[

E = frac{eta}{c}left( frac{C_L^{3/2}}{C_D} right) sqrt{2 rho S} left( frac{1}{W_f} - frac{1}{W_i} right)

]

Where (eta) is the propeller efficiency, (c) is the minimum power specific fuel consumption rate, maximum density of air, ( rho ).

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[

E = frac{eta}{c}left( frac{C_L^{3/2}}{C_D} right) sqrt{2 rho S} left( frac{1}{W_f} - frac{1}{W_i} right)

]

Where (eta) is the propeller efficiency, (c) is the minimum power specific fuel consumption rate, maximum density of air, ( rho ).