TST-14 Bonus

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TST-14 Bonus is a two-seat motorless composite ultralight glider with optional engine installation.

TST-14 Bonus is designed mainly for leisure thermal flights. Its performance is comparable to common two-seat gliders. 
The handling of a Bonus is very easy thanks to its light weight. The wheels on the wing ends allow for independent taxiing and take off.

The major advantage of the TST-14 is the possible and easy installation of the power unit. That makes the TST-14 different from most gliders. Its very reasonable price allows customers to purchase a new glider, which takes off in towing and is suitable for thermal flights with the option of future engine installation in order to upgrade to the TST-14M.

Bonus is equipped with complete duplicate controls and avionics. These make it suitable for flying schools that provide training on motorless and motorized gliders.

Instrumentation of the TST-14 Bonus glider is fully optional - the customer can either choose instruments from our list of avionics manufacturers or he/she can supply the instrumentation himself/herself during the production of the ordered aircraft.
The Bonus can be delivered with an entire range of accessories and a trailer.

The flight characteristics, the quality of design, the wide range of instrumentation offered as well as the reliable power unit are key reasons for the popularity and commercial success of the glider. Since the completion and testing of the first prototype in 2005, we have sold 10 Bonus gliders to pilots in seven countries. From our experience, there is greater demand for the TST-14M model, which is the version with the engine installed.

Brief Glider Characteristics:
  • 17 meter wing span
  • Glide ratio 40
  • Complete duplicate controls
  • Long-life all-composite structure
  • Ready for installation of the power unit
  • Aerotow capable
  • Easy assembly, disassembly and transport
  • Easy maintenance

TST-14 Bonus - Technical Description

CHARACTERISTICS The TST-14 is a tandem two-seat, mid-winged monoplane with a cantilever wing, T-shaped tail and two-wheel tandem undercarriage. Its composite structure is made in negative molds.
WING The wings with sandwich structure is equipped with ailerons and air brakes on the upper surface. There are no ribs in the wing. The strength system of the wing is formed by the main spar, by the aileron spar and by the root rib. All the wing profile of the sandwich structure forms the torsion box.
The wings are interconnected by fittings and two horizontal pins. The connection wing-fuselage is made by means of pins and fittings placed in the fuselage and the wing root rib. The composite ailerons are hung by four hinges with the turning axis on the upper side. Air brakes on the upper side of the wing are made of aluminium and are retracted into pits.
FUSELAGE The fuselage with a shell structure is made in the negative mould together with the fin.
TAIL The tail is a T-shaped sandwich structure.
CONTROLS The controls, enabling pitch, roll, air brake and trim controlling, are of the lever design, with a push-pull rods system. The relevant backstops are placed on the stick. The yaw control with adjustable pedals is transmitted by cables. The airplane can be trimmed by a torsional member in the elevator drive that is controlled by a lever in the left of the front cockpit.
UNDERCARRIAGE The undercarriage consists of one unsprung main wheel 350x100 mm and one fixed front wheel. The brake handle is on the left side of the floor. The tail wheel 80x30 mm is turnable.

TST-14 Bonus - Technical Parameters

Wing span
17 m
Wing area
12.01 m2
Aspect ratio
8.24 m
Number of seats
MTOW without BRS
450 kg
472.5 kg 
Weight of crew 
65 - 180 kg
Vne 205 km/h
Max. maneuvering speed 150 km/h
Max. speed with extended air brakes      
150 km/h
Max. speed in aerotow 150 km/h
Stall speed
65 km/h
Max. theor. glide ratio without winglets  
37 by 105 km/h
Max. glide ratio with winglets  39 by 105 km/h 
Min sink rate
0,65 m/s pøi 85 km/h
Max. permitted load factor
+4 / -2 
Max. calculated load factor
+5.2 / -2.6
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