Hirth Hi 27 Acrostar Mk.II
The Acrostar is an aerobatic aircraft specially designed for competitions.
It was designed at the end of the 1960s by the aerobatic pilots Horst Gehm, Josef Hößl, Arnold Wagner and Walter Wolfrum in response to the demand for more powerful competition aircraft. The Wolf Hirth Company produced a total number of nine examples. On display is the prototype whose first flight took place in 1970.
The design of the aircraft was trendsetting at the time and it ranked highly in many aerobatic competitions in the early 1970s. The Acrostar had, for the first time, equally good performance and flight characteristics at both positive and negative angles of attack due to a symmetrical profile. It had exceptional strength (+ 8 g/- 8 g). It was equipped with an automatic wing flap control, which was coupled with the elevator for increased manoeuvrability. The aircraft is predominantly made of wood, The wing spar was made of GRP laminates (glass fibre reinforced plastic).
- Manufacturer: Wolf Hirth GmbH, Nabern/Teck, 1970
- Wingspan: 8.3 m
- Take-off weight: 630 kg (aerobatics)
- Top speed: 305 km/h at sea level
- Nosedive speed: 400 km/h
- Range: 620 km
- Propulsion: 6-cylinder boxer engine Franklin 6A-350-C1
- Power: 160 kW (220 hp)