A	Cross-area of pipe
$I_{tp}$	Moment of inertia of turbopump rotor
L	Length of pipe
$P_a$	Oxidizer pipe branch point (a) pressure
$P_b$	Fuel pipe branch point (b) pressure
$P_C$	Combustion chamber pressure
$P_{fic}$	Combustion chamber fuel injector inlet pressure
$P_{fig}$	Gas generator fuel injector inlet pressure
$P_G$	Gas generator pressure
$P_{oic}$	Combustion chamber oxidizer injector inlet pressure
$P_{oig}$	Gas generator oxidizer injector inlet pressure
$R_C$	Combustion chamber gas constant
$R_G$	Gas generator gas constant
$T_C$	Combustion chamber temperature
$T_G$	Gas generator temperature
$V_C$	Combustion chamber volume
$V_G$	Gas generator volume
${\dot{m}}_{cn}$	Nozzle inlet flow rate
${\dot{m}}_{FIC}$	Combustion chamber fuel injector flow rate
${\dot{m}}_{FIG}$	Gas generator fuel injector flow rate
${\dot{m}}_{f2}$	Gas generator fuel flow rate
${\dot{m}}_{f3}$	Combustion chamber fuel flow rate
${\dot{m}}_G$	Gas generator outlet flow rate
${\dot{m}}_{OIC}$	Combustion chamber oxidizer injector flow rate
${\dot{m}}_{OIG}$	Gas generator oxidizer injector flow rate
${\dot{m}}_{o2}$	Gas generator oxidizer flow rate
${\dot{m}}_{o3}$	Combustion chamber oxidizer flow rate
${\dot{m}}_G$	Generated mass flow rate from solid propellant
${ϵ}_{fc}$	Amount of time delay in combustion fuel injector
${ϵ}_{fg}$	Amount of time delay in gas generator fuel injector
${ϵ}_{oc}$	Amount of time delay in combustion oxidizer injector
${ϵ}_{og}$	Amount of time delay in gas generator oxidizer injector
$\lambda$	Pressure loss coefficient
${\rho }_f$	Fuel density
${\rho }_o$	Oxidizer density
${\tau }_{fp}$	Fuel pump torque
${\tau }_{op}$	Oxidizer pump torque
${\tau }_{tb}$	Turbine torque
$\omega$	Angular velocity of turbopump