Questions related to the textbook "How to Design, Build and Test Small Liquid-fuel Rocket Engines" by Leroy Krzycki
HOW to DESIGN, BUILD and TEST SMALL LIQUID-FUEL ROCKET ENGINES is a 1967 textbook by Leroy J. Krzycki. It was originally printed by ROCKETLAB of China Lake, California. The textbook is available for download at several Internet sites, for example here
The "Additions and Corrections" page at the link above notes that the text contains several known errors.