The L-29 DELFIN two-seat jet aircraft made by Aero Vodochody was designed by Z. Rublič and K. Tomáš. The first production aircraft was delivered in April 1963. The aircraft, which is intended for both initial and advanced training, has a robust air-frame; it can operate from rough grassy, sandy and muddy fields. It is designed so as to facilitate the pilots´ transfer to combat aircraft. Being of a totally new design, a tandem seating position was chosen with the best wing for subsonic flight, the straight wing. The wing has the ability to carry 150 lts drop tanks. The maximum speed with underwing stores is 0.7 mach and 0.75 without, while G limits being +8 -4 all this in an aircraft weighing just over 3,500 KGs. The mid-wing all-metal aircraft is powered by M-701 jet engine with a radial-flow compressor and a single-stage turbine made by Motorlet with the maximum thrust of 8,72 kN. The fuselage has a single engine with an air intake in each wing root. This is mounted about mid way and towards the rear of the wing. The Motorlet M-701c-500 turbojet rated is at 1,960 lbs. thrust. The M-701 is an early generation jet engine and features a single stage centrifugal compressor driven by a single stage axial flow turbine. 100% RPM is 15,300, this gives a whistling sound a bit like the fouger magister of similar vintage. There are 7 combustion chambers mounted around the engine. The semi-monocoque structure of the air-frame is divided into three compartments which are screwed together. The first compartment is the nose with the aerial, the second is a pressurized cockpit, and the third part of the fuselage contains the engine. The wing is a self-supporting one-sparred all-metal structure. On wingtips are pylons for auxiliary fuel tanks or optional missiles. The aircraft has a retractable three-wheel landing gear. The pupil and the instructor are seated one after the other in synchronised ejection seats. The aircraft was produced in Aero Vodochody and Let Kunovice from 1962 to 1973. Over 3500 were built. Specifications: Max. speed at 5,000m-655 km/h; at sea level-650 km/h; Max. ferry range-1600 km; Service ceiling-11 000 m; Max. climb (full load)-14 m/s; Endurance-2 h; Engine-M-701 Motorlet; Thrust-8,72 kN; Max. takeoff weight-3586 kg; Empty weight-2280 kg; Wingspan (including fuel tanks)-10,29 m; Length-10,81 m; Height-3,13 m; Wing area-19,8 m2.