Version 0.3.3A steam turbine fan blade animations run at native frames per second rather than time based. So when max fps is set to unlimited the fans spin incredibly fast. Then when frame rate drops or set to a lower value the blades spin slower. Tested at varying speeds from 35-300 fps.

This may end up being unfixable, but I'll look into it.

It shouldn't be too difficult; rather than increment the rotation by a set amount each frame, increment it by speed * (System.currentTimeMillis() - prevTime).