Type designation: "vizes" R-22S (R-22S with water ballast)
Name: "vizes" Június-18
Designer: PAPP, M. - MEZŐ, Gy. - TAKÁCS, I.
Class: High performance
General arrangement: Cantilever mid-wing, closed cockpit with bubble canopy, fixed wheel, traditional, later V tail unit
Crew: 1
First flight: May 21, 1954
Manufacturer: Sportárutermelő V., Esztergom (former AeroEver Ltd.)
Number of built: 1

Short history:
A special version of the R-22S Június-18 was the "vizes" R-22S (R-22S with water ballast), which had been built in 1954 for the international competition held in Leszno, Poland at the same year. György Mező got the overall second position there with this glider. He gained new Hungarian records as well with this glider in 1954: speed over 100 km triangle course (69.1 km/h), distance over out-and-return course (267 km). Only one example was built. The glider was not certified for aerobatics.
This was the first Hungarian glider with water ballast. The total capacity of the tanks was 60 l.
According to the performance measurements conducted in flight by the Technical University of Budapest, the performance of the glider was improved by the modifications particularly at higher speeds.

Structure:  All wooden
This version got a new wing without flaps and without fittings for folding. Smaller ailerons and Göppingen airbrakes were fitted. The airfoil of the wing was not changed, however the whole wing was covered by two layers of plywood applied diagonally. On the plywood cork filings were laid on with glue and later the surface was polished. A pair of ballast tanks were built into both wings.
In 1955 the glider was modified: wing tip "salmon" fairings were fitted.
The fusalege was also changed. It got a straight upper contour line behind the wing and a small, short vertical surface in front of the vertical stabilizer were fitted to improve lateral stability. One central water ballast tanks was built into the fuselage.
   Tail unit:
The tail unit was also modified: cantilever horizontal stabilizer was fitted to lessen drag.
In 1957 the tail unit was changed to a V tail. The new tail unit was connected to the fuselage by pins.

Larger picture

     Span, m: 15.8
     Area, m2: 13.5
     Aspect ratio: 18.55
     Chord (root), m: 1.17
     Chord (tip), m: 0.45
     Airfoil (root), m: Gö 549 mod.
     Airfoil (mid-span), m: Gö 549
     Airfoil (tip), m: W-192
     Dihedral, degree: 2
     Sweep, degree: -1
     Washout: Aerodynamic and -2 degrees geometric
     Span, m: 2.86
     Mean chord, m: 0.3
     Total area, m2: 1.2
     Balancing: None
     Type: Göppingen
     Position (upside/downside): u/d
     Total area, m2: 0.46
     Position, % of chord: 0.42
   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: 6.8
     Width, m: 0.62
     Height: 0.97
     Cross section, m2: 0.52
   Landing gear:
     Type: Fixed
     Wheel diameter, m: 0.26
   Wing, kg: ?
   Fuselage, kg: ?
   Tail unit, kg: ?
   Empty glider, kg: 261
   Gross, kg: 371/431
   Ballast, kg: 60
   Wing loading, kg/m2: 27.5/32.0
   VNE, km/h: 180
   Max. speed with open airbrakes, km/h: 180
   Max. aerotow speed, km/h: 110
   Max. winch speed, km/h: 90
   Max. speed in rough air, km/h: 140
   Stall speed, km/h: 67
   Min. sink, m/s (at gliding speed, km/h): 0.73/68
   Best L/D (at gliding speed, km/h): 29.6/79
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)

Gábor FEKECS E-mail: