The Rubik R-07a Tücsök (Cicada) and R-07b Vöcsök (Grebe) were two versions of a Hungarian primary trainer, differing most obviously in the pilot's seating. First flown in the late 1930s, about 530 were built, some remaining in service into the 1960s.
The first primary glider designed and built by the MSrE (Müegyetemi Sportrepülő Egyesület or in English the Technical University's Sports Flying Group) was the EMESE-B. It was designed to have better performance than existing examples of this class but did not prove popular. One of its designers was Ernő Rubik who used this experience to produce the R-05 Vöcsök, a simpler, lower performance aircraft. Like the EMESE-B it was a typical open frame (uncovered flat girder fuselage) glider with its wing mounted on top of the girder and strut-braced. This prototype proved very successful. Production aircraft were designated R-07 with the name Vöcsök if the pilot's seat was enclosed within a nacelle as it had been on the EMESE-B. R-07s with the seat completely exposed had the name Tücsök. This naming convention was maintained through the R-06 Csóvöcsök, a later, one-off tube (csó) steel fuselage version.[1][2][3]
The R-07 models, whether Vöcsöks or Tücsöks, were all-wood aircraft, with a wing built around two spars and rectangular in plan out to blunted tips. Because the nacelle increased the empty weight of the Vöcsök by 20 kg (44 lb) (22%) it needed a 1.2 m (3 ft 11 in) longer span wing with a 13% greater area than the Tücsök. The forward spar was close to the plywood-covered leading edge and the rest of the wing was fabric-covered. Broad chordailerons filled the outer 40% of the span. The post-war R-07D Vöcsök introduced Frise ailerons. The wing was braced with streamlined steel V-struts to the lower fuselage.[1][3]
A flat, wooden, diagonally-braced girder formed the fuselage of all R-07s, with a deepened, ply-covered forward lower chord, longeron or keel which supported the wing struts, the pilot's seat and controls and, on its underside, a rubber sprung landing skid. On Vöcsöks the keel also supported a ply nacelle which enclosed the pilot, with fabric covering behind it to the first diagonal fuselage member. The nacelle lengthened the Vöcsök by 300 mm (11.8 in). At the rear there was a narrow fin mounting a deep, fabric-covered balanced rudder with a trapezoidal profile. A roughly triangular tailplane was mounted on the top of the fuselage and forward of the rudder post. It was fabric-covered apart from a ply leading edge and carried constant chord elevators separated by a small nick for rudder movement.[1][2][3]
R-07b Vöcsök
Operational historyedit
Despite the large number built (c.530 including all variants), remaining in use from 1938 to the early 60s, little is recorded in English about individual examples or their distribution over Hungarian aeroclubs. A 1981 replica R-07b, HA-2336, remained active until at least 2008.[4]
First prototype, with nacelle. First flown 1 October 1937.
R-06 Csóvöcsök
Steel tube fuselage. First flown in 1939.
R-07a Tücsök
Production model with no seat enclosure. Fin area reduced by cropping to lower longeron; rudder similarly cropped with compensation extension of upper tip. First flown 20 March 1938. 178 built by Aero Ever Kft, Esztergom
R-07b Vöcsök
Production model with nacelle, greater span and length, increasing performance. First flight 1938. About 300 built, mostly by Aero Ever Kft but also including 12 by the Transylvanian Aircraft Plant, Nagyvárad Oradea.
R-07D Vöcsök
1955-6 production batch of 30 examples built by the Experimental Aircraft Plant of the Hungarian Aeronautical Association (MRSz), Dunakesziwith. Fitted with Frise ailerons. In use into early 1960s.
^ abcGabor, Jareb (1988). Magyar vitorlázó repülögépek (in Hungarian). Budapest: Müszaki Könuvkiadó. pp. 83–90.
^Ogden, Bob (2009). Aviation Museums and Collections of Mainland Europe. Air Britain (Historians) Ltd. p. 295. ISBN978 0 85130 418 2.
^Ogden, Bob. Aviation Museums and Collections of Mainland Europe. p. 296.
