Jeff Findley wrote:

This thing had a lot to do with its creation, as it used the hydrogen
expander cycle to drive it:
http://tinyurl.com/8wj2sv


Our Net Nanny here at work does not allow bablefish to come through, but I
was able to figure out that you're pointing to this site:

http://xplanes.free.fr/suntan/cl400-10.html

The technology developed for Suntan engine did directly impact the design of
the RL-10.


That's the page alright; the picture of the spiraled heat exchanger is
particularly interesting.
There's more stuff (in English) he
http://www.hq.nasa.gov/office/pao/Hi...4404/ch8-1.htm

Pat