The Rotational Power generator for the iron tier is the steam engine. It comes in two parts the Boiler and the Steam Engine itself.
The boiler is a large building that will produce a significant amount of steam (enough for multiple steam engines.
It has a fluid input for water as well as an item input for fuel.
On the back there is a fluid output for steam. that can be connected to via pipe.
The boiler is the first building to use the temperature system. When the boiler is first given fuel it will consume it at an increased rate to increase its temperature. Upon reaching max temp the boiler will start converting water to steam and consume fuel at a reduced rate. If the boiler is ever unable to work due to a full output, empty input or no fuel it will start to lose temperature and will need to reheat before it can work again.
The steam engine is a bit simpler, it consumes steam from the pipe input at the back and has a single shaft output on the side.
The output speed of the steam engine is constant and the output torque scales with the pressure of the steam given to it.
And of course the steam engine has an awesome animation when it is running.
