Mitek...The general form of the equation is good for either english or metric units, as long as you stick with the standard units (feet, seconds, and slugs and their derivatives in english, or meters, seconds, and kilograms and their derivatives in metric). Consistency is the key. What you have there is a form of the equation that's been de-standardized so that units familiar to and used commonly by r/c modelers can be directly plugged in without conversion. Unless the units for each variable are specified, that form of the equation is completely meaningless.

Indeed, that's quite a mishmash of units. English nonstandard mph, english nonstandard ounces, english standard square feet, and metric nonstandard g/L.

The units for the general form of the equation would call for, respectively, ft/s, slugs, square feet, and slugs per cubic foot; or m/s, kg, square meters, and kilograms per cubic meter.