-engine high-wing monoplane of wooden construction with the fuselage covered with plywood, and the wings with fabric, intended primarily for avio taxiing. It was powered by two 88 hp (66 kW; 90 PS) Pobjoy Niagara III 7-cylinder piston radial engines. These engines were characterized by low fuel consumption and very quiet operation, allowing greater passenger comfort. Airplane was launched by two bifurcated wooden propellers with fixed steps. For that time the plane had unusual concept, instead of conventional fuselage, in the extension of the engine carrier had two tail fins (bi-fuselage). Fuel tanks were located in the wing between the two engines with fuel capacity of 265 l (70 US gal). Cabins of pilots and passengers represent one unit, which like gondola is located below the airplane wings. Cabin had a large window area that provided excellent visibility to the pilot and passengers. This made it an extraordinary airplane for panorama flights. He had a fixed landing gear of a conventional type, tail wheel was located at the rear of the gondola fuselage and the main gondola wheels were mounted on one side of the gondola fuselage and on the other side to engine mount. The main wheels have aerodynamic fenders. In 1940 year, the MMS-3 was used to test the tricycle undercarriage with the front wheel. During this time the engineer Mitrović and Prof. Dr. Ing. Miroslav Nenadović worked together on the project of twin engine light bomber who work called Nemi, and that was supposed to have a similar arrangement which is used in aerodynamics of the MMS-3, but with a tricycle undercarriage. The project Nemi was never realized.
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