BŻ-1 Gil

The year 2020 marked the 70th anniversary of the first flight of the BŻ-1 Gil, the first experimental helicopter of Polish design. It was created at the experimental production facility of the Główny Instytut Lotnictwa (Main Institute of Aviation) in Warsaw, initiated by Zbigniew Brzoska.

Pioneering Design and Development

Work began in 1948. Bronisław Żurakowski was the chief designer, responsible for the main rotor and control system. Engineer Tadeusz Chyliński designed the fuselage, tail boom, tail rotor, and landing gear, while engineer Zbigniew Brzoska handled the powerplant and drive. The project incorporated some German parts remaining after the war, including a Hirth engine and wheels from a Kranich glider’s launch trolley.

Initially, the helicopter had no official name, only the registration marks SP-GIL, derived from an abbreviation of the institute’s name. Because of these marks, it earned the nickname “Gil,” and the designation BŻ-1, based on the chief designer’s initials.

First Flight and Technical Hurdles

The prototype’s construction was completed in 1949, with its first successful flight taking place on April 4, 1950. During these initial flights, the aircraft was piloted by Żurakowski himself—remarkably, these were his first helicopter flights, and as a pilot no less. Frequent breakdowns of various drive mechanisms hampered testing. Vibrations also posed a significant challenge, contributing to numerous failures in helicopter designs worldwide.

In 1951, during routine maintenance, vibrations were significantly reduced by installing a special resonance damper on the rotor. This original solution was proposed by engineer Zbigniew Brzoska and implemented by engineer Bronisław Żurakowski.

After an accident in 1953, testing was halted. The helicopter was repaired but not permitted to fly again until the autumn of 1956. For continued flights, the structure was reinforced and modified. Following another accident in 1957, flights were permanently ceased, and the helicopter was decommissioned.

Legacy and Restoration

From a modern perspective, its design appears primitive, but it is important to remember it was an experimental prototype. The aircraft was intended to gain experience in an uncharted field. It was built at low cost in a war-devastated country where funding for research was scarce, yet as an innovative concept, it was ideal for testing.

It is regrettable that Poland did not continue its work on indigenous designs at the time, opting instead for the licensed production of Soviet helicopters. The beginning had been promising, especially as Poland embarked on this field almost simultaneously with other world-renowned designers and manufacturers who also faced failures, accidents, and disappointments before achieving success.

The helicopter never received an official name, only its registration mark SP-GIL. While some publications refer to it as BŻ-1 “Gil,” this is more of a literary convention for clarity. In late October 1960, the helicopter was removed from the aircraft registry and transferred first to the Museum of Technology in Warsaw, then to the Museum of Aviation in Krakow.

Due to poor storage conditions, the helicopter was severely damaged, and some components were missing. In 1987, initiated by enthusiasts from the Institute of Aviation, the idea of restoring the aircraft emerged. This was carried out at the Institute of Aviation’s Experimental Production facility. On April 29, the restored helicopter was handed over to the Krakow Museum.

Technical Specifications

Modification	BŻ-1
Main rotor diameter, m	8.80
Length, m	8.50
Height, m	3.00
Empty weight	510
Maximum takeoff weight	610
Engine type	1 Piston engine Hirth HM 504
Power, kW	1 x 105
Maximum speed, km/h	140
Cruising speed, km/h	120
Practical range, km	260
Rate of climb, m/min	150
Practical ceiling, m	2000
Crew, crew members	2

Image and diagram gallery of the BŻ-1 Gil

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