Acro Sport I

Aerobatic homebuilt taildragger plane of the early 1970s

Overview

Acro Sport United States ICAO: ACRO 1972–Onward Active

The Acro Sport was developed by Paul Poberezny during the early 1970s for homebuilding and manufactured by Acro Sport Inc. It is a single-seat short-span aerobatic sportsplane powered by a single Lycoming O-360 engine and designed with an open cockpit and spatted main landing gear.

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Specifications

Units
Engine
1 × Lycoming O-360
Engine type
Piston
Power
180 hp · 134 kW
Avionics
Wing tips
No winglets
Seats
1
Crew
Cabin width
Cabin height
Cabin length
Exterior length
17 ft 6 in  ·  5.33 m
Tail height
6 ft 0 in  ·  1.83 m
Fuselage diameter
2 ft 7 in  ·  0.80 m
Wing span
19 ft 7 in  ·  5.97 m
Baggage volume
Gross weight
Empty weight
Max takeoff weight
1,350 lb  ·  600 kg
Max landing weight
Max payload
300 lb  ·  150 kg
Fuel capacity
20 gal · 100 L · 100 kg (AvGas)
Max cruise speed
130 kt  ·  150 mph  ·  241 km/h
Maximum speed
Cruise speed
Approach speed
56 kt  ·  64 mph  ·  104 km/h
Range
300 nm  ·  350 mi  ·  560 km
Fuel burn
Ceiling
20,000 ft  ·  6,100 m
Rate of climb
3,500 ft/min  ·  18 m/s
Takeoff distance
Landing distance
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EAA Acro Sport I ‘G-BTWI’

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Operational Context

The Acro Sport was designed by the American aviation enthusiast Paul Poberezny to replace the EAA biplane. It was built on sound aerodynamic engineering and provides performance and outstanding aerobatic capabilities in its category. The Acro Sport has a simple and straight forward design and has been favored by hundreds of schools for EAA project school flight programs. On January 11, 1972, the aircraft took to the air for the first time. It was later developed into Acro Sports II.

The Acro Sport is designed with two main wings stacked one above the other or also known as a biplane, and fitted with conventional tailwheel type landing gear. It has a wooden spruce wing structure with a wingspan of 5.9 meters and a wing area of 10.78 square meters. The aircraft is fitted with wide landing gear that offers outstanding ground handling, exceptional directional control, and uncomplicated landing capability. The single-seat Acro Sport is usually designed with an open flight deck and the entire structure is covered in fabric. It has a steel tube fuselage and tail assembly. The exterior length is 5.33 meters, the tail height is 1.83 meters, and the fuselage diameter is 0.8 meters.

The fully aerobatic Acro Sport is certainly perfect for sportsmen and intermediate aerobatic competitions. It is powered by a single carbureted Lycoming engine usually rated at 85 hp to 200 hp. The engine is a four-cylinder direct-drive, horizontally opposed, air-cooled, piston type. The aircraft has a maximum speed of 132 knots and a cruise speed of110 knots. The stall speed is 43 knots. It has a travel range of 300 nautical miles and can fly up to 20,000 feet. It can climb at a rate of 3,500 feet per minute. It has a maximum takeoff weight of 612 kg and a maximum payload of 145 kg. The empty weight is 408 kg while the maximum fuel tank capacity is 20 US gallons.