Lublin R-X was
the Polish liaison aircraft, built in 1929 in the Plage i Laśkiewicz factory in
, the Polish War Ministry
opened a contest for a military liaison and observation plane. It
was meant to operate from casual airfields, used by Army land
units. The private factory Plage i Laśkiewicz in Lublin proposed
the Lublin R-X
, designed in 1928 by Jerzy Rudlicki
. The first prototype was flown
on February 1, 1929. Although its mass was bigger, and the
performance was lower, than expected, the plane appeared quite
successful and five pre-series aircraft were built in 1929,
. The R-Xa were fitted with an
armament - a machine gun in a rear cab.
After evaluation by the Polish Air Force, the R-Xa won the contest
for a liaison plane in December 1929, over PWS-5t2
and PZL Ł.2
having the shortest take-off and landing, good handling at low
speed and satisfactory performance, but the factory was ordered to
develop design further. The result was a new design Lublin R-XIII
, basing upon the R-X
construction and mass-produced.
The seventh R-X was built in 1929 as a long-distance sports plane.
It had fuel tanks 800 l and a range of 2500 km. In 1932 it was
modified with an addition of the Townend ring onto the engine,
wheels' covers and metal propeller, and designated the R-Xa
. The R-Xs had factory numbers 52-1 to 52-7.
Mixed construction (steel and wood) braced high-wing (parasol)
, conventional in layout. A
fuselage of a steel frame, canvas-covered (engine part was
duralumin-covered). Rectangular wings with elliptical ends,
two-spar, of wooden construction, canvas and plywood covered. Wings
could be dismounted. Crew of two, sitting in tandem
in open cockpit
, with twin controls. Conventional
fixed landing gear
, with a rear skid.
The observer had a 7.7 mm machine gun on a ring mounting. A 9
cylinder air-cooled radial engine
Wright Whirlwind J-5Ab
(produced in Poland by Polish Skoda
Works) with 162 kW (220 hp) nominal power and 176 kW (240
hp) take-off power. Two-blade wooden or metal propeller
, 2.7 m diameter. Fuel tank 250 liters in
the fuselage, could be dropped in case of fire emergency (normal
fuel capacity was 200 l).
The pre-series R-Xa were used by the Polish Air Force since 1929.
In 1931 three aircraft were modified as liaison staff machines, by
removing a machine gun ring from a rear cab and fitting it with a
The R-Xa bis was used for several long-distance flights. It carried
a registration SP-ABW and was named "Srebrny Ptak" (Silver
). On August 25, 1929 it flew from Poznań to Barcelona (1800 km non stop). In September 23 -
October 7, 1931 Stanisław Karpiński flew it around the Europe
(6450 km Warsaw - Bucharest - Stambul - Rome - Torino - London -
2 - October 24, 1932 Stanisław Karpiński flew the R-Xa bis from
Warsaw through Stambul, Bagdad, Teheran, Kabul, Cairo to
Warsaw (14,390 km in 108 h 50').
The plane was scrapped
- Andrzej Glass: "Polskie konstrukcje lotnicze 1893-1939"
(Polish aviation constructions 1893-1939), WKiŁ, Warsaw
1977 ( , no ISBN)