The ICA-Brasov or Intreprinderea de Constructii Aeronautice Brasov (Aircraft Construction Factory Brasov) is responsible for all sailplane development and production in Romania, and their principal designer is Professor losif Silimon, who has created a long series of sailplanes that are widely used in the national clubs; these are prefixed by the letters 'IS' which form the Professor's initials.
Among the earliest of these was the IS-3D training or Standard Class single-seater, the prototype of which, the IS-3 Traian Vuia, was built in 1956.
This design has a pointed top to the fin and rudder and is fitted with a drogue parachute for deployment in short-field landings. It is of conventional wooden construction with plywood and fabric covering, the single-spar high cantilever wings being plywood-covered from the leading edge to the spar and fabric covered aft of the spar to the trailing edge; there are air brakes in the wing upper and lower surfaces and wing tip 'salmon' fairings are fitted. The all-wood fuselage is of oval cross-section and the fin and tailplane are plywood covered, the elevators and rudder being fabric covered; there is a Flettner-type trim tab in the starboard elevator. The landing gear consists of a fixed monowheel forward of the eg with a pneumatic tyre and mechanical brake, and a short nose skid and tailskid. The pilot sits under a large sideways hinging cockpit canopy.
The IS-3D continued in production at Brasov until the early 1970s, being widely used in the Romanian clubs.
Span: 50 ft 3.5 in
Length: 23 ft 9.5 in
Height: 5 ft 3 in
Wing area: 164.6 sqft
Aspect ratio: 15.30
Empty weight: 485 lb
Max weight: 754 lb
Max speed: 150 mph
Max aero-tow speed: 75 mph
Min sinking speed: 2.23 ft/sec at 40 mph
Best glide ratio: 28:1 at 46 mph