The tandem two-seat Sperocco (the name being a contraction of ‘Special Sirocco’) is intended for high performance aerobatic and competition flying and incorporates features of the MJ-5 and MJ-7. The fuselage is of completely new design, with a basically triangular cross-section, but is of similar construction to that of the MJ-5. Landing gear is of the MJ-5 type and is fully retractable.
Any horizontally opposed engine of 112-179 kW (150-240 hp) may be installed. Fuel is contained in two wing tanks, each of 55 litres (14.5 US gallons; 12 Imp gallons) capacity, and one fuselage tank of 45 or 100 litres (11.9 or 26.4 US gallons; 10 or 22 Imp gallons) capacity.
The first MJ-51, powered by a 149 kW (200 hp) Textron Lycoming AIO-360 engine, is being constructed by M Serge Brillant at Melun.

DIMENSIONS, EXTERNAL:

• Wing span: 7.623 m (25 ft 0 in)
• Length overall: 7.24 m (23 ft 9 in)

AREA:

• Wings, gross: 11.00 m² (118.4 sq ft)

WEIGHT:

• Max T-O weight: 730 kg (1,653 lb)

PERFORMANCE (estimated, with 112 kW; 150 hp Textron Lycoming engine):

• Max level speed: 149 knots (275 km/h; 171 mph)
• Max cruising speed, 75% power: 135 knots (250 km/h; 155 mph)
• Stalling speed: 49 knots (90 km/h; 56 mph)
• Time to 1,000 m (3,280 ft): 1 min 30 s

The article appears in the following publication:
Jane's All the World's Aircraft 1991-92. Jane's Information Group Ltd. 1991. ISBN: 0-7106-0965-5