Hey why does this happen? Just wondering

[Zorin]

Originally Posted by -Ox-

Like when your flying or whatever, and your shot up and smoking. Your engine just catches on fire.. Why does this happen?

When your plane is smoking there is already a fire inside the fuselage which will grow and at some point burst through the hull.

Can be caused by the ammunition that hit your plane and set fuel on fire or leaked fluids will be ignited by the heat of the engine or other parts.