With 6.0 comes a big change. A complete ground up rebuild of the calculator. All previous versions have been modifications to the original file from back in 2004.
What stemmed from a rebuild to add a second unit system turned into a ton of improvements. Most of these were on the back end to allow for easier development going forward. These improvements were passed on to the user in the form of plots of the values instead of select data points. Vehicle pitch has also been added, allowing users to see what goes on when climbing or accelerating.
On top of this the general UI has been overhauled to accommodate many of the features added since version 4.0.
Version 6.0 was released on 2/18/2021 by Treefrog.