Lublin R-XI

Infobox Aircraft
name=Lublin R-XI


caption=
type= Passenger plane
manufacturer=Plage i Laśkiewicz
national origin= Poland
designer=
first flight= 8 February 1930
introduced=
retired=
status=prototype
primary user=
more users=
produced=
number built = 1
unit cost=
variants with their own articles=The Lublin R-XI was the Polish passenger plane for 4 passengers, designed in 1930 in the Plage i Laśkiewicz factory in Lublin, that remained a prototype.

Development

The aircraft was developed for a contest for a successor of Junkers F-13 as a light passenger and mail plane in LOT Polish Airlines, announced by the Ministry of Communication. The design was partly modeled on a construction of Fokker F.VII, produced under license by Plage i Laśkiewicz, especially in a wing design. The main designer was Jerzy Rudlicki. The prototype was first flown on 8 February 1930 in Lublin (registration: SP-ACC). From June 1930 it was evaluated by the LOT Airlines. The prototype was damaged during take-off in July 1931, and was not repaired.

The aircraft was not successful, because its weight appeared 250 kg more, than designed, it also had worse speed, range and ceiling, than expected (its competitor, the PWS-21, was not successful either). Its improved development became Lublin R-XVI, built in a small series, although not as a passenger plane.

Description

The R-XI was a mixed construction cantilever high-wing monoplane, single engine, conventional in layout. It had a steel framed, canvas covered fuselage (engine part covered with duralumin) and a single-piece, plywood covered, three-spar elliptical wing of wooden construction. The empennage was of steel construction, canvas covered. It had a conventional fixed landing gear, with a rear skid, base 2.7 m. The main gear was joined with a wing by struts. The closed cabin had a capacity of six: a pilot, a mechanic and 4 passengers. Two crewmen had twin controls and individual doors on either side, the fifth passenger could be carried instead of the mechanic. The passenger cabin had height 1.5 m and width 1.3 m and two triangular doors on the left side. Behind it there was a place for a baggage.

Single engine in front: 9-cylinder air-cooled Polish Skoda Works Wright Whirlwind J-5 radial engine delivering 240 hp (179 kW) take-off power and 220 hp (164 kW) nominal power, with a NACA cowling, driving a two-blade metal propeller of a fixed pitch. A 300 litre fuel tank was fitted in wing and 150 litre under the cab (normal capacity was 200 l). The cruise fuel consumption was 40-50 l/h.

pecifications

aircraft specifications
plane or copter?=plane
jet or prop?=prop
ref=Glass, A. (1977)
crew=2, pilot and mechanic
capacity=4 passengers (maximum 5 with a crew of one)
payload main=
payload alt=
length main= 9.6 m
length alt= 31 ft 5⅞ in
span main= 15 m
span alt= 49 ft 2⅜ in
height main= 2.9 m
height alt= 9 ft 6 in
area main= 30 m²
area alt= 323 ft²
airfoil=
empty weight main= 1,210 kg
empty weight alt= 2,662 lb
loaded weight main= 1,943 kg
loaded weight alt= 4,275 lb
useful load main= 733 kg
useful load alt= 1,613 lb
max takeoff weight main=
max takeoff weight alt=
more general=
engine (prop)= Skoda Wright Whirlwind J-5
type of prop=9-cylinder radial engine
number of props=1
power main= 240 hp
power alt= 180 kW
power original=
max speed main=185 km/h
max speed alt= 100 knots, 115 mph
cruise speed main= 168 km/h
cruise speed alt= 91 knots, 104 mph
stall speed main=90 km/h
stall speed alt= 49 knots, 56 mph
never exceed speed main=
never exceed speed alt=
range main= 730 km
range alt= 394 NM, 453 mi
ceiling main= 2,800 m
ceiling alt= 9,200 ft
climb rate main= 1.8 m/s
climb rate alt= 354 ft/min
loading main= 65 kg/m²
loading alt=13 lb/ft²
thrust/weight=
power/mass main=
power/mass alt=
more performance=

ee also

aircontent
related=
*Lublin R-XII - Lublin R-XVI

similar aircraft=
*PWS-21 - Fokker F.VIIa/1m

lists=

see also=

References

*Andrzej Glass: "Polskie konstrukcje lotnicze 1893-1939" ("Polish aviation constructions 1893-1939"), WKiŁ, Warsaw 1977, p. 147-149 pl icon

External links

* [http://www.airwar.ru/enc/cw1/lublinr11.html Photos and drawings] at Ugolok Neba page