Lublin R-XI
| {{Infobox aircraft begin
|name=Lublin R-XI |image=Lublin R-XI.jpg |caption= }}{{Infobox aircraft type |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.
Specifications
{{Aircraft specs
|ref=Jane's all the World's Aircraft 1931,{{cite book |title=Jane's all the World's Aircraft 1931 |editor1-last=Grey |editor1-first=C.G. |year=1931 |publisher=Sampson Low, Marston & company, ltd |location=London |pages=218c–219c}} Polish Aircraft 1893–1939,{{cite book|title=Polish Aircraft 1893–1939|last=Cynk|first=Jerzy|year=1971|publisher=Putnam Publishing|location=London|isbn=0-370-00085-4|pages=[https://archive.org/details/polishaircraft1800cynk/page/286 286–291]|url-access=registration|url=https://archive.org/details/polishaircraft1800cynk/page/286}} Polskie konstrukcje lotnicze 1893-1939{{cite book |last1=Glass |first1=Andrzej |title=Polskie konstrukcje lotnicze 1893-1939 (Polish aviation constructions 1893-1939) |date=1977 |language=Polish |publisher=WKiŁ |location=Warsaw |pages=147–149}}
|prime units?=met
|crew=1-2
|capacity=4-5 pax / {{cvt|733|kg}} payload
|length m=9.8
|span m=15
|height m=2.4
|wing area sqm=30
|aspect ratio=7
|airfoil=
|empty weight kg=1033
|gross weight kg=1943
|max takeoff weight kg=
|fuel capacity=
|more general=
|eng1 number=1
|eng1 name=Polish-Skoda J-5 Whirlwind
|eng1 type=9-cylinder air-cooled radial piston engine
|eng1 hp=230
|prop blade number=2
|prop name=Standard Steel fixed-pitch metal propeller
|prop dia m=
|prop dia ft=
|prop dia in=
|prop dia note=
|max speed kmh=210
|max speed note=at sea level
|cruise speed kmh=168
|cruise speed note=
- Landing speed: {{cvt|85|-|90|km/h|mph kn}}
|stall speed kmh=90
|never exceed speed kmh=
|minimum control speed kmh=
|range km=730
|combat range km=
|ferry range km=900
|endurance=6 hours with wing tanks; 3 hours 30 minutes with jettisonable fuselage tank only
|ceiling m=6000
|g limits=
|roll rate=
|climb rate ms=1.8
|time to altitude={{cvt|4000|m}} in 22 minutes
|wing loading kg/m2=65
|fuel consumption kg/km=
|power/mass={{cvt|0.05155|hp/lb|kW/kg}}
|more performance=
}}
See also
References
{{Reflist}}
External links
{{commons category|Lublin R-XI}}
- [http://www.airwar.ru/enc/cw1/lublinr11.html Photos and drawings] at Ugolok Neba page
{{Lublin aircraft}}
Category:1930s Polish airliners
Category:Single-engined tractor aircraft