The Guiberson A-1020 (ATC 220) is a four-stroke diesel radial engine developed by for use in aircraft and tanks.
Development started in the 1930s with the A-918 designed by C C Spangenberger and A-980 designed by Fred A. Thaheld, which was first flown in 1931. It is a single-row direct drive nine cylinder-four cycle engine. Four A-918 were built.
Production A-1020’s and T-1020’s were designed and sold by Guiberson and produced by Buda Engine Co.
A T-1020 version was coincidentally produced for use in tanks. To demonstrate its capability to military and civil aviation officials in 1940, a 1500-mile flight from Dallas to Washington DC took 10h:35m flying time at an average 142mph. Cruising at 3000′ altitude at 1800rpm on Caterpillar tractor fuel (6 cents a gallon) consumed at the rate of 11.5 gph, cost was only $6.90. Three gallons of lubricating oil added $4.20—a total of $11.10 for fuel and oil for the flight. Its fuel cost of less than 12 cents a mile was an unheard-of figure for flight operations at the time.
Variants:
Guiberson A-980
210hp – the initial development model for use on aircraft.
Guiberson A-1020
340hp – production engines for aircraft use.
Guiberson T-1020
250hp for use in light tanks such as the M5 Stuart
Applications:
Waco 10 – A-980
Stinson Reliant – A-1020
M5 Stuart light tank – T-1020
Specifications:
A-918
1934
250hp
A-980
1932
ATC 79
185hp
A-1020
Type: 9-cyl air-cooled radial diesel piston engine
Bore: 5.125 in (130.18 mm)
Stroke: 5.5 in (139.70 mm)
Displacement: 1,021 cu in (16.73 l)
Dry weight: 650 lb (294.84 kg)
Designer: F. A. Thaheld
Power output: 340 hp (253.54 kW)
Compression ratio: 15:1
Specific fuel consumption: .42 lb/hp/hr (0.14 kg/kW/hr)
Oil consumption: 0.33 US gall/hr (1.25 l/hr
Power-to-weight ratio: 0.52 hp/lb (0.85 kW/kg)
All Aero 