Girish Mahajan (Editor)

Letov ST 4 Aztek

Updated on
Edit
Like
Comment
Share on FacebookTweet on TwitterShare on LinkedInShare on Reddit
Wingspan
  
10 m

Manufacturer
  
Letov Kbely

Letov ST-4 Aztek httpsuploadwikimediaorgwikipediacommonsthu

The Letov ST-4 Aztek (English: Aztec) is a Czech microlight aircraft that was designed and produced by Letov Kbely of Prague - Letňany, in the 1990s. When it was available the aircraft was supplied as a complete ready-to-fly-aircraft, or as a kit for amateur construction.

Contents

In January 2014 the ST-4 was no longer listed as a product of the company.

Design and development

The aircraft was designed to comply with the Fédération Aéronautique Internationale microlight category, including the category's maximum gross weight of 450 kg (992 lb). The ST-4 Aztek features a strut-braced high-wing, a two-seats-in-side-by-side configuration enclosed cockpit, fixed tricycle landing gear with wheel pants, a small tail skid and a single engine in tractor configuration.

The aircraft is made from aluminum tubing with fairings made from fibreglass and its flying surfaces covered in Dacron sailcloth. Its 10.40 m (34.1 ft) span wing, mounts flaps and has a wing area of 15.21 m2 (163.7 sq ft). The wings are supported by "V" struts with jury struts and the empennage is cable-braced. The acceptable power range is 45 to 50 hp (34 to 37 kW) and the standard engine used is the 50 hp (37 kW) Rotax 503 two-stroke powerplant. The engine is mounted high above the cockpit on the front end of the aluminum tube that acts as the tail boom.

The ST-4 Aztek has a typical empty weight of 220 lb (100 kg) and a gross weight of 450 lb (200 kg), giving a useful load of 230 lb (100 kg). With full fuel of 57 litres (13 imp gal; 15 US gal) the payload for pilot, passenger and baggage is 189 kg (417 lb).

The manufacturer estimated the construction time from the supplied kit as 80 hours.

Operational history

By 1998 the company reported that 26 kits had been sold and 15 aircraft were completed and flying.

Specifications (ST-4 Aztek)

Data from AeroCrafter

General characteristics

  • Crew: one
  • Capacity: one passenger
  • Length: 5.91 m (19.40 ft)
  • Wingspan: 10.40 m (34 ft 1 in)
  • Wing area: 15.21 m2 (163.7 sq ft)
  • Empty weight: 220 kg (484 lb)
  • Gross weight: 450 kg (992 lb)
  • Fuel capacity: 15 U.S. gallons (57 L; 12 imp gal)
  • Powerplant: 1 × Rotax 503 twin cylinder, air-cooled, two stroke aircraft engine, 37 kW (50 hp)
  • Propellers: 4-bladed composite

    • Performance

  • Maximum speed: 132 km/h; 71 kn (82 mph)
  • Cruise speed: 97 km/h; 52 kn (60 mph)
  • Stall speed: 50 km/h; 27 kn (31 mph) flaps down
  • Range: 341 km; 184 nmi (212 mi)
  • Service ceiling: 2,700 m (9,000 ft)
  • Rate of climb: 3.8 m/s (750 ft/min)
  • Wing loading: 29.5 kg/m2 (6.05 lb/sq ft)

    • References

    Letov ST-4 Aztek Wikipedia
    (Text) CC BY-SA