This is my first post. I looked through many threads and could not find an answer to the question below. Well known equations in rocketry are: Delta Velocity = Ejection Velocity * ln (Final Mass / Initial Mass ) and Net Thrust = Mass Ejection Rate * Ejection Velocity – Current Mass * Acceleration The first equation does not refer to Mass Ejection Rate. If the Mass Ejection Rate (MER) is too small the thrust will not be sufficient for the rocket to take off. Increasing the MER one might get: Rocket takes off once Thrust > Weight Rocket takes off immediately at low acceleration Rocket takes off immediately at high acceleration Questions: Ignoring drag, is there an optimal thrust that provides maximum delta V for a rocket taking off from the ground?