Walter 109-509C rocket engine combustion chamber, c 1944.

The Walter 109-509C two-chambered rocket engine was intended for use on Germany's Meserschmitt Me 263 and Junkers Ju 248 second generation rocket-powered interceptor aircraft, but hostilities in Europe ended before it was made operational. It burned a fuel mixture of methyl alcohol and hydrazine in hydrogen peroxide. The photograph shows a sectioned version of the smaller chamber. The fuel was pumped between the two layers of its double skin to keep it cool.