Abstract: A propulsion system with a pintle for variable thrust is constructed such that the pintle contains a shaft at its fore end which passes through an opening in the thrust chamber wall and extends into a boss on the outside surface of the thrust chamber. A dynamic seal that maintains the pressurization of the thrust chamber while allowing movement of the pintle is positioned inside the boss, between the pintle shaft and the boss, and actuation of the pintle is achieved by a rack affixed to the fore end of the pintle and a gear that engages the rack. The dynamic seal, rack and gear are thus external to the thrust chamber, providing the thrust chamber with a compact external envelope, a greater thermal standoff, or both.

Abstract: A propulsion system with a pintle for variable thrust is constructed such that the pintle contains a shaft at its fore end which passes through an opening in the thrust chamber wall and extends into a boss on the outside surface of the thrust chamber. A dynamic seal that maintains the pressurization of the thrust chamber while allowing movement of the pintle is positioned inside the boss, between the pintle shaft and the boss, and actuation of the pintle is achieved by a rack affixed to the fore end of the pintle and a gear that engages the rack. The dynamic seal, rack and gear are thus external to the thrust chamber, providing the thrust chamber with a compact external envelope, a greater thermal standoff, or both.

Abstract: A flow-through thrust takeout apparatus comprises an injection manifold (coupler) mounted to an engine and having a manifold passage. A ball line is attached to the injection manifold, and has a ball line passage fluidicly coupled with the manifold passage. A ball clamp is movably connected with the exterior surface of the ball line. A tank interface is attached to the ball clamp. The tank interface and ball clamp form a socket around the ball line to be movable relative to the injection manifold and the ball line. The tank interface is attached to a fuel tank. The interface member has an interface passage fluidicly coupled with the ball line passage to permit fuel flow from the fuel tank to the engine. A valve is mounted between the engine and the interface passage, and is adjustable to control fluid flow between the tank and the engine. The apparatus transfers the engine thrust from the rocket engine to the fuel tank, and the flow-through passages permit fuel transfer from the fuel tank to the engine.