t9 stiletto1 t9 stiletto2 t9 stiletto3 t9 stiletto4 t9 stiletto5 t9 stiletto6 t9 stiletto7


The design of this aircraft wed two main characteristic usually in contrast: an advanced aerodynamics with a simple, classically constructed airframe conceived as an assembly of small components.
The first characteristic, combined with the lightness of the aircraft, allows excellent flight performance with low power and as a consequence with low fuel consumption.
The second one allows the maintenance and production process to be optimized by using small organizations scattered around the world to service a niche market with a broadly international clientele.
The T9 aerodinamic design represents the state of the art in respect to the speed flight envelope of this type of plane. The aerodynamic efficiency is shown in particular in the "tadpole" shape of the fuselage, in the adoption of Wortmann profiles, in the high aspect ratio of the horizontal surfaces and in the adoption of a horizontal, one piece, all-moving tailplane.
The STILETTO combine this advanced aerodinamics with an original architecture for the structure.
The fuselage consists of two parts: a crash resistent steel tube framework where the crew is, and a demountable tailboom carrying the empennages.
The aircraft systems are principally located in the framework area which is covered with removable panels of composite material.
For a training and club aircraft, i.e. an aircraft intensely used by a number of different pilots with different flying experience, maintenance-related costs play a predominant role.
This design approach ensures total and ready accessibility to the systems for inspection, maintenance and repair, thus calling for less time.
Demountability also facilitates storage and shipping operation.
About production process, although the T9 is designed to be produced on an industriai scale, it essentially remains, as all aircraft of this class, a hand-made product with the result that its final cost is an important function of labour charges.
Starting from such an assumption, the STILETTO design aimed at those architectural, engineering and technological solutions which proved the easiest to implement enabling easy and fast transfert of manufacturing know-how even to non-specialized and medium-low qualified workmen.

T9 Stiletto



  • TYPE
  • Two-seat light personal, training, club and aerial work aircraft.
  • Cantilever low-wing monoplane of constant chord.
  • Wortmann wing section.
  • Two demountable half wings of all metal structure (2024 T3) with main spar, forward and rear auxiliary spars and riveted aluminium alloy skin.
  • All metal mass-balanced ailerons actuated by pushrods in the fuselage frame section, by cables in the wings.
  • All metal, manually operated, two-position trailing-edge flaps.
  • Consist of two part: a crash resistent steel tube framework where the crew is and a demountable tailboom of aluminium alloy structure carrying the empennages.
  • The framework area is covered with easily removable panels of composite material.
  • Cantilever structure of aluminium alloy.
  • One piece all-moving tailplane, with combined anti-servo trim tab, actuated by pushrods in the fuselage frame section, by cables in the tailboom section.
  • Rudder actuated by cables.
  • Non-retractable tricycle type.
  • Main-wheels carried on flat spring fiberglass cantilever legs.
  • Nose free pivoting and non-steerable weel carried on cantilever spring steel leg.
  • Hydraulically-actuated differential brake control system operated by the pedals from the cockpit.
  • One 80 hp Rotax Bombardier 912, with propeller reduction gear, 4 stroke engine with opposed cylinders.
  • Two-blade fixed-pitch wood propeller.
  • Fuel single tank (for the prototype installed over the floor of the baggage area instead of beneath as foreseen in the production model) capacity 80 litres (21,1 US gallons).
  • Two individual adjustable seat, side by side.
  • Cockpit canopy hinged at rear to open upward (provision for taxiing with the canopy cracked open for hot-weather ventilation).
  • Baggage space aft of seats.
  • Electrical system of 12/14 V includes an alternator as main power source and a battery.
  • External power socket in fuselage side for engine starting.
  • A large instrument panel allows the installation of nav/com, ADF, trasponder and GPS.



Wing span
Length overall
10,26 (m)
6,85 (m)
Wings, gross 12,31 (sq.m)
Weigth empty 380 (Kg)
Max T-O and landing weight 650 (kg)
Useful load 270 (kg)
G limit 4,4 (.)
Max cruising speed at S/L 200+ (km/h)
Rate of climb, sea level (IAS 120/125 Km/h) 4+ (m/s)
Range, 170 Km/h, sea level, 30 min. rsv 740 (km)
Stall, flaps up, MTOW 80 (Km/h)
Stall, flaps down, MTOW 74 (Km/h)
Service ceiling 4200 (m)
Demonstrated crosswind 15 (kts)
Takeoff ground roll 100 (m)
Takeoff over 15 m (50 ft) obstacle 190 (m)
Landing over 15 m (50 ft) obstacle
(normal braking)
175 (m)



Pietro Terzi T9 Stiletto 01   Pietro Terzi T9 Stiletto 02   Pietro Terzi T9 Stiletto 03   Pietro Terzi T9 Stiletto 04
Pietro Terzi T9 Stiletto 05   Pietro Terzi T9 Stiletto 06   Pietro Terzi T9 Stiletto 07   Pietro Terzi T9 Stiletto 08
Pietro Terzi T9 Stiletto 09   Pietro Terzi T9 Stiletto 10   Pietro Terzi T9 Stiletto 11   Pietro Terzi T9 Stiletto 12
Pietro Terzi T9 Stiletto 13   Pietro Terzi T9 Stiletto 14   Pietro Terzi T9 Stiletto 15   Pietro Terzi T9 Stiletto 16


T9 Stiletto Flight Tests