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Lublin R-X
The Lublin R-X was a Polish liaison aircraft, built in 1929 in the Plage i Laśkiewicz factory in Lublin. ==Development== In 1927, 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, designated R-Xa. 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 bis. The R-Xs had factory numbers 52-1 to 52-7.
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