Game in the Brain

So the Thrust to Weight Ratio determines an Efficiency Curve for the Mass Ratio (Fuel to total Mass of the Ship). The weaker the engine the smaller the total amount of 

Today I Learned the Following:

1. Mass Ratio: Payload (cargo, controls, and life support) to Propulsions (engine and fuel) has a steep curve at 1:3 to 1:10. Dont need to exceed 1:10, the sweet spot is 1:3. 
2. I need More Engines as I start pushing past 1:3 Payload to Propulsion Ratio. 
3. There is an Efficiency Ratio of Engine to Propulsion. I’m not sure what it is but probably 1:3 – One part engine and 3 parts Fuel at the max. 
4. The THRUST TO WEIGHT and of course the Specific Impulse (Which is the miles-per-galon or Km per Liter metric of the Engine) – the RAPTOR Engine at 200 T2W ratios is a crucial point before we can hit 5 Kms and above economically. 200 T2W to 2000 T2W is crucial in TL8 to TL9. Before the time we Hit 2000 T2W we will be hitting some additives to fuel – probably suspended metals or other stuff that go boom under the same temp. 
5. 0G manufacturing – developing new Nano-Built materials will be crucial in the chamber pressure, reusability, heat management, and so many factors in making an engine get more powerful. 

Then I figured out I should Chart by Delta-V and Ratio. 

TL8 Engines

TL9 Engines