| Barry, 14.06.2016 17:42 A development of the AIR - 4 with rearranged struts and low pressure tyres to meet VVS requirement. First flown M-23 engine which gave unacceptable vibration problems, it was later fitted with 60 h.p. Walter engine and later a 85 h.p Siemens, but no orders were forthcoming. reply |