Slitherine

In the editor, what is the approximate scale of the game hexes, and how long is each turn supposed to be? I'm working on a series of WW2 sea battles, but can't seen to get realistic results.

Hex and unit scale is whatever you want it to be...
Take a look at the artillery ranges to find a suitable hex size. The Unit Navigator should help you here http://mfendek.byethost16.com/
I find battalion is the sweet spot for unit size, but you can stretch this up to regiment/brigade or down to company/platoon.
You set the number of turns pr day or number of days pr turn in the editor. This should be proportional to the hex scale and thus govern movement range.
OOB is like a giant rubber band

Thanks! Actually I think it's better for naval engagements, so that's what I focus on... but using BB range & movement as the benchmark for calibrating the rest is a great idea.

Then you might be interested in my naval mode, it basically replaces te generic movement points with more historical correct ones.
I've also doubled air movements.
This mod can be used to play all official and custom scenarios, you just need to copy the campaign/scenario into the respective folders in the mod.

https://www.dropbox.com/s/c6phxbh9spfkl ... 0.zip?dl=0