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The Acro II is a two-seat aerobatic sportsplane designed by US aviation enthusiast Paul Poberezny in the 1970s for amateur construction. It is an enlarged version of his previous Acro Sport I, sized up to carry two persons.

Design and development

The Acro Sport II is a short-span biplane of conventional taildragger configuration, typically built with open cockpits and spatted main undercarriage. Its structure is fabric-covered, steel tube fuselage and tail group, with wood wing structure.

General characteristics:

Crew: one
Capacity: one passenger
Length: 18 ft 10.25 in (5.7468 m)
Wingspan: 21 ft 8 in (6.60 m)
Height: 6 ft 7.75 in (2.0257 m)
Wing area: 152 sq ft (14.1 m2)
Empty weight: 875 lb (397 kg)
Gross weight: 1,520 lb (689 kg)
Powerplant: 1 × Lycoming O-360 4-cylinder, air-cooled, horizontally-opposed piston aircraft engine, 180 hp (130 kW)


Maximum speed: 152 mph (245 km/h; 132 kn)
Cruise speed: 123 mph (198 km/h; 107 kn)
Stall speed: 53 mph (85 km/h; 46 kn)
Range: 430 mi (374 nmi; 692 km)
Service ceiling: 20,000 ft (6,100 m)
Rate of climb: 1,200 ft/min (6.1 m/s)
Wing loading: 10.0 lb/sq ft (49 kg/m2)