Type designation: "lamináris" R-22S
Name: "lamináris" Június-18
Designer: Márton PAPP, György MEZŐ, Imre TAKÁCS
Class: High performance
General arrangement: Cantilever mid-wing, closed cockpit with bubble canopy, fixed wheel, traditional tail unit
Crew: 1
First flight: 1953
Manufacturer: Sportárutermelő V., Esztergom (former AeroEver Ltd.)
Number of built: 1

Short history:
This all-wooden, mid-wing, cantilever, single-seat, high performance glider was a special version of the R-22S Június-18. It was called as "lamináris" R-22S (R-22S with laminar wing). Only one example had been built in 1952 and it was modified in 1954 and in 1960. It was certified for cloud flying.
The most memorable flight flown with R-22S "lamináris" Június 18 was a 400.4 km goal distance flight by Tibor Bogdándi in 1961, which was a new Hungarian record.

Structure:  All wooden
The whole surface of the single spar wing was covered with plywood. The NACA 63(2)-615 airfoils were used. Torsion loads were passed to the fuselage instead of secondary spars by trihedral steel-tube structures fastened to the rear surface of the main spar at wing roots. The plain type ailerons were fabric covered. The leading edge of the wing was straight unlike to R-22S, and the span as well as the area of the ailerons were smaller that of the original R-22S. No flaps were fitted. The Göppingen type airbrakes worked on both surfaces of the wing. The 1952 year version had rounded wingtips, however the 1954 year version got "almond" wingtip fairings. In 1960 the span was reduced to meet the Standard Class requirements and the wingtip fairings were abandoned.
The 1952 and 1954 versions had the same fuselage than that of the original R-22S. However in 1960 the fuselage of the R-22SV C-Futár was adopted.
   Tail unit:
The 1952 and 1954 versions had the same tail unit than that of the original R-22S. However in 1960 the tail unit of the R-22SV C-Futár was adopted.

Larger picture

     Span, m: 16
     Area, m2: 12.8
     Aspect ratio: 20
     Chord (root), m: 1.15
     Chord (tip), m: 0.45
     Airfoil (root), m: NACA 63(2)-615
     Airfoil (mid-span), m: NACA 63(2)-615
     Airfoil (tip), m: NACA 63(2)-615
     Dihedral, degree: 2
     Sweep, degree: -1.25
     Washout: Geometric, -1.5 degrees
     Span, m: 3.25
     Mean chord, m: 0.22
     Total area, m2: 1.43
     Balancing: None
     Type: Göppingen
     Position (upside/downside): u/d
     Total area, m2: 0.45
     Position, % of chord: 0.48
   Horizontal stabilizer:
     Span, m: 2.7
     Area, m2: 1.97
     Span, m: 2.7
     Area, m2: 1,11
     Airfoil: NACA 0009
     Balancing: None
     Trim: Tab
   Vertical stabilizer and rudder:
     Total area, m2: 1.56
     Rudder area, m2: 0.896
     Balancing: None
     Length, m: 6.5
     Width, m: 0.62
     Height: 0.97
     Cross section, m2: 0.52
   Landing gear:
     Type: Fixed
     Wheel diameter, m: 0.26
   Wing, kg: 132
   Fuselage, kg: 62
   Tail unit, kg: 9
   Empty glider, kg: 240
   Gross, kg: 360
   Ballast, kg: None
   Wing loading, kg/m2: 26.6
   VNE, km/h: 180
   Max. speed with open airbrakes, km/h: 180
   Max. aerotow speed, km/h: 120
   Max. winch speed, km/h: 105
   Max. speed in rough air, km/h: 160
   Stall speed, km/h: 65
   Min. sink, m/s (at gliding speed, km/h): ?/68
   Best L/D (at gliding speed, km/h): 28/75
Start methods: Winch, Aerotow

Origin of data and 3-view drawing:
Jereb Gábor: Magyar vitorlázó repülőgépek, Műszaki Könyvkiadó, 1988, Budapest
(Gábor JEREB: Hungarian Gliders, Technical Publishing House, 1988, Budapest)

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