Found this to explain a little better. Tony, you are correct.
Rocket-powered vehicles have been active in motorsports for ninety-five years. The hydrogen peroxide/silver catalyst motor was pioneered by Pete Farnsworth, Ray Dausman and Dick Keller and their Reaction Dynamics company which created drag racing’s first effective rocket dragster, the record-shattering X-1 “Rislone Rocket”, in 1966. Rocket-powered motorcycles are nothing new. More than a dozen have been campaigned in the United States alone since the early 1970s.
One of the sport’s most popular misconceptions states all rocket-powered machinery, including hydrogen peroxide versions, was banished from the sport in the 1980s. However, no rocket vehicle was ever banned by any drag racing association. The number of active rockets dropped severely during that period when premium grade, (100% purity), peroxide became a rare commodity. However, there have always been rockets in drag racing, (from dragsters to Funny Cars to motorcycles to go-karts), from 1966 to the present day. The peroxide was available in far greater quantities in Europe which enticed several of the best-known racers, including legendary rocket racer “Slammin’ Sammy” Miller, to simply move overseas to be closer to the fuel source. Many teams learned to compete with lower quality peroxide and continued to race.