The Henschel Hs 297 Föhn or 7.3 cm Raketen Sprenggranate was a small German surface-to-air rocket of the Second World War.

Twenty-four of the launcher racks were assigned to the 3./ FlakLehruVersAbt 900 (o) ("3rd Battery of Anti-Aircraft Training and Testing Battalion 900 (stationary)") in the Remagen area and were used for the first time on 2 March 1945 against Allied fighter-bombers.

The specimens found were either emplaced statically, with the pedestal bolted to a foundation or were mounted on a circular folding platform which was carried on a two-wheeled trailer.

To achieve full 360° of traverse it was necessary to remove the launcher from the trailer, support it on the jacks, then unfold the circular platform and fasten the pedestal to the foundation.

[3] The launcher consisted of a square framework holding 35 launch racks, a pedestal mount with a shielded operators station, plus traverse and elevation mechanisms.

The projectile was similar to the 7.3 cm Propagandawerfer 41 but instead of being filled with propaganda leaflets the Raketen Sprenggranate had an explosive warhead with dual fuzes.

The body contained a single stick of solid fuel propellant which was ignited by a percussion cap which fit in a pocket drilled in the center of the base plate.