Originally Posted by
Chris Scott
There seems to be one BMEP gauge per engine (a parameter with which I',m not familiar), side by side.
Chris, the BMEP gauges are simply torquemeters. For whatever reason Pratt&Whitney decided to lable them as psi of Brake Mean Effective Pressure, an abstract theoretical quantity representing the average pressure in the cylinders during the power stroke. Ultimately I guess it doesn’t matter whether ithe units are psi bmep or inch-pounds, you learn the numbers and apply them in operation. Thats why i said earlier that it would be interesting to know what the bmep gauge for the left engine showed, bmep is the best indication of how much power is being developed, whether it was producing more thrust or more drag.