TST-14M Bonus

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TST-14M Bonus is a two-seat motorized composite ultralight self-launcher with a retractable power unit, suitable for thermal flying, wave or ridge flights and for clubs and flying schools. The aircraft also offers easy handling and the capability of independent take off.

TST-14M Bonus is designed mainly for leisure thermal flights. Its performance is comparable to common two-seat gliders. The plane is equipped with a retractable power unit enabling independent take off and reach of an airfield without any thermal support. Engine extraction and retraction is fully automatic and is controlled by electronic servo motors. The power unit is operated by the pilot using two buttons on the instrument panel. 
The handling of a landed Bonus is very easy thanks to its light weight. The wheels on wing ends allow for independent rolling and take off.

Users of the TST-14M Bonus are mainly pilots who enjoy sport thermal flights and also appreciate independent take off, safe landings at airfields, easy handling of the plane on the ground and the quick assembly/disassembly option. Bonus offers all of this at a low price with low operational costs.

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

The Bonus glider can also be delivered in a motorless version (type TST-14), ready for possible future engine installation. This makes it possible for a pilot to acquire a new glider that is prepared for easy installation of a power unit at any future date.

The instruments of the TST-14M Bonus glider are 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 Atlas 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 18 Bonus gliders to pilots in seven countries.

Brief Glider Characteristics:
  • 17 meter wing span
  • Complete duplicate controls
  • Glide ratio 39
  • Long-life all-composite structure
  • Retractable Rotax 503 power unit 
  • Independent taxiing and take-off; no off-airport landings and return transports
  • Ability to extract and retract the engine anytime during the flight
  • Up to 150 km range with the engine engaged
  • Aerotow capable
  • Easy assembly, disassembly and transport
  • Easy maintenance

TST-14M - Technical Description

The TST-14M 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.
The wings with a sandwich structure are equipped with ailerons and air brakes on the upper surface. 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.
The fuselage is of a shell structure is made in the negative mould together with the fin.
The tail is a T-shaped sandwich structure.
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.
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 wingtip wheels serve for independent taxiing and take-off. The turnable tail wheel 80x30 mm enables easy manipulation on ground.
Power Plant
ENGINE Rotax 503 with two separate membrane carburetors and reducer B, ratio 1:2. Electric starter.
PROPELLER The propeller is wooden, two-bladed with fixed adjustment; diameter 1200 mm. 
EXTRACTION The power plant is extracted by a 12V DC servo motor. The servo motor also ensures automatic opening and closing of the engine door in the aircraft fuselage and controls the locking pin, which balances the propeller into a horizontal position prior to engine retraction.
CONTROLS The retractable mechanism is handled inside the cockpit through the instrument panel. The pilot controls the extracting and retracting of the power unit with two push buttons on the instrument panel. The very movement is ensured by an electronic unit controlled by a microprocessor, which takes care of the automatic opening of the engine door, monitors the limit position of the power unit, signals the pilot about the exact situation and activity and connects the starter only in the fully extracted position. This electronic system also prevents any retraction of a running engine. Entire engine extraction/retraction lasts approximately 20 seconds. The retractable mechanism of the power unit enables self-launching and restart during flight.

TST-14M Bonus - Technical Parameters

Technical Data
Wing span
17 m
Wing area 12.01 m2
Aspect ratio
8.24 m
Number of seats
MTOW without BRS
450 kg
472 kg 
Weight of crew and fuel 
65 - 188 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 at 105 km/h
Max. glide ratio with winglets  39 at 105 km/h 
Min. sink rate
0,65 m/s at 85 km/h
Max. permitted load factor
+4 / -2 
Max. calculated load factor
+5.2 / -2.6
Power unit
Rotax 503
34 kW (46 HP)
2x membrane
Wooden, 1200mm
Fuel tank capacity
30 liters
Fuel consumption when climbing
11 liters / h
Fuel consumption at cruising speed
9 liters / h
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