ROCKET - By William D. Jackson. A 15-ft. Inboard Setp Hydroplane. The "Rocket" is a boat designed for those who like their boats fast and sporty but still inexpensive to build and operate. Any motor, with or without reverse gear, will power the “Rocket". Auto motors that develop more than 35 horsepower, if of light weight, high speed design, will do nicely. Marine motors of similar high speed, light weight design will perlorm even better. A properly designed step hydroplane like the "Rocket” is planned to ride the water's surface. To start hydroplaning takes considerable power, but when planing trim has been established the motor can be throttled back without losing the planing action. Hydroplaning does, however, take more power than conventional boats require. Speed with the "Rocket" will, of course. depend on the motor that goes into her. Twenty five to sixty miles per hour and be obtained by proper powering.