Instruction:

VTOL for flaps

Wiki:
The PZL M-15 was a jet-powered biplane manufactured by WSK PZL-Mielec in Polandfor Soviet agricultural aviation. For its strange looks and noisy engine it was nicknamedBelphegor, after the noisy demon.

The aircraft was designed in Poland in response to a Soviet requirement for a new agricultural plane, for use above the very large areas of Soviet farms, the kolkhoz collectives, and state-owned sovkhoz. A requirement was that the new aircraft was to be more modern and efficient than the Antonov An-2SKh and An-2R. Poland had already produced the agricultural Antonov An-2R under licence for export back to the USSR, and agricultural planes became a Polish specialization within the Comecon. The Soviets insisted on the use of a jet engine in the new aircraft, and also participated in the design process.The chiefs of the design team were Kazimierz Gocyla and Riamir Izmailov.

In order to research new problems connected with using a jet engine in a slow agricultural biplane, an experimental plane Lala-1, forLatajace Laboratorium 1 ("Flying Laboratory 1"), was first built in Poland and flown on 10 February 1972. It used the whole forward part of an An-2, together with its wings, while the rear part was cut off and replaced with a frame construction, housing a Ivchenko-Progress AI-25 jet engine (as used on the tri-engined Yakovlev Yak-40 and the single-engined Aero L-39 Albatros fighter-trainer).[4]The Lala-1 was equipped with agricultural devices, and its testing helped inform the design of the M-15.

The first variant of the M-15 was flown on 30 May 1973, and the second prototype on 9 January 1974. During the next few years it was intensively tested, along with a pre-production series. The M-15 was shown at theParis Air Show in 1976, where it was nicknamed the "Belphegor" due to its strange look.

Serial production started in 1976. Soviet agriculture planned to order as many as 3,000 aircraft, but first experience of the M-15 in actual service was disappointing. The jet aircraft was not economical, and production ceased in 1981 after 175 aircraft were built; it was only used in the USSR. The PZL M-15 is believed to be the world's only jet agricultural plane (e.g., the world's only jet cropduster), the world's only jet biplane and the world's slowest jet, at least as far as aircraft that have been put in mass production.

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