Based on our results we have concluded that the engine efficiency of the rocket has a direct relationship with the amount of fuel needed to gain the required velocity of 9km/s. As the payload increases the fuel increases. This also works the other way around, as the fuel increases the payload capacity also increases. We have also concluded that there is also a relationship with the amount of payload weight that is available and the varying engine efficiencies with varying fuels. As the exhaust velocity increases the amount of needed fuel decreases. We conclude that, based on our results, the ideal rocket exhaust velocity is between 3.5 and 4.5. We have concluded this based on the assumption that engine efficiency is expensive and difficult, so our conclusion observes the point where the curve rounds.