1920s German trainer aircraft
The LFG V 39 was a simple biplane trainer built in Germany in the mid-1920s. It took part in the Round Germany Flight in the summer of 1925.
Design and development.
The V 39 was a two bay biplane with constant chord wings mounted with slight stagger and a wide gap. The fabric covered wings had box spars and three-ply ribs. There were ailerons on both upper and lower wing, externally rod-connected. The upper wing was centrally supported with cabane struts.
The trainer was designed to be powered by a Mercedes D.I or D.II engine. It is known that the smaller engine at least was flown. The fuselage was deep bellied, flat sided, constructed from wood and covered with three-ply. There were two open, tandem cockpits, the rear one provided with vision enhancing trailing edge cut-outs in both upper and lower planes. The V 39's undercarriage was standard for the time, with mainwheels on a rigid axle supported by fuselage mounted V-struts and with a tailskid.
The V 39 was designed to combine modest performance with reliability and robustness with easy handling and a low landing speed.
Operational history.
The V 39 was one of more than ninety aircraft to take part in the Round Germany Flight held in the summer of 1925.
Specifications.
"Data from" Flight 28 May 1925 p.323General characteristics* Aspect ratio: * Propellers: 2-bladed 
Performance* Endurance: * g limits: * Roll rate: * Maximum glide ratio: * Time to altitude: 8 min to 1,000 m (3,280 ft)*Landing speed: 55 km/h (34 mph)
References.
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