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In the mid-1950s the Philippine Institute of Science and Technology (I.S.T.) designed aircraft to explore the possibilities of local aircraft production from indigenous materials. The single engine, tricycle undercarriage, low wing monoplane L-17 was one of them.
Designed by Antonio J. de Leon, its wing was a single-piece wooden structure with 5° of dihedral and a straight-tapered plan. It was plywood-covered and had split flaps inboard of the ailerons. The cantilever tail unit was similarly constructed with the straight-tapered horizontal surfaces on top of the extreme aft fuselage; the single-piece elevator carried an offset trim tab. The vertical tail was tall and straight-edged; the bottom of the horn balanced rudder was above the elevator and just aft of its hinge, with a small cut-out to allow for elevator deflection.
The L-17's fuselage was a plywood-skinned wooden semi-monocoque, the cockpit seating two side by side under a single piece canopy. A 108 hp (80 kW) Lycoming O-235 flat-four engine drove a two-blade propeller. The fixed tricycle undercarriage had rearward-sloping oleo legs mounted to the wings, giving a track of 2.40 m (7 ft 10 in).
The first flight of the L-17 was scheduled for May 1956.
Engine: 1 × Lycoming O-235-C1, 81 kW (108 hp)
Propeller: 2-bladed , fixed pitch, wooden
Wingspan: 9.60 m (31 ft 6 in)
Wing area: 13.40 m2 (144.2 sq ft)
Airfoil: US 35B at root, NACA 23012 tip
Length: 7.20 m (23 ft 7 in)
Height: 3.20 m (10 ft 6 in)
Empty weight: 510 kg (1,124 lb)
Gross weight: 735 kg (1,620 lb)
Fuel capacity: 68 L (15 Imp gal, 18 US gal)
Maximum speed: 210 km/h (130 mph, 110 kn)
Cruise speed: 175 km/h (109 mph, 94 kn)
Stall: 80 kph
Rate of climb: 3.8 m/s (750 ft/min)
Crew: 2

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