THE new De Havilland Gipsy Major 130 h.p. aero‐engine designed by Major V. B. Halford is of the inverted air‐cooled four‐cylinder in‐line type.
(1932), "A New De Havilland Engine: The 130 Horse‐Power Inverted Gipsy Major Described and Illustrated", Aircraft Engineering and Aerospace Technology, Vol. 4 No. 11, pp. 277-281. https://doi.org/10.1108/eb029614
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