2. A RAM JET MISSILE COMPRISING A MISSILE BODY, AN OUTER SHELL ENCLOSING A PORTION OF SAID BODY AND SPACED THEREFROM TO FORM AN ANNULAR DUCT TERMINATING IN A NOZZLE, INLET OPENING MEANS IN SAID DUCT THROURG WHICH SAID FLUID FROM THE SURROUNDING MEDIUM IS ADAPTED TO FLOW THROUGH THE SAID NOZZLE, AND MEANS WITHIN THE SAID BODY FOR EXPANDING AND DRIVING THE SAID FLUID OUT THROUGH SAID NOZZLE AS A PROPULSIVE POWER JET, THE SAID MEANS COMPRISING A SUBSTANTIALLY GAS-TIGHT CONTAINER POSITIONED IN AND IN SPACED RELATION TO THE SAID DUCT IN CONTACT WITH SAID FLUID THEREIN, A COMPOUND CARRIED INSIDE SAID CONTAINER AND ADAPTED UPON ACTUATION TO INTERACT EXOTHERMICALLY, WITHOUT LOSS OF WEIGHT, AND MEANS FOR ACTUATING SAID REACTION TO PRODUCE SUBSTANTIAL HEAT FOR HEATING SAID FLUID, SAID COMPOUND BEING FREE OF DIRECT CONTACT WITH SAID FLUID.