A standard class single seat sailplane with a wooden structure and largely
plywood covered, the Delfin has a 15 m span (49 ft 2.5 in)
shoulder mounted wing of straight tapered plan and with small
tip fairings or salmons. There is 2° of
dihedral. Forward of the spar the wing is wooden skinned; the first seven aircraft, the
Delfin 1, use ply-foam sandwich but this was replaced with all-wood layers in the production
Delfin 2. Behind the spar the covering is
fabric. The Delfin 1 has metal
ailerons, replaced with all-wood ones in the Delfin 2. No
flaps are fitted but there are
Schempp-Hirth airbrakes mounted at
60% chord. The oval cross-section
fuselage of the Delfin tapers gently to the rear to an integral
fin. All Delfins were built with a fin and
rudder strongly swept on both
leading and
trailing edges and with an
all-moving tailplane, fitted with
servo tabs, mounted on the fuselage. Four Delfin 2s were later modified into
Delfin 3s with a more upright vertical tail and a fin-mounted fixed tailplane with conventional
elevators. The Delfin
cockpit is long, with the pilot seated in a semi-reclining position. On Delfin 1s, it is covered by a long, forward sliding, single piece
canopy reaching almost to the nose but later marks have a shorter, starboard hinged one piece canopy, with the upper nose surface plywood skinned like the rest of the fuselage. The undercarriage consists of a fixed, unsprung, semi-protruding
monowheel and a small tail bumper. A rubber spring nose skid was added to the Delfin 2. The Delfin first flew from
Vrsac in December 1963. The Delfin 2 was produced there, making its first flight on 26 April 1965. The Delfin 3 followed on 29 July 1968. ==Operational history==