HWL Pegaz

Pegaz
HWL Pegaz in the Polish Aviation Museum
Role	Motor glider Type of aircraft
National origin	Poland
Manufacturer	Warsaw's Goclaw Aircraft Plant 6
Designer	Tadeusz Chyliński
First flight	16 July 1949
Retired	1964
Status	at Polish Aviation Museum in Kraków
Primary user	Warsaw Aviation Club
Produced	1947-1948
Number built	1

HWL Pegaz was the first Polish post-war motor glider, a single-seat mid-wing monoplane with a pusher propeller and twin tail boom, which was designed and constructed by Tadeusz Chyliński and was built in Warsaw-Goclaw Aircraft Plant 6.^[1]

Design and development

During 1945 and 1946, Tadeusz Chyliński took part in a competition of the Civil Aviation Department for developing a training motor glider. He won first prize for his project, the HWL Pegaz motor glider. From 1946 to 1947, Tadeusz Chyliński based on an agreement with the Department of Civil Aviation (Departament Lotnictwa Cywilnego) with the help of

sports in inexpensive aircraft. The engine for the "Pegaz" was designed by Stefan Gajecki, who was well known for designing skimming boat motors. Construction began on the "Pegaz" at the HWL (Harcerskie Warsztaty Lotnicze - Scouts' Aircraft Works) in Warsaw. In 1948, the work was taken over by Warsaw's Gocław Aircraft Plant 6. The motor glider (one for flying and two unassembled) was finished in spring of 1948. The engineless plane was on display at the Aviation Day in 1948. "Pegaz" was test-flown on July 16, 1949, piloted by Bronisław Żurakowski and Jerzy Szymankiewicz. The factory and since August 1964.

Design specifications

• Characteristic: dual-boom monoplane with pusher propeller, three-wheel landing gear with forward steerable wheel, all wood construction.
• The
  turn indicator, ignition switch and fuel pump. The cabin also features an air throttle valve and decompressor, a fuel gauge and fuel valve. The motor glider is steered by a stick and rudder bar. The pilot's seat is made to accommodate a backpack parachute
  .
• The wooden
  aerodynamically
  -compensated, differentially displaced 30° upward and 18° downward. The wing has a fixed slot at the edge of attack.
• The twin vertical tail is located at the boom tips. The elevator unit is located between them. The monospar fins are sheathed in laminated wood. The control surfaces on the wooden frame are canvas-sheathed.
• The three-wheel
  aft
  of the fuselage pod between the wheels is protected against major deflection of the landing gear by an ashwood skin with an inner-tube shock absorber.
• The motor glider is powered by an XL-GAD prototype engine. It is a four-cylinder flat two-cycle air-cooled engine. Two cylinders have a decompressor to facilitate startup. The wooden pusher propeller has a fixed pitch and diameter of 1.42 meters. The 30-liter fuel tank is located to the fore of the engine.
• Paint - The "Pegaz" was painted a cream color. The wing's edge of attack, registration number and fuselage arrow were painted navy blue.

Features

The "Pegaz" proved to be very safe and easy to pilot during testing and operation. It was stable in every axis with the controls released. By

load range up to 4 g. It could do loops at a speed of 125 km/h without losing altitude and ended loops with the same speed. The "Pegaz" behaved totally normal in dives at 210 km/h.

Operators

 Poland

• Aeroklub Warszawski operated one aircraft in Warsaw.

Survivors

The HWL Pegaz (SP-590) is preserved in the Polish Aviation Museum in Kraków, from 1964

Specifications

Data from Motorsegler Pegaz^[2]

General characteristics

• Crew: 1
• Length: 6.85 m (22 ft 6 in)
• Wingspan: 11.7 m (38 ft 5 in)
• Height: 1.6 m (5 ft 3 in)
• Wing area: 14.8 m² (159 sq ft)
• Aspect ratio: 9.2
• Empty weight: 270 kg (595 lb)
• Gross weight: 397 kg (875 lb) ^{[citation needed]}
• Max takeoff weight: 390 kg (860 lb)
• Powerplant: 1 × Gajęcki XL-Gad 4-cylinder air-cooled horizontally-opposed two-stroke piston engine, 23 kW (31 hp) (designed by Dipl. Ing. Stefan Gajęcki)
• Propellers: 2-bladed fixed-pitch pusher propeller

Performance

• Maximum speed: 129 km/h (80 mph, 70 kn)
• Cruise speed: 110 km/h (68 mph, 59 kn)
• Stall speed: 59 km/h (37 mph, 32 kn) ^{[citation needed]}
• Never exceed speed: 210 km/h (130 mph, 110 kn)
  
• Landing speed: 59 km/h (37 mph; 32 kn)
• Range: 275 km (171 mi, 148 nmi)
• Service ceiling: 3,000 m (9,800 ft)
• g limits: +4g
• Maximum glide ratio: 15.5
• Rate of climb: 2 m/s (390 ft/min) engine on, still air
• Rate of sink: 1.25 m/s (246 ft/min)

References

Further reading

• Rafał Chyliński, Motoszybowiec Pegaz i jego konstruktor Tadeusz Chyliński, Agencja Wydawnicza CB, 2015. (in Polish)
• Rafał Chyliński, Moja Pasja Lotnictwo. Życie i działalność Tadeusza Chylińskiego dla Polskiego Lotnictwa w świetle dokumentów, Agencja Wydawnicza CB, 2017. (in Polish)

External links

• Motor glider-Pegaz
• Pegaz
• Photos