Jurca MJ-7 Baby Mustang

To facilitate homebuilding replicas of fighter planes, designer Marcel Jurca has created a scaled-down ver-sion of the P-51 Mustang, the Supermarine Spitfire and the Focke Wulf FW-190. The Mustang is available in 2/3 (MJ-7) or 3/4 scale (MJ-77). Only the relative size of a pilot’s head identifies the Baby P-51 from its bigger brother. The ship first flew with a 200-hp Ranger inline engine. Others that can be used include: any of the six-cylinder Rangers, the 125-hp Mènasco, the 130-hp Gipsy Major, the 125 to 160-hp Canadian Rambler, or the General Motors Buick F58. Materials used are wood and fabric.

The Mustang replica is of all-wood construction and uses many components from the aircraft industry. It has a retractable undercarriage and conventional flight control surfaces and flaps. The fuselage, wings and empennage are of sitka spruce framework with a plywood covering and an exterior finish of thin fiberglass. It is powered by a six-cylinder Lycoming aircraft engine.

Although capable of carrying two persons, with the second seat removed and an additional fuel tank installed, the design represents the earlier P-51B with the high rear fuselage, rather than the more common P-51D with a bubble canopy.
The two-thirds scale replica P-51B Mustang is the model MJ-7-G.

Boeve Fiberglass Components Inc offered full kits (1997) for US$35,000. Plans were selling for US$500.

MJ-7
Engine: V8 350/351, 330 hp.
HP range: 200-330.
Height: 8.7 ft.
Length: 22 ft.
Wing span: 24.5 ft.
Wing area: 112 sq.ft.
Weight empty: 1800 lbs.
Gross: 2450 lb
Fuel cap: 52 USG.
Speed max: 300 mph.
Cruise: 255 mph.
Range: 1000 sm.
Stall: 69 mph.
ROC: 2000 fpm.
Take-off dist: 800 ft.
Landing dist: 1000 ft.
Seats: 2.
Landing gear: retractable tail wheel.

MJ-7-G P-51B Mustang
Engine: Lycoming O-540, 260 hp
Maximum speed: 200 mph (322 km/h)
Loaded weight: 1900 lb (862 kg)
Span: 24 ft 9 in (7.5 m)
Length: 23 ft 3 in (7.1 m)
Height: 6 ft 3 in (1.9 m)
Wing area: 114 sq ft (10.6 sq m)

Wingspan 25’l0”
Length 22’4”
Gross Wt. 2000 lb
Empty Wt. 1175 lb
Fuel capacity 30 USG
Top speed 225 mph
Cruise 175 mph.
Stall 65 mph.
Range 570 miles
Takeoff run 900 ft
Landing roll 800 ft

Boeve Fibreglass Components MJ-7
Engine: V8 351/350, 330 hp
HP range: 200-330
Height: 8.7 ft
Length: 22 ft
Wing span: 24.5 ft
Wing area: 112 sq.ft
Empty weight: 1800 lb
Gross weight: 2450 lb
Fuel capacity: 52 USG
Top speed: 300 mph
Cruise: 235 mph
Stall: 69 mph
Range: 1000 sm
Rate of climb: 2000 fpm
Takeoff dist: 800 ft
Landing dist: 1000 ft
Seats: 2
Landing gear: tailwheel retractable
G limits: +6/-4