When in 1943, the Allied bomber stream raids plaguing the Reich increased more and more, a call for interceptors rose, which were to be stationed especially near to the critical industrial plants and dedicated to their defence specifically.
So, by and by, several "Objektschutzstaffeln" (Target Defence Squadrons) were formed. These were equipped with regular fighter planes (i.e. Messerschmitt Me 109's/Focke Wulf Fw 190's) and stationed near to the industrial plants. Due to problems with the availability of appropriate space for the airfields, means were sought to develop fighters with extreme short take-off and landing capabilities.
Rheinmetall-Borsig was one of the contending companies for such a "point defence fighter", proposing the Rheinmetall-Borsig VTOL 1, which was to take-off vertically and land conventionally with a tricicle wheeled undercarriage.
A short time afterwards the Rheinmetall-Borsig VTOL 2 was drafted, having two jet engines. Due to the wing configuration, no undercarriage could be incorporated, which meant that the vertical take-off was achieved with a provisional starting device using an AA-gun muzzle. Landing was to be done vertically also.
RLM (Reichsluftfahrtministerium = German Air Ministry) deemed the two projects as too difficult to realize soon. On top, there was the worsening war situation, which meant, that these proposals were shelved soon.
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