April 13, 2024
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The Rubik R 07a Tucsok Cicada and R 07b Vocsok Grebe were two versions of a Hungarian primary trainer differing most obviously in the pilot s seating First flown in the late 1930s about 530 were built some remaining in service into the 1960s VocsokR 07b VocsokRole Primary gliderNational origin HungaryManufacturer Aero Ever Kft EsztergomDesigner Erno RubikFirst flight 1 October 1937Number built c 350 Vocsok and 178 Tucsok Contents 1 Design and development 2 Operational history 3 Aircraft on display 4 Variants 5 Specifications R 07 Vocsok 6 ReferencesDesign and development editThe first primary glider designed and built by the MSrE Muegyetemi Sportrepulo Egyesulet or in English the Technical University s Sports Flying Group was the EMESE B It was designed to have better performance than existing examples of this class but did not prove popular One of its designers was Erno Rubik who used this experience to produce the R 05 Vocsok a simpler lower performance aircraft Like the EMESE B it was a typical open frame uncovered flat girder fuselage glider with its wing mounted on top of the girder and strut braced This prototype proved very successful Production aircraft were designated R 07 with the name Vocsok if the pilot s seat was enclosed within a nacelle as it had been on the EMESE B R 07s with the seat completely exposed had the name Tucsok This naming convention was maintained through the R 06 Csovocsok a later one off tube cso steel fuselage version 1 2 3 The R 07 models whether Vocsoks or Tucsoks were all wood aircraft with a wing built around two spars and rectangular in plan out to blunted tips Because the nacelle increased the empty weight of the Vocsok by 20 kg 44 lb 22 it needed a 1 2 m 3 ft 11 in longer span wing with a 13 greater area than the Tucsok The forward spar was close to the plywood covered leading edge and the rest of the wing was fabric covered Broad chord ailerons filled the outer 40 of the span The post war R 07D Vocsok introduced Frise ailerons The wing was braced with streamlined steel V struts to the lower fuselage 1 3 A flat wooden diagonally braced girder formed the fuselage of all R 07s with a deepened ply covered forward lower chord longeron or keel which supported the wing struts the pilot s seat and controls and on its underside a rubber sprung landing skid On Vocsoks the keel also supported a ply nacelle which enclosed the pilot with fabric covering behind it to the first diagonal fuselage member The nacelle lengthened the Vocsok by 300 mm 11 8 in At the rear there was a narrow fin mounting a deep fabric covered balanced rudder with a trapezoidal profile A roughly triangular tailplane was mounted on the top of the fuselage and forward of the rudder post It was fabric covered apart from a ply leading edge and carried constant chord elevators separated by a small nick for rudder movement 1 2 3 nbsp R 07b VocsokOperational history editDespite the large number built c 530 including all variants remaining in use from 1938 to the early 60s little is recorded in English about individual examples or their distribution over Hungarian aeroclubs A 1981 replica R 07b HA 2336 remained active until at least 2008 4 Aircraft on display editR 07b Vocsok HA 2254 Kzlekedesi Muzeum Budapest 5 nbsp nbsp R 07a TucsokVariants editR 05 Vocsok First prototype with nacelle First flown 1 October 1937 R 06 Csovocsok Steel tube fuselage First flown in 1939 R 07a Tucsok Production model with no seat enclosure Fin area reduced by cropping to lower longeron rudder similarly cropped with compensation extension of upper tip First flown 20 March 1938 178 built by Aero Ever Kft Esztergom R 07b Vocsok Production model with nacelle greater span and length increasing performance First flight 1938 About 300 built mostly by Aero Ever Kft but also including 12 by the Transylvanian Aircraft Plant Nagyvarad Oradea R 07D Vocsok 1955 6 production batch of 30 examples built by the Experimental Aircraft Plant of the Hungarian Aeronautical Association MRSz Dunakesziwith Fitted with Frise ailerons In use into early 1960s Specifications R 07 Vocsok editGeneral characteristics Crew One Length 6 3 m 20 ft 8 in Wingspan 11 6 m 38 ft 1 in Wing area 15 0 m2 161 sq ft Aspect ratio 8 97 Airfoil Gottingen Go 533 Empty weight 110 kg 243 lb Gross weight 195 kg 430 lb Performance Maximum speed 110 km h 68 mph 59 kn Stall speed 43 km h 27 mph 23 kn Maximum glide ratio 15 Rate of sink 0 95 m s 187 ft min minimum at 52 km h 32 mph 28 kn References edit a b c Fekes Gabor Vocsok Hungarian gliders 1933 2000 Retrieved 16 February 2019 a b Fekes Gabor Tucsok Hungarian gliders 1933 2000 Retrieved 16 February 2019 a b c Gabor Jareb 1988 Magyar vitorlazo repulogepek in Hungarian Budapest Muszaki Konuvkiado pp 83 90 Ogden Bob 2009 Aviation Museums and Collections of Mainland Europe Air Britain Historians Ltd p 295 ISBN 978 0 85130 418 2 Ogden Bob Aviation Museums and Collections of Mainland Europe p 296 Retrieved from https en wikipedia org w index php title Rubik R 07 Vocsok amp oldid 1119474765, wikipedia, wiki, book, books, library,
