Q? on Quasi-Newtonian Propulsion

[Derek]

So, I'm getting back into modding SE4 (You may remember the DavesMods/DereksMods that eventually became part of Devnullicus mods, though I don't seem to get credit anymore... ) and one thing I want to add is Quasi Newtonian Propulsion. Looking over the P&N mod, it seems easy enough; just change the engines required per move from 1 to 3/4/5/6/etc... How exactly does it work? Is there an equations, such as something like (total move pts/engines per move) or something else simple that I am missing?

Thanks

Derek