Polikarpov PM-1
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| Polikarpov PM-1 | |
|---|---|
| General information | |
| Type | Airliner |
| National origin | Soviet Union |
| Manufacturer | Polikarpov |
| Designer | Aleksander Aleksandrovich Syemyenov |
| Number built | 1 |
| History | |
| First flight | 10 June 1925 |
The Polikarpov PM-1 was a passenger aircraft created by Polikarpov in the 1920s.
The PM-1 (PM - Passazhirskii Maybach – passenger transport Maybach engine) was a wooden biplane with a monocoque fuselage built up from glued ply veneer sheets (known as Sphon), including the integral tail-fin. The two-spar wings were skinned in plywood forward of the main spars and covered in fabric aft of the main-spars. All control surfaces were built in a similar fashion with ply-skinned structural members and built-up wooden structure covered in fabric. Large I-type inter-plane struts, canted at about 30°, and steel cables braced the wings, which were attached to the fuselage at the top and bottom of the main fuselage frames. The undercarriage consisted of 2 main-wheels on a live axle supported by V-stuts with bungee springing. The Maybach Mb.IVa engine was mounted conventionally in the nose and had a retractable radiator forward of the undercarriage.[1]