One of the lesser known rocket projects from WWII Germany is the MF-5. I’ve found very little about this two-stage missile over the years… a mention in Ordway’s “International Missile and Spacecraft Guide” and a few drawings found buried in the NASM archive more than a decade ago.
According to Ordway, the “Nutcracker” was developed for the German Navy by Rheinmetall-Borsig at Marienfelde-Berlin. It was intended for use against low-flying aircraft. It was the fifth of the “Marine Flak” series; work began on it in July 1944, but was stopped in September. A Telefunken Kogge system was used for radio-remote control… but left unexplained was exactly how the missile was tracked. If it was meant for launch specifically from submarines, then presumably that means it was meant for underwater launch, in which case only a periscope would be available to track both the missile and the target… which seems a dubious prospect.
Length according to the drawing was 3238 mm, span over the main wing, 1290 mm. Other data from Ordway:
Weight: 473 pounds
Warhead: 25 pounds
Velocity: 536 mph
First stage thrust: 1,040 lbs for 0.9 seconds
Second stage thrust: 510 pounds for 10 seconds