A preliminary study was conducted f o determine the f e a s i b i l i t y of using heat pipes i n a nuclear a i r c r a f t propulsion system. the sole transporter of heat. heat pipe systems were used. heat from the reactor. Another transferred the heat t o the a i r i n the j e t engine. Conceptural designs of t h e reactor, engine, and reactor t o e ine heat pipes a r e presented and the amount of U2% required f o r c r i t i c a l i t y i s estimated. a r e defined: wick pore size, wick thickness, heat pipe diameter and length, vapor flow area, a x i a l and r a d i a l heat flux; and temperatures of liquid, vapor, and s t r u c t u r a l materials. The factors t h a t l i m i t the heat pipe performance or d i c t a t e the design a r e identified. Design features t h a t s t r e t c h the state-of-the-art a r e pointed out.
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