Spacek SD 1 Minisport

Design and development

The aircraft features a cantilever low-wing, a single-seat enclosed cockpit, fixed conventional landing gear or optionally tricycle landing gear, a T-tail and a single engine in tractor configuration. Due to its very light weight it can qualify for the German 120 kg category. It complies with the United Kingdom SSDR rules for single seat deregulated microlight aeroplanes.

The aircraft is made from wood, with judicious use of composites, including for the wing spar. Its 6 m (19.7 ft) span wing employs an A315 airfoil, has an area of 6 m² (65 sq ft) and utilizes flaperons. Engines of 24 to 50 hp (18 to 37 kW) can be used. Standard engines tested are the 28 hp (21 kW) Hirth F33, the 50 hp (37 kW) Hirth F23 two-strokes, the 24 hp (18 kW) Briggs and Stratton Vanguard, or the Verner JCV-360 powerplants. The Rotax 447, Hirth 2702, Zanzottera MZ 201, Simonini Victor 1, 2si 460 and Half VW can also be used.

By November 2015 113 had been sold worldwide and about 41 were flying.

At the end of May 2014 SkyCraft Airplanes announced that light-sport flight testing on its version had been completed. Their model has a revised cockpit, including Dynon SkyView instrumentation, a hydraulic brake system and the 50 hp (37 kW) Hirth F-23 two-stroke fuel-injected engine. The company's intention was that 12 aircraft would be built for the first production run. However, as of 5 April 2016 the SD-1 was still not on the Federal Aviation Administration's list of accepted light-sport aircraft.

Variants

SD-1 TD

Conventional landing gear (taildragger) version

SD-1 TG

Tricycle gear version

SD-1 TD XL

Conventional landing gear (taildragger) version for taller pilots

SD-1 TG XL

Tricycle gear version for taller pilots

SD-2 SportMaster

2-seat tricycle gear version

Specifications (SD-1)

Data from Bayerl and Spacek sro

General characteristics

Crew: one

Length: 4.35 m (14 ft 3 in)

Wingspan: 6 m (19 ft 8 in)

Height: 1.23 m (4 ft 0 in)

Wing area: 6 m² (65 sq ft)

Airfoil: A315

Empty weight: 110 kg (243 lb)

Gross weight: 240 kg (529 lb)

Fuel capacity: 34 litres (7.5 imp gal; 9.0 US gal)

Powerplant: 1 × Hirth F33 single cylinder, air-cooled, two stroke aircraft engine, 21 kW (28 hp)

Propellers: 2-bladed wooden, 1.2 m (3 ft 11 in) diameter

Performance

Maximum speed: 190 km/h (118 mph; 103 kn)

Cruise speed: 155 km/h (96 mph; 84 kn)

Stall speed: 63 km/h (39 mph; 34 kn) flaperons deployed

Never exceed speed: 210 km/h (130 mph; 113 kn)

g limits: +4/-2

Maximum glide ratio: 13:1

Rate of climb: 3 m/s (590 ft/min)

Wing loading: 40 kg/m² (8.2 lb/sq ft)