I also had this question during one of my early games. Check out the anydice website (forum rules prevent a link) for some graphs showing the distribution of different dice combinations

It is the number of engines for the air frame of the aircraft type
1e = 1 Engine
2e = 2 Engines
4e = 4 Engines

Think F16 (1e) vs F15 (2e) vs C-130 Hercules (4e)

It might come down to the ability of your logistics network to keep up.
For example I'm considering trying a second SHQ in my current game because even with maxed out logistics assets at my current SHQ I am still bottle necked around the SHQ. Everywhere else is ok

So that means that if you want to build monitor tanks you go do the following?
Raise Formation >> Independent >> Heavy Tank >> Select Monitor Tank Model

<t> This is right, use the best equipment for the enemy you are facing.<br/>
My current opponent does not field much armour so I prefer the soft attack backed up with RPGs and some air-force with precision bombs (precision bomb for hard attack, bomb hatch for soft attack).<br/>
<br/>
I use the ...

Hi Iain,

Howitzer is more effective against soft targets and high velocity is more effective against hard targets

Hi Roger,

No Pop up with the same background process only