I've changed the title a little bit, as generally the designation is given as "WNF 342" for "Wiener Neustadt Flugzeugwerke".
Two other photos of the WNF 342 V1 from Steve Coates/Jean-Cristophe Carbonel "Helilcopters Of The Third Reich" are
added. Interesting side note to the photos of the V1 in flight. In the mentioned book it is said, that those photos were taken
by Theodor Laufer, while laying on the ground, because then the perspective gave the impression of a greater height ! ;D