Kirk Alyn was considered for the lead as Jeff King/Rocket Man, but the part eventually went to Coffin.
King of the Rocket Men was budgeted at $164,984, although the final
negative cost was $165,592 (a $608, or 0.4%, overspend); it was the most expensive Republic serial of 1949. The serial, Republic production number 1704, was filmed between April 6 and 27, 1949. Two streamlined, bullet-shaped prop helmets were used with the sonic-powered, rocket-equipped backpack attached to a leather flying jacket. The first was made of lighter-weight materials and worn only during the various stunt action scenes; during filming, the single-hinged visors on both helmets frequently warped and would stick open or closed.
King of the Rocket Men lacks a colorful costumed
villain along the lines of Republic's earlier serials
Adventures of Captain Marvel and
The Crimson Ghost. The final chapter's flooding and destruction footage had previously been used by the studio as the centerpiece for 1941's
Dick Tracy vs. Crime, Inc..
Stunts •
David Sharpe as Jeff King/Tony Dirken/Prof Bryant (doubling Tristram Coffin in rocket suit, Don Haggerty & I. Stanford Jolley) •
Tom Steele as Jeff King/Burt Winslow (doubling Tristram Coffin and House Peters, Jr.) •
Dale Van Sickel as Jeff King/Tony Dirken (doubling Tristram Coffin in the helmet/rocket backpack and Don Haggerty) •
Carey Loftin as Burt Winslow (doubling House Peters Jr) •
Eddie Parker •
Bud Wolfe Rocket Man in action was played by three different Republic stuntmen. Dave Sharpe performed the leaps into the air and the acrobatics necessary to simulate flight. Tom Steele was the second stuntman in the rocket pack and helmet, and Dale Van Sickel took the role when Steele and Sharpe were unavailable or were being used in the same stunt shot. The first appearance of Rocket Man (Dave Sharpe) has him flying directly into the back of a fast-moving, tarp-covered truck, driven by stuntman Tom Steele, then getting into a fist-fight with Vulcan's henchmen; in that same fight sequence Tom Steele is also the stuntman in the Rocket Man costume.
Special effects Several shots in the serial feature the Rocket Man character flying across broad vistas of barren landscape, an effect achieved by
Howard and Theodore Lydecker running a full-sized dummy on internal
pulleys along a very long, taut wire tilted at a downward angle to the horizontal. The same strategy had produced remarkable flying sequences in the earlier Republic serial
Adventures of Captain Marvel (1941). Dave Sharpe's take-offs were accomplished with concealed springboards, and his landings by simply jumping down from some raised position into the film frame. The shots of King as Rocket Man taking off, flying, and landing were reused in three subsequent Republic productions featuring flying heroes:
Radar Men from the Moon (1952),
Zombies of the Stratosphere (1952), and
Commando Cody: Sky Marshal of the Universe (1953). Rocket Man's raygun "appeared to be a German
Luger (acceptable in this post-wartime serial) with a silvery cone propped over the barrel". The
tidal wave in the serial's final chapter is actually
stock footage taken from
RKO's once-thought-lost science fiction feature film,
Deluge (1933). Stock footage was being used for most of the chapters' cliffhanger endings, showing the "downward trend of late 1940s Republic serials". ==Release==