RWD-14 Czapla
{{Infobox aircraft
|name =RWD-14b Czapla
|image =RWD 14b Czapla.jpg
|caption =
|type =reconnaissance and liaison aircraft
|designer =
|first_flight =1936
|introduction =1939
|retired =
|status =
|primary_user =Polish Air Force
|more_users = Romanian Air Force
|produced =1938–1939
|number_built =65 (+4 prototypes)
|unit cost =
|variants =
}}
The RWD-14 Czapla (LWS Czapla) was a Polish army cooperation aircraft (observation, close reconnaissance and liaison aircraft), designed in the mid-1930s by the RWD team, and produced in the LWS factory from 1938. A series of 65 aircraft were built and most were used by the Polish Air Force observation squadrons during World War II in 1939.
Design and development
The aircraft was designed in response to a Polish Air Force requirement of 1933 for a new army cooperation plane, a successor of the Lublin R-XIII. The RWD team of the DWL workshops (Doświadczalne Warsztaty Lotnicze) initially proposed the RWD-12 project, based on the RWD-8 trainer. It was however considered as not as good as the R-XIII, and was not built. Another aircraft, the RWD-14 was designed by Stanislaw Rogalski and Jerzy Drzewiecki instead.Glass A. (1977), pp. 318–320 Designer Tadeusz Chyliński prepared its technical documentation.Andrzej Glass (2003). Słownik biograficzny techników polskich, SBTP: Warsaw, p. 24)
The first prototype was flown in early 1936 (according to newest research, earlier given date December 1935 is wrong).Mazur W. (2014), p.12 It won the contest over the Lublin R-XXI project and the PWS factory project, but factory trials showed that its performance was still not satisfactory. In 1937 two modified prototypes were built, designated RWD-14a, but both crashed during trials that year due to steering mechanism faults (the pilots survived). Finally, in early 1938 the fourth improved prototype, designated RWD-14b, was built. After successful trials it was ordered by the Polish Air Force, receiving the name Czapla (Polish: heron), but due to a long development process, it was regarded as only an interim model, to replace the R-XIII until the advent of the more modern LWS-3 Mewa. In return for refunding the development costs, the DWL gave the rights to produce the RWD-14b to the state factory LWS (Lubelska Wytwórnia Samolotów – Lublin Aircraft Works, a successor of the Plage i Laśkiewicz).
The LWS built a series of 65 RWD-14b Czapla by February 1939. They were also known under a military designation LWS Czapla.
Operational history
The Czapla entered service in the Polish Air Force in the spring of 1939, equipping some observation squadrons (eskadra obserwacyjna). Due to its long development, it was not a modern aircraft, only a little better than the Lublin R-XIII. Its advantage was its short take-off (140 m) and landing (120 m), enabling it to operate from fields and meadows. Its modern successor, the LWS-3 Mewa, did not manage to enter operational units due to the war.Morgała. A (2003), pp. 210
By the invasion of Poland in 1939, the Polish Air Force had 35 Czaplas in five observation squadrons (out of twelve): No.'s 13, 23, 33, 53 and 63, each with seven aircraft. Squadrons were distributed among the field Armies. The remaining 30 Czaplas were initially in reserve. Several were used to supplement the combat units during the campaign (the mentioned squadrons and several others). In total, 49 Czaplas were used in units.Morgała. A (2003), pp. 201–205 Like the R-XIII, the Czapla was no match for any Luftwaffe fighter, bomber, or even reconnaissance aircraft, being much slower, and armed with only two machine guns. In spite of this, they were actively used for close reconnaissance and liaison tasks.
Most – 35 RWD-14b were destroyed during the campaign. At least 14 were withdrawn to Romania (the sources quote numbers from 14 to 17). They were taken over by the Romanian Air Force and used for training and auxiliary duties. Several aircraft were captured in Poland by the Germans or the Soviets, but were not used by them. No RWD-14b has survived.
Technical description
Mixed construction braced parasol high-wing monoplane, conventional in layout. A fuselage of a metal and wooden frame, covered with canvas. Wooden two-spar wings, canvas- and plywood-covered, fitted with slats. Wings were folding rearwards (width with folded wings: 3.9 m). Stabilizers of wooden construction. Conventional fixed landing gear, with a rear wheel. Crew of two, sitting in tandem in open cockpits, with twin controls and individual windshields. The observer had a 7.7 mm Vickers K machine gun, the pilot had a fixed 7.92 mm wz.33 machine gun with an interrupter gear. 9-cylinder air-cooled radial engine PZL G-1620B Mors-II with 430 hp (320 kW) nominal power and 470 hp (350 kW) take-off power. Two-blade wooden propeller. A fuel tank with a capacity of 315 litres in the fuselage, dropped in emergency. The aircraft could be fitted with radio N2L/T and camera.
Operators
Specifications (RWD-14b)
{{Aircraft specs
|prime units?=met
|crew=2
|capacity= {{cvt|475|kg|01}} useful load
|length m=9
|length note=
|span m=11.9
|span note=
|height m=3
|height note=
|wing area sqm=22
|wing area note=
|aspect ratio=
|airfoil=
|empty weight kg=1225
|empty weight note=
|gross weight kg=1700
|gross weight note=
|max takeoff weight kg=
|max takeoff weight note=
|fuel capacity=
|more general=
|eng1 number=1
|eng1 name=PZL G-1620B Mors-II
|eng1 type=9-cylinder air-cooled radial piston engine
|eng1 kw=
|eng1 hp=470
|eng1 note=at 2,375 rpm for take-off
::::{{cvt|430|hp|0}} at 2,150 rpm at sea level
|prop blade number=2
|prop name=Szomański fixed-pitch propeller
|prop dia m=
|prop dia note=
|max speed kmh=247
|max speed note=
|cruise speed kmh=232
|cruise speed note=
|stall speed kmh=80
|stall speed note=ca
|never exceed speed kmh=
|never exceed speed note=
|range km=675
|range note=
|combat range km=
|combat range note=
|ferry range km=
|ferry range note=
|endurance=
|ceiling m=5100
|ceiling note=
|g limits=
|roll rate=
|climb rate ms=6.1
|climb rate note=
|time to altitude=
|wing loading kg/m2=77
|wing loading note=
|fuel consumption kg/km=
|power/mass=
|more performance=
|armament=
- 1 × fixed, forward-firing 7.92 mm wz.33 machine gun
- 1 × flexible, rearward-firing 7.7 mm Vickers K machine gun for observer
|guns=
|bombs=
|rockets=
|avionics=
}}
See also
{{aircontent|
|related=
|similar aircraft=
|lists=
|see also=
}}
References
{{commons category|RWD 14}}
- Andrzej Glass (1977): "Polskie konstrukcje lotnicze 1893–1939" (Polish aviation constructions 1893–1939), WKiŁ, Warsaw {{in lang|pl}}
- Andrzej Morgała (2003): "Samoloty wojskowe w Polsce 1924–1939" (Military aircraft in Poland 1924–1939), Bellona, Warsaw, {{ISBN|83-11-09319-9}} {{in lang|pl}}
- Wojciech Mazur (2014): "Samoloty RWD.14 i LWS.3", series Wielki Leksykon Uzbrojenia Wrzesień 1939 no.39, Edipresse, Warsaw, {{ISBN|978-83-7769-587-6}} {{in lang|pl}}
{{RWD aircraft}}
{{LWS aircraft}}
Category:1930s Polish military utility aircraft
Category:1930s Polish military reconnaissance aircraft
Category:Parasol-wing aircraft
Category:Aircraft first flown in 1936
Category:Single-engined tractor aircraft