Solid bore fire stream reach
Couldn't find my copy of "Hydraulics for Firemen" by Theobald but the tests performed by FDNY for the City College of New York and reported in the above text from 1927, indicated that an effective reach for master streams could be estimated in still air as follows:
Nozzle pressure divided by two plus 45 will yield the approximate reach in feet. The oldest IFSTA in my library (1972) for "Fire Stream Practices" shows a graph on page 49 where the 50 psi hand line nozzle has an effective reach of 80 feet. The effective reach is specified as having 90% of the stream in a 15 inch circle and also 75% inside a 10 inch circle. Controlling factors are listed as: 1. Velocity of the stream at the exit of the nozzle.
2. Volume of water for the same stream velocity. 3. Horizontal reach is greatest at 32 deg. above flat ground. 4. Wind is still or less than 5 MPH.
This apparently has been an ongoing discussion for over 100 years, with similar results for anyone who has tried to determine fire stream reach.