Patent ID: 7370469

Claim:
A rocket engine chamber comprising: a back structure and a heat exchanger structure located radially inwardly of said back structure; said heat exchanger structure comprising a plurality of integrally formed cooling passageways with adjacent ones of said passageways having a common sidewall structure; said heat exchanger structure being formed from a copper based material; each of said passageways having a top section which includes a hot gas contact surface which contacts hot gases flowing through said rocket engine chamber and an inner surface which forms part of a respective passageway; each of said contact surface and said inner surface being formed by an arc of a circle which extends from one sidewall of said respective passageway to an opposite sidewall of said respective passageway; each of said sidewalls being non-circular and having a non-uniform thickness; each of said passageways having a bottom section; said bottom surface having a non-uniform thickness and a smooth peripheral surface; and said back structure having a smooth inner peripheral surface which mates with the smooth peripheral surface of the bottom section.