Attack drones and Engines |

While playing my last game I was building some attack drones that I wanted to load onto a space station. So I was building my drone ship and strapped a bunch of ion engines to the ship.
Now here are my questions:
1)Does a ship need an engine to move while at combat? Does the number of engines affect how fast the ship can fly in combat or is it determined strictly by the ships size?
2)If the speed is determined by the ships size, does a combat drone/fighter need any engines if they are used only during combat?
In stock
In stock, yes. In mods that might be different.

Combat Speeds in Balance Mod
The system speed is equal to the combat speed for most vehicles in the Balance Mod with the exception of fighters. They move faster disproportionately faster in combat than system movement.
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System and Comabt Speeds
The speed of a vehicle in combat is determined by the movement amount it has (ie # of engines) and a setting with each vehicle entry in VehicleSizes.txt that determines how much a system movement point will count towards combat speed. Vehicles with no engines will not move in combat - although I think Drones in stock have a movement bonus built into their hulls so they might move a bit.
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Space Empires Depot | SE:V Balance Mod