Developments over recent years owe much to the efforts of companies and individuals involved in construction and flight testing of prototypes.

Clockwise from top left:

Sixth-scale model assembled from two DJI quadcopters and operated here by Phil Martin in Lancashire UK.

Half-scale prototype flown by Martin Andrews in Somerset UK (as pictured), and later by Ben Sena in California.

Full-size model flown in Lancashire by Alan of Drone Images and later (as pictured) at Llanbedr Airport by Austin Laws.

66%-scale model flown by Angus Benson-Blair, Somerset UK.

19th November 2022