Bf 109 V21 and Bf 109 X
by Charles Metz

The Bf 109 V21 (Pratt & Whitney Twin Wasp radial engine) and Bf 109 X (BMW 801 radial engine) prototypes are covered in:

Ebert, Kaiser and Peters: 'Willy Messerschmitt — Pioneer of Aviation Design' (The History of German Aviation series, No. 3; Schiffer [USA], 1993; 435 pages)

Radinger and Schick: 'Messerschmitt Bf 109 A-E' (Schiffer [USA], 1999; 136 pages) [English translation of 'Messerschmitt Me 109: von Bf (me) 109A bis 109E' (Aviatic Verlag [date unknown])].

The book by Radinger and Schick includes multi-view drawings of the BF 109 X on pages 120 and 121.

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