TYPE: Single-seat ultralight motor glider/kitbuilt.
PROGRAMME: Designed by Jerzy Krawczyk; initial JK-01 flown in mid-1990s with 9.00 m (29 ft 6¼ in) span and 9.00 m² (96.9 sq ft) wing area.
Revised JK-01a developed to specifications of XC Aviation of Glasgow, UK. Prototype registered (in France) as W64-MA and made public debut, complete but not then flown, at International Microlight Exhibition, Popham, UK, on 29-30 April 2006.
COSTS: Kit GBP10,990 excluding engine; or GBP13,750 all carbon fibre. Flyaway GBP3,660 extra. Engine GBP1,725. Instruments not included (2006).
DESIGN FEATURES: Combination of cross-country ultralight and thermal- or ridge-soaring sailplane; intended to incorporate high technology at low cost and meet British BCAR Section S criteria. Uses some components of Ekolot JK-05. Constant-chord wings with upturned tips mounted in mid-position immediately behind pilot; narrow tailboom; low-mounted, single-piece elevator to rear of rudder; underfin.
Aerofoil section MM18-17 to give mild, stable stall, unaffected by rain or insect adhesion.
FLYING CONTROLS: Manual. Flaperons, single-piece elevator and full-height rudder. Actuation by cable (rudder only) and pushrods.
STRUCTURE: Generally of Parabeam glass fibre, plus carbon fibre for main spar, cockpit rovings and tailboom. Optionally, all carbon fibre.
LANDING GEAR: Tricycle type; fixed. Twin mainwheels mounted at fuselage hips to give narrow track; no shock absorption.
POWER PLANT: One 14.9 kW (20 hp) JPX D330 flat-twin, two-stroke piston engine driving a Peszke three-blade folding propeller via toothed belt. Fuel capacity 15 litres (4.0 US gallons; 3.3 Imp gallons).
EQUIPMENT: Optional Alphaparachute ballistic recovery parachute.
DIMENSIONS, EXTERNAL:
- Wing span: 11.12 m (36 ft 5¾ in)
- Length overall: 5.65 m (18 ft 6½ in)
- Height overall: 1.92 m (6 ft 3½ in)
- Wheel track: 0.30 m (1 ft 0 in)
AREAS:
- Wings, gross: 10.80 m² (116.3 sq ft)
WEIGHTS AND LOADINGS:
- Weight empty: carbon fibre: 80 kg (176 lb)
- composites: 145 kg (320 lb)
- Max T-O weight: 250 kg (551 lb)
PERFORMANCE, POWERED:
- Newer-exceed speed (VNE): 81 kt (150 km/h; 93 mph)
- Normal cruising speed: 59 kt (110 km/h; 68 mph)
- Max rate of climb at S/L: 66 m (216 ft)/min
- g limits (ultimate): +6/-3
PERFORMANCE, UNPOWERED:
- Best glide ratio: 24
- Min rate of sink: 1,10 m (3,60 ft)/s
