Interesting - the main difference is that apparently all SFU ships have to travel the same speed - in other ACTA Games max speed was different for each ship.
re turning both previous versions of ACTA worked like this:
A ship had a maximum move rate from 4-16".
Normally a ship had to move half of its maximum movement before it could turn and an extra 2" before it can turn again
Without SA (Like All Stop!) always had to move at least half it maximum move
Ships had a set maximum of turns (unjless again a SA like Come About!- bit like HETs)
1 x 45, 2x 45, 1 x 90 or 2 x90
Agile: The ship can pull very high-G turns, allowing it to out-manoeuvre other vessels with ease. This ship need only move ¼ of its Speed in a straight line before making turns, and need only move 1” in a straight line before making subsequent
turns.
Lumbering: Either under-powered or simply too massive for the most advanced engines, this ship is ungainly and turns slowly. It may only make a single turn during a Movement Phase, and may never make more under any circumstances. In addition, the ship may not move forward any further after making this turn
However you could also use Planets like this (even if lumbering):
Slingshot
There is another way to use a gravity well – to accelerate your vessel to incredible speeds. This is called a Slingshot. In order to do this, a ship must move towards a planet (in other words, end up closer than when it started) and end its movement within the planet’s gravity well. In addition, the ship must also keep any part of the planet in its Fore fi re arc. If it accomplishes these conditions, then the ship will automatically be moved an extra distance forward equal to that shown on the Planetary Table and may also make an additional 45o turn (or less) at any time during this movement. Even ships reduced to 0 Speed or Running Adrift (but not those with the Immobile trait) may take advantage of this Speed increase if
they are within the gravity well and the planet is in their Fore arc.
To give an idea of how it worked for Centauri fleet:
A Primus was a relatively quick but ungainly Battlecruiser
Max Speed 8, Turn 1x45, Lumbering
A Elutarian was a Bombardment cruiser with average agility
Max Speed 8, Turn 1x45,
A Vorchan was a sleek fast attack ship
Max Speed 14, Turn 2x45, Agile
The Liati, a stunningly agile battlecruiser designed to hunt down White Stars
Max Speed 14, Turn 2 x90, Agile