I found this pdf about designing a test rocket engine written by some guy on the arocket list today. It's old and conservative, but interesting.
http://www.cientificosaficionados.com/libros/cohetes.pdf In addition Paul Breed offered these tips: If you want to make liquid propellant motors, plan on at least a year before you ever consider flying something. Everyone wants to start with something really cool, you will never finish this. Start with a static test of chunk of pipe with a pipe cap and some simple orfices on the end. When you can ignite that, measure chamber pressure and run it long enough to melt it, you are ready to build a real rocket motor. When you can reliably run the rocket motor over and over think about an airframe. You should probably buy Rocket propulsion elements by sutton and read it cover to cover. also buy Modern Engineering for design of liquid propellant rocket engines by Huzel and Huang. A previous version of Huzel and Huang is available for free as a PDF,(look for Nasa SP-125) I bought the book because five years ago it was much easier to sit around and read a book than a PDF. With ereaders and pad devices the free PDF might be ok today. Start participating with groups near you doing this sort of work. If at all possible come to FAR and observe. (Four weeks ago we have 3 different liquid propulsion motors running on the same day) -n
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