1980->

TeST TST-3 Alpin T

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Alpin TM

Originally a single seater, World Class performance glider, with “T” tail, nose type tow hook and one wheel undercarriage significant upgraded Alpin, the TST-3 Alpin T kit sailplane has tandem seating for two, with an option for a retractable engine (TST-3 Alpin TM), and with a 44 ft wingspan This aircraft flew several 500 km FAI triangles – in gliding mode (1998).

The TST-3 TL, is a lighter version of the TST-3 T; its pilot broke a series of records in cross-country flights in the 220 kg flying weight category (2001).

JAR 22 certified.

Air Est Services of Marley in France would supply either plans or kits for the TST-1 and would even build a completed sailplane.

TeST TST-1 Alpin

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The firm designed its first wooden ultralight glider, the TST-1 Alpin, and tested the prototype in 1993. Despite gliding parameters that could bring smiles today, the glider demonstrated a couple of interesting performance feats – e.g. several 300 km FAI triangles and even a 500 km FAI triangle.

The Aplin is a standard club type with a 40.7 ft wingspan for the novice and average skill pilot.

Air Est Services of Marley in France would supply either plans or kits for the TST-1 and would even build a completed sailplane.

Initial engine options were the Czech built UVMV of 28 hp or a 24 hp Koneig.

The design was imported to Canda and sold by Boohemican International. Certified as European ultralight. In 1997, Ready to fly price $15,250, and a two to three month delivery date on kits. Plans cost $325.

The JAR 22 certified single seater glider / motorglider version has a detachable auxiliary Rotax 447 engine in pusher configuration.

There is a tractor version called the TST 1 Junior.

TeST spol sro

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The company TeST was established in 1992 by three enthusiastic, experienced glider pilots. Their initial goal was to design and manufacture ultralight motor gliders and ultralight aircraft.

During the few first years, production was carried out in a hangar in Křižanov. The firm designed its first wooden ultralight glider, the TST-1 Alpin, and tested the prototype in 1993. Despite gliding parameters that could bring smiles today, the glider demonstrated a couple of interesting performance feats – e.g. several 300 km FAI triangles and even a 500 km FAI triangle.

The company rented new production facilities in Velké Meziříčí in 1995 and production capacity grew to 10 aircraft a year. The development and production of new aircraft then continued, featuring mostly wooden construction:

  • TST-7 JUNIOR more or less an ALPIN with the engine mounted in the front and a fixed three-wheel undercarraige (1995)
  • TST-6 DUO, two seat motor glider similar to the JUNIOR (1996)
  • TST-5 VARIANT, an alternative to the DUO with shorter wings (1996)
  • TST-3 ALPIN T, a significantly upgraded ALPIN, also supplied with a retractable engine (TST-3 ALPIN TM). This aircraft flew several 500 km FAI triangles – in gliding mode (1998).

1998:
Zahradni ul.
CZ-59401 Velke Mzirici
Czech Republic

In September 1998, TeST moved to larger facilities in Velká Bíteš allowing production to increase to 25 aircraft a year. The development of new types continued:

  • TST-8 ALPIN DM, a new tandem two seater with a retractable engine (1999)
  • TST-9 JUNIOR, a modernized TST-7 with an elliptical fuselage and T-shaped tailplanes (2000)
  • TST-3 TL, a new lighter version of the TST-3 T; its pilot broke a series of records in cross-country flights in the 220 kg flying weight category (2001).

In order to satisfy increased demand, the company moved again in November 2002, this time to its new facilities in Velké Meziříčí. Development activity began to focus mainly on composite technology. The following aircraft were designed:

  • TST-10 ATLAS M, the first two seater made of composites with a retractable engine opened the new era of technologies based on carbon fiber – also supplied as the motorless TST-10 ATLAS (2002).
  • TST-12, a tandem low-wing plane combining modern features and traditional wooden construction (flown in summer of 2004; built as a prototype only)
  • TST-13 JUNIOR 2005, an all-composite successor to the TST-9; span of 15 m
  • TST-14 BONUS M, a tandem all-composite two seater; production commenced in 2004 TST-14 BONUS.

The newly designed aircraft – the TST-10 ATLAS, TST-13 JUNIOR and TST-14 BONUS – formed the core of the 2009 production program and have brought a great deal of commercial success.

The original wooden construction was replaced by composite technology in 2002. Detraction and retraction of the engine is fully automatic and controlled by an electronic device.

The development and design of the new aircraft is in cooperation with experts from the Faculty of Mechanical Engineering at the VUT University of Technology in Brno and the Light Aircraft Association (LAA ČR), which helps to increase the quality and safety of newly designed aircraft.

The aircraft are designed to meet existing and anticipated standards and regulations in the overall UL category – maximum flying weight of 300 kg (or 322 kg during BRS use) for single seaters or 450 kg (or 472 kg during BRS use) for two seaters. The minimum speed is always under the 65 km/h limit, often conforming to even stricter standards (JAR-22).

2009: K Libusi 4/24
Praque 4 148 00
Czech Republic

In 2009 TeST Aircraft were marketed in North America by Bohemican International, 36 Buchanan Road, St. Cathatires, Ontario L2M 4R6, Canada.

Teratorn Tierra

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Single or side by side two seat single engined high wing monoplane with conventional three axis control. Wing has unswept leading and trailing edges, and constant chord; cruciform tail. Pitch control by elevator on tail; yaw control by fin mounted rudder; roll control by full span ailerons; control inputs through stick for pitch/roll and pedals for yaw. Wing braced from below by struts; wing profile NC; double surface. Undercarriage has three wheels in tail dragger formation; nylon rope suspension on tailwheel and steel spring sus¬pension on main wheels. Ground steering by differential braking. Brakes on main wheels. Aluminium tube framework, partially enclosed (totally enclosed optional). Engine mounted above wing driving pusher propeller.

One of the revelations of Sun ‘n’ Fun in March 1983 at Lakeland was the prototype Tierra with which Teratorn Aircraft made a spectacular entrance into that section of the ultralight market which is in direct competition with traditional light air¬craft. This machine offers the facility to be used either as a single seat ultralight or to be transformed into a US category experimental aircraft by the addition of a second scat, the problem of centre of gravity shift being resolved by positioning the single seat in the centre of a wide cockpit, so that it only has to be moved sideways to make room for two. The single stick is central and, as the Tierra has two rudder bars, it becomes a dual control machine when fitted with both seats.

The fuel tank is mounted behind the seating low down at the rear of the cockpit which closes with the clever use of zips for the side panels, the windows coming down to the lower longeron of the cabin. This enclosure is available as an option, as are isolation panels for the cabin. These are made of soundproof material and fit behind the cabin and above the wing and are easily removable. The structure of the Tierra is formed from triangular frames. All the joints in the airframe are reinforced with a strong high density elastic foam pressed into the tubes which absorbs vibration and eliminates metal to metal con¬tact.

Engine location is above the cabin, the motor using dyna focal mounts as in modern conventional aviation. It is a Rotax 377 cc unit fitted with a reduction drive and Teratorn’s own Flexidyne type clutch system. Finally comes an accessory which is still rare in ultralight aviation: the horizontal tail surface of the Tierra is fitted with a trimmer permit¬ting maximum stability in flight regardless of the load carried or its position.

Tierra
Engine: Rotax 377, 36hp at 6600rpm
Propeller diameter and pitch 60 x 36 inch, 1,52 x 0.91 m
Toothed belt reduction, ratio 2.6/1
Max static thrust 245 lb, 111 kg
Power per unit area 0.24 hp/sq.ft, 2.7 hp/sq.m
Fuel capacity 5.0 US gal, 4.2 Imp gal, 18.9 litre
Length overall 18.5 ft, 5.64 m
Height overall 6.0ft, 1.83m
Wing span 31.5ft, 9.60m
Constant chord 4.5 ft, 1.37 m
Sweepback 0 deg
Total wing area 142 sq.ft, 13.2 sq.m
Wing aspect ratio 7.0/1
Empty weight 253 lb, 115kg
Max take off weight 550 lb, 249 kg
Payload 297 lb, 135 kg
Max wing loading 3.87 lb/sq.ft, 18.9 kg/sq.m
Max power loading 15.3 lb/hp, 6.9 kg/hp
Load factors; +6.0, 3.0 ultimate
Max level speed 63 mph, 101 kph
Never exceed speed 63 mph, 101kph
Cruising speed 50mph, 80kph
Stalling speed 25 mph, 40 kph
Max climb rate at sea level 800 ft/min, 4.1 m/s
Min sink rate 300ft/min, 1.5m/s
Best glide ratio with power off 10/1
Take off distance 50 ft, 15 m

Tierra 1
Engine: Rotax 277
Empty wt: 253 lb
Max wt: 650 lb
Wing span: 31ft
Wing area: 154 sq.ft.
Wing loading: 4.22 lbs/sq.ft
Power loading: 23.21 lbs/hp
Max speed: 62 mph
Cruise: 55 mph
Stall: 26 mph
Vne: 75 mph
Seats: 1

Tierra 11
Engine: Rotax 532
Empty: 385 wt. lbs
Max wt.: 850 lbs
Wing span: 36ft
Wing area: 190 sq.ft.
Wing loading: 4.38 lbs/sq.ft
Power loading: 13.08 lbs/hp
Max speed mph: 75
Cruise mph: 60
Stall mph: 30
Vne mph: 80
Seats: 2

Tierra UL
Engine: Rotax 277 (268 cc) 28 hp
Static thrust: 180 lbs
Empty wt: 249 lbs
Wing span: 30’6”
Wing area: 155 sq.ft
Height: 5’8”
Length: 18’6”
Fuel cap; 5 USG
Construction: Aluminium, Dacron, Steel
Max wt: 500 lb
Stall: 24 mph
Max speed: 60 mph
Vne: 70 mph
Climb rate: 500-600 fpm
Design limit: +6, -3g
Glide ratio: 10-1
Wing loading: 3.23 lbs/sq.ft
Power loading: 17.86 lbs/hp

Tennessee Propellers Scout

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Tennessee Propellers of Normandy, Tennessee, is a company better known for their wooden maple laminate aircraft propellers, but the company also acted as the exclusive distributor for the Zenoah G-25 and G-50 line of engines. To compliment these product lines they developed the Scout powered parachute which is powered by the 45 hp (34 kW) G-50 driving a Tennessee propeller.

The Scout was designed to comply with the US FAR 103 Ultralight Vehicles rules, including the category’s maximum empty weight of 254 lb (115 kg). The aircraft has a standard empty weight of 225 lb (102 kg). It features a parachute-style high-wing, single-place accommodation, tricycle landing gear and a single G-50 engine in pusher configuration. The 50 hp (37 kW) Rotax 503 engine was a factory option.

The aircraft carriage is built from powder coated welded 6061-T6 aluminum tubing and is a highly simplified design compared to other powered parachutes. In flight steering is accomplished via foot pedals that actuate the canopy brakes, creating roll and yaw. On the ground the same foot pedals control the nosewheel steering. The main landing gear incorporates fiberglass spring rod suspension. Standard equipment factory provided included a large canopy-stowage bag, electric engine starting, flight instruments and a four-point pilot harness.

The Scout was supplied as a complete ready-to-fly aircraft, introduced in 1999, but is no longer available. Unit cost in 2001 was US$10,000.

Engine: 1 × Zenoah G-50, 45 hp (34 kW)
Wing area: 400 sq ft (37 sq.m)
Empty weight: 225 lb (102 kg)
Gross weight: 485 lb (220 kg)
Fuel capacity: 5 U.S. gallons (19 L; 4.2 imp gal)
Cruise speed: 25 mph (40 km/h; 22 kn)
Rate of climb: 400 ft/min (2.0 m/s)
Wing loading: 1.21 lb/sq ft (5.9 kg/sq.m)
Crew: one