Agusta GA.70

The Agusta GA.70 was a four-cylinder, air-cooled, horizontally opposed engine developed in Italy for light aircraft and helicopter use. The GA.70/V featured a bottom sump for vertical applications and was rated at 61 kW (82 hp). It was produced in the 1950s and 1960s.^[1]

GA.70
GA.70 on display at the Hubschraubermuseum Bückeburg
Type	4-cylinder, air-cooled, horizontally opposed engine
National origin	Italy
Manufacturer	Agusta
First run	1955

Variants

GA.70/0

Horizontal mounting for light aircraft.

GA.70/V

Vertical mounting for helicopters.

Applications

• Agusta A.103
• Bölkow Bo 103
• de Bernardi M.d.B. 02 Aeroscooter
• Phoenix Minor
• Phoenix Major

Specifications (GA.70)

Data from Jane's All the World's Aircraft 1962-63.^[2]

General characteristics

• Type: 4-cylinder air-cooled horizontally opposed aircraft piston engine, (G.A.70/V - vertically mounted helicopter engine)
• Bore: 92 mm (3.6 in)
• Stroke: 86.5 mm (3.4 in)
• Displacement: 2.3 L (140.4 cu in)
• Length: 760 mm (29.9 in), (G.A.70/V - 470 mm (18.5 in))
• Width: 750 mm (29.5 in), (G.A.70/V - 540 mm (21.3 in))
• Height: 450 mm (17.7 in), (G.A.70/V - 470 mm (18.5 in))
• Dry weight: 80 kg (176 lb) dry
• Designer: M. Ginnini

Components

• Valvetrain: pushrod operated overhead valve, 2 x inlet + 2 x exhaust valves per cylinder
• Fuel system: Stromberg NAS 3 carburettor
• Fuel type: 80/87 octane
• Oil system: Pressure lubrication with a gear driven pump
• Cooling system: Air-cooled

Performance

• Power output: 54 kW (72 hp) at 3,100rpm, (G.A.70/V - 61 kW (82 hp) at 3,300rpm)
• Specific power: 23.35 kW/L (0.51 hp/cu in), (G.A.70/V - 26.6 kW/L (0.58 hp/cu in))
• Power-to-weight ratio: 0.67 kW/kg (0.41 hp/lb), (G.A.70/V - 0.765 kW/kg (0.465 hp/lb))