History Construction Tally

PZL PZL-30, LWS-6 Żubr. 1936.

Kraków 2020-02-15

00136c Section 1936-03-15

Państwowe Zakłady Lotnicze PZL-30, LWS-6 Żubr

Poland

Construction

LWS-6 A. Photo by LAC
LWS-6 A. Photo by LAC

LWS-6. Front cabin. Photo by LAC
LWS-6. Front cabin. Photo by LAC

LWS-6. Tower with weapons. Photo by LAC
LWS-6. Tower with weapons. Photo by LAC

Construction

LWS-6 Żubr is a bomber plane, built in the system of the high-wing aircraft. The aircraft's structure is mixed: metal and wood. Four-man airplane crew.

Wings

Rectangular-trapezoidal wings with rounded ends. Double-girder structure covered with multilayer plywood. The wings have flaps and ailerons. Slotted flaps. Shuttlecocks. Landing spotlights were installed in the wings.

Fuselage

Metal structure fuselage, duralumin was used in the front, chromium-molybdate pipes in the back. The hull has a rectangular cross-section, rounded from above and below. The upper part of the hull was covered with sheet metal, and remained canvas. The hull is technologically divided into three parts: front, middle and rear. The parts are connected by screws. The pilot is sitting in the cockpit located on the top of the fuselage, on the left. The commander takes a seat in the nose of the plane. The commander acts as a navigator, bombardier, gunner and pilot. Additional tiller and basic pilot instruments are in the nose. The other two crew members are gunners, mechanics and radiotelegraphists. The plane has a radio station, radio finder, instruments for night flights. The rear shooting position is a retractable upper turret, equipped with two rifles. The lower firing position received a closed flap. In the sides of the fuselage there were windows through which fire could be fired. Front and rear doors are located in the starboard side.

Tail

The tail formation is classic. Welded construction made of steel pipes, covered with canvas. The horizontal formation is supported by braces.

Chassis

Chassis with tail wheel. All wheels single. Main landing gear, initially retractable by a screw mechanism, to the sides of the fuselage. Later, the main chassis is electrically retractable in engine nacelles.

Armament

The LWS-6 Żubr armament consists of three positions with machine guns. The lower and upper stands are rotated electrically on Alcan turntables. The upper position has two machine guns, the lower one and the front one. All rifles are 7.9 mm Vickers F. The crew takes 17 magazines on board, each with 96 cartridges. The aircraft has a bomb chamber with a door from the bottom of the fuselage. The plane takes on board 440-660 kg of bombs. The bomb chamber has a double-deck Alcan 5 ejector that takes 8 bombs weighing 50 kg or 100 kg. The bombs can be hung on ejectors located under the wings. You can hang 4 bombs weighing 50 kg and two illuminating bombs weighing 12.5 kg. The bombs can also be hung under the hull itself, in the amount of 4 pieces weighing 50 or 100 kg. The crew has at their disposal the PZO RH-32 bombing sight.

Engines

The engines in the PZL-30 BI version are Pratt & Whitney Wasp Junior, with 295 kW (400 hp) and 309 kW (420 hp) instantaneous power. Two-blade wooden propellers. Later, three-blade, metal, adjustable (two positions) Ratier, with a diameter of 3.6 m.

Engines in the LWS-6 Żubr version are PZL-Bristol Pegaz VIII, with a power of 500 kW (680 hp). Three-blade propellers, metal, adjustable (two positions) Hamilton Standard, diameter 3.6 m.

The fuel supply is 1 240 liters. Fuel consumption is 310 liters per hour.

Data T-T PZL-30 BI

Span 18.50 m

Length 15.40 m

High 3.50 m

Bearing area 49.0 m2

Curb weight 2 891 kg

Payload 1 669 kg

Total weight 4,560 kg

Maximum speed 277 km / h

Cruise speed 230 km / h

Landing speed 95 km / h

Climbing speed 4.5m / s

Ceiling 4 600 m

Range 1,200 km

Run up 290 m

Run to stop 415 m

Data T-T PZL-30 BII

Span 18.50 m

Length 15.40 m

High 3.50 m

Bearing area 49.0 m2

Curb weight 4 004 kg

Payload 1 146 kg

Total weight 5,150 kg

Maximum speed 345 km / h

Cruise speed 290 km / h

Landing speed 95 km / h

Climbing speed 7.2 m / s

Ceiling 7,400 m

Range 1,200 km

Run up to 200 m

Rn to stop 435 m

Data T-T LWS-6

Span 18.50 m

Length 15.40 m

High 4.00 m

Bearing area 49.5 m2

Curb weight 4 788 kg

Payload 1 582 kg

Total weight 6 370 kg

Maximum speed 341 km / h

Cruising speed 280 km / h

Landing speed 95 km / h

Climbing speed 6.8m / s

Ceiling 6,700 m

Range 1,250 km

Run up 227 m

Run to stop 343 m

Written by Karol Placha Hetman