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Siemetzki Asro 4



The ASRO-3 was used to develop the ultra-light side-by-side two-seater ASRO-4. Of welded steel tube construction covered with light-alloy, it had a fully enclosed fuselage pod and tapered tubular tailboom. It was fitted with an 130 shp BMW 6012 turboshaft mounted behind the rotor gearbox driving three-blade main and two-bladed tail rotors of composite construction.




The ASRO 4 was first displayed at the 1964 Hanover Air Show.

This machine flew in May 1964, and was tested for some while before being abandoned without achieving certification.



Engine: BMW 6012, 100/130hp
Rotor diameter: 7.22m
Rotor disk area: 403.45 sq.ft (37.48 sq.m)
Fuselage length: 5.78m
Height: 7 ft 11 in (2.41 m)
Empty weight: 840 lb
Max takeoff weight: 1,360 lb
Max speed: 99 mph / 160km/h
Cruise speed: 90 mph (144 kmh)
Climb: 985 ft (300 m)/min
Service ceiling: 12,467 ft (3,800 m)
Endurance: 1 hr 20 min



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