Steam Turbines
Alright, so no one has yet powered an aircraft with one. However, they too have to be gently warmed up. Superheated steam could easily be 600 degrees C, and you'd have to dribble some through the turbine to let the blades warm up to prevent damage caused by rotor bow. Yep, same problems.
Nuclear steam plants are much less fussy - they've not got superheated steam available in the first place. In the early days of nukes their turbines were distinctly old-school in comparison to