I posted Early Access Build 20170730 of Disputed Space. This build includes the following improvements to the Afterburner System:
1) Reduced minimum energy required for engaging Afterburner from 75% to 25%.
2) Changed Afterburner Energy bar graph to indicate if there is enough energy to engage the Afterburner. Orange means the Afterburner is ready. Red means it does not have enough energy to engage.
3) Improved the Afterburner sound. The sound is louder and the ramp up for the sound is much quicker. It gives better feedback for Afterburner system than previous sound.