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Yumashiev Yu-1
AB Yumashiev built the Yu-1 glider in Kiev in 1925. Designed as a training glider, it was developed with a view to participating in the competitions that year in Crimea.
The Yumashiev Yu-1 (Russian: Юмашев Ю-1) was conceived as a single-seat training glider. It was conceived as a high-wing cantilever monoplane. The wing, with the Pr-426 profile, had a double spar structure and a trapezoidal shape in the plane.
The fuselage was built with a plywood frame structure and had an aerodynamic wing profile shape (curved at the top and flat at the bottom). The front 2/3s were covered in sheets of plywood. The tail section was covered with fabric.
The Yu-1's offset rudders featured a rounded shape.
The landing gear featured a conventional wheeled structure, but for record flights they could be concealed within the fuselage. For training flights they were kept exposed.
First flying in September 1925, the Yu-1 glider was entered in the III National Sailing Competitions held in Koktebel in 1925. On September 30, Yumashiev managed to stay in the air in this glider for 1 hour and 30 minutes, which was a national record.
A day later, on October 1, Yumashiev at the controls of the Yu-1 would achieve for the first time in the USSR, a long-distance flight taking advantage of thermal currents. This flight recorded 4800 meters and was considered a national record, because in the competitions the longest flight value would be 24.4 km, reached by the German Nering on his “Consul” glider. For this flight Yumashiev would receive the award for second place in the competition.
Yumashiev Yu-1
Wingspan: 12.20 m
Wing area: 17.20 m²
Length: 5.70 m
Empty weight: 83 kg
Wing loading: 9.5 kg / m²
Rudder surface area: 2.00 m²
Ailerons surface: 3.00 m²
Wing elongation ratio: 8.7
Accommodation: 1

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