Throttle Control for any Rocket

@sflanker Thank You. I will mess around a bit more now with your help. Much appreciated.

You basically want to maintain a certain Thrust to Weight Ratio. A rough estimate can be achieved by determining the required Thrust based on the current Mass, Gravity, and Maximum Thrust. These are all constantly changing unless you moving, and/or burning propellant. The basic equation is Throttle = (TWR * Mass * Gravity) / MaxThrust. A TWR of 1.0 is hovering, a TWR of 2 will cause you to accelerate at 1x Gravity assuming you are going straight up. As you leave the atmosphere and escape the gravitational influence of your parent body this formula becomes less useful, and what you really want to adjust for is your rate of acceleration directly (instead of as a factor of gravity as TWR does).