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.