Type designation: R-08c
Name: C-Pilis
Designer: Ernő RUBIK
Class: Training
General arrangement: High, strutted wing, open canopy, traditional tail unit
Crew: 1
First flight: 1939
Manufacturer: Aero Ever Kft., Esztergom
Number of built: 70

Short history:
One example of Wolf Hirth's Wolf had arrived to Hungary in 1937 and became very popular among glider pilots. Ernő Rubik designed a new glider, the Pilis, to meet the demand for such kind of gliders. The new design was based on the line of Szittya gliders but with reduced dimensions. The first version, which later got the type designation of R-08a, had first flown on March 19, 1939. New versions followed and this type was one of the gliders built in greatest number in Hungary.

With this version of the Pilis family the R-08b's gull form wing was eliminated and a slightly lighter structure was developed. The first example of this version flew in 1939 and altogether 70 examples were built.

The R-08c was authorized for bungee-cord, aerotow and winch launching, cloud flying and basic aerobatics.

Structure:  All wooden
The one spar, streamlined steel tube strutted wing had a plywood covered torsion resistant box structure in front of the main spar. The ribs had flat lattice frame structures. No airbrakes were fitted on these version.
The fuselage was a semi-monocoque structure strengthened with ribs and longerons. The glider got removable open canopies fitted with simple windshield. The landing gear consisted of a main and a small aft skid both rubber dumped.
   Tail unit:
The tail unit had traditional arrangement and a structure similar to the wing.

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     Span, m: 13,6
     Area, m2: 15,7
     Aspect ratio: 11,78
     Chord (root), m: 1,2
     Chord (tip), m: 0,75
     Airfoil (root), m: Gö 533
     Airfoil (mid-span), m: W-339
     Airfoil (tip), m: W-229
     Dihedral, degree: 1,5
     Sweep, degree: 0
     Washout: Aerodynamic and -3° geometric
     Span, m: 3,75
     Mean chord, m: 0,264
     Total area, m2: 2,82
     Balancing: None
   Horizontal stabilizer:
     Span, m: 3
     Area, m2: 2,26
     Span, m: 3
     Area, m2: 1,54
     Airfoil: Symmetric
     Balancing: None
     Trim: Yes
   Vertical stabilizer and rudder:
     Total area, m2: 1,18
     Rudder area, m2: 0,93
     Balancing: Aerodynamic
     Length, m: 6,74
     Width, m: ?
     Height: ?
     Cross section, m2: ?
   Landing gear:
     Type: Skid
   Wing, kg: ?
   Fuselage, kg: ?
   Tail unit, kg: ?
   Empty glider, kg: 145
   Gross, kg: 245
   Ballast, kg: None
   Wing loading, kg/m2: 15,6
   VNE, km/h: 160
   Max. aerotow speed, km/h: 100
   Max. winch speed, km/h: 70
   Max. speed in rough air, km/h: ?
   Stall speed, km/h: ?
   Min. sink, m/s (at gliding speed, km/h): 0,95/?
   Best L/D (at gliding speed, km/h): 17/?
Start methods: Bungee, 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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