RWD-5 and RWD-5bis technical description and technical specifications

RWD-5 was cantilever high-wing monoplane, of mixed structure - welded steel pipe fuselage, wooden wings and stabilizers. It had a comfortable full-glass covered cabin, high speed and large operating range. It was one of the first in Poland and in the world tourist airplanes with a fully closed, glass covered cabin. Convenience of flying was increased by a noise muffler installed on the exhaust gas pipe, and cabin heating with hot air taken from a heater installed on the exhaust gas pipe. The airplane had a wonderful view from the cabin, but limited by wings in upper section. The airplane had an outstanding manouverability and other flight characteristics, thanks to the use of the revelational wing, which construction was designed in accordance with technical documentation of the yet unbuilt wing to the PZL-3 bomber by engineer Władysław Zalewski.

Specifications:

  serial RWD-5 RWD-5bis
crew 1 pilot + 1 passenger 1 pilot
egine Cirrus "Hermes IIIB" / "Hermes IV" / "Gipsy III / Walter "Junior" DH Gipsy "Major"
nominal engine power 115/130/120/120 KM 130 KM
Dimensions    
wingspan 10.2 m 10.2 m
length 7.2 m 7.2 m
height 2.05 m 2.05 m
fuselage wing chord 1.75 m 1.75 m
wing area 15.5 m2 15.5 m2
wing profile Bartel 37 IIA Bartel 37 IIA
CX min 0.035 0.035
CZ max 1.35 1.35
Masses    
empty airplane 430-460 kg 447 kg
payload 445 kg 654 kg
total take-off mass 760 kg 1100 kg
Loads    
max area load 49 kg/m2 71 kg/m2
max thrust load 6.3 kg/KM 9.2 kg/KM
Performance    
max speed 202 km/h 210 km/h
cross-country speed 177 km/h 175 km/h
min speed 75 km/h b.d.
landing speed (with max load) b.d. 90 km/h
theoretical max range 1080 km 5000 km
flight endurance 6 h 29 h
climb 4.6 m/s b.d.
ceiling 4700 m b.d.
take-off run 110 m b.d.
fuel consumption 22 l/h 26 l/h

Construction description

Wing:

Cantilever, trapezoidal, wooden structure, two spars, fastened to the fuselage framework with four clamps. Plywood torque box up to the forward spar, coverage was cloth further. Elastic trailing edge connecting rib ends extended from the fuselage to the ailerons. After the coating was tightenedthere were characteristic bogging. Ailerons - cantilever, differential +10o/-25o.

Fuselage:

Framework of welded cro-mo steel pipes, covered with cloth stretched on the wooden framing. Dual controls in the cabin, seats placed in a tandem configuration. Control stick from the back seat could be removed. The baggage holder was behind the back seat. Two doors (one in RWD-5bis), on the right-hand side, dropped out in emergency. Control panel was equipped with speedometer, altimeter, compass, time clock, engine-speed indicator, oil manometer and fuel indicator. Cabin was heated with hot air taken from heater installed on the exhaust gas pipe. Engine noise muffler was installed on exhaust gas pipe (it was removed on RWD-5bis). RWD-5bis in the place of the back seat had additional fuel tank of capacity 300 liters, the doors and windows for back seat were removed. RWD-5bis had more comfortable pilot's seat, designed for long flights, with rubber pneumatic pillows, armrests, footrests and lighting for night flights.

Stabilizers:

Cantlever, wooden construction, covered with plywood. Control surfaces without balancing surfaces and trimming tabs, covered with cloth. Horizontal stabilizer adjustable during flight with a handwheel placed on the left-hand side of a pilot's cabin.

Instalations:

Fuel tanks of capacity 110 liters in center of wing section. On RWD-5bis an additional tank of capacity 300 liters was installed in place of the back seat, and two additional wing tanks, each 113 liters were installed. Oil tank of capacity 35 liters was placed just in front of the pilot's seat, under the cabin's floor.

Landing gear:

Fixed, two wheels, with tail landing skid, three-legs, oil-air shock absorbtion. Tail landing skid half-springing, not controllable. Wheels with low-pressure tyres suspended on forked rocker arm supported on shock-absorbing angle strut and shielded with alluminium fairings. Some models of RWD-5 were equipped with wheel brakes. SP-AGJ prototype had high-pressure tyres and three-legs with shock-absorber supporten on lower fuselage section. The shape of wheel fairings differed on different models.

Propeller:

Wooden, two-blades, fixed.