the experiment. Since, η is nearly constant even with alarge variation in L⋆, anaveraged value of η could beused in the deter mination of regression rate using combustion chamber pressure. This dispels the doubts expressed by George et al. [30] regarding the correctness of using a single value of combustion efficiency.
To obtain the regression ratevs Gox using combustion chamber pressure the following proced ure was adopted . It is an improvement over the methodology proposed by George et al. [30]. This was solved using a FORTRAN code: