As I couldn't find it in the list, I'll add it here: A twin seat, twin engined helicopter, which made its maiden flight during the
summer of 1962. Weight 300 kg, rotor diameter 6.90m, powered by two laterally mounted
motorbike engines of 50 hp each. Series production with two 100 hp engines was planned,
but never came to frution.
Mentioned in Flight 1962 (http://www.flightglobal.com/pdfarchive/view/1962/1962%20-%200896.html),
photo and data are from "Der Flieger", October 1963.
the Pidek PI-4 was a development of JP.2B helicopter,with placed two turbine engines on the
side of the fuselage capacity of 150 hp power.