Determining a carburetor throath diameter

[petertha]

Some similar discussion here. In post#5 I made some charts showing various orifice sizing & tried to overlay as many actual engines as I had access to. The methanol vs gasoline & 2S vs 4S & engine type/duty probably make for too many design variables that don't necessarily belong on the same chart, but might help with initial scoping.

http://www.homemodelenginemachinist.com/showthread.php?t=26098&highlight=venturi