First flight of the Bristol Type 173 Mk. 1
Thursday, January 3, 1952
This is a Significant Operational milestone.
Description:
The Type 173 was the first Britsh helicopter to employ two engines and twin rotors. It was also the first compound helicopter that transferred some lift from the rotors to a fixed wing. The pilot was Charles "Sox" Hosegood. Chief Designer was Raoul Hafner.
Source: AHS Calendar January 2012
and
Source: "Bristol 173 Takes the Air", FLIGHT, 11 January 1952
