Revision as of 19:03, 17 May 2013 by Administrator1 (talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
A 1948 photo of The Cierva W.11 Air Horse helicopter prototype(tested and found that the rotors should be re-positioned for maximum efficiency) - Photo by The Imperial War Museum.

Early samples or models built to test the feasibility and use of a product

Pages in category "Prototypes"

The following 3 pages are in this category, out of 3 total.