WesWorld

The State Aircraft Factory has developed this design to replace the Royal Yugoslav Air Force's current Miles Master advanced trainers. Testing of a prototype has begun.

Technical Description

Low wing cantilever monoplane. Wing section NACA Symmetrical 18% at root, tapering to NACA Symmetrical 9% at tips. Wide centre-section, two outer sections and interchangeable square wing tips. All-metal structure with flush riveted stressed skin covering. Ailerons on three-quarters of span of outer wing sections. Slotted flaps with hydraulic operation between ailerons and fuselage. Ailerons and flaps have metal frames and fabric covering.

Oval all-metal fuselage of composite construction. Forward section including cockpits of welded steel tubing covered with detachable metal panels. Rear section is a semi-monocoque with flush riveted stressed-skin covering.

Cantilever monoplane-type tail unit. All metal structure with metal covered fixed surfaces and fabric-covered movable surfaces. Trimming tabs in elevators and rudder.

Retractable cantilever-type undercarriage, with wheels folding rearward. Retraction by engine-driven hydraulic pump. Hydraulic wheel brakes. Fully swiveling tail wheel.

One Pratt and Whitney R-1340 AN-1 Wasp radial air-cooled engine. Two-bladed constant speed airscrew. Fuel tanks (420 litres) in centre section. Oil tank (31 litres) in engine compartment.

Tandem cockpits with individually operating sliding enclosures. Complete dual flight and engine controls in each cockpit.

Provision for one M32 machinegun with 220 rounds of ammunition in starboard side of fuselage, or one M32 machinegun with 220 rounds of ammunition per gun in each outer wing section. Provision for two 20 kg bombs to be carried under outer wing sections.

Wing span 11.0 metres; wing area 18 sq. metres; Length 8.77 metres; Height 3.69 metres. Empty weight 2,020 kg; loaded weight 2,564 kg.

Maximum speed 333 kph, maximum cruise speed 296 kph. Ceiling 5,070 metres. Range 606 km.


My thanks to Marek for permission to use his drawing.

Looks very good. I like the idea of the improvised armament.
A small issue could be those wheels from the main landing gear. They appear to be very small (not much bigger than the tailwheel). I don't know if that's a big problem but it could affect the handling on the ground and may lead to accidents. That would not be a feature one would want for a trainer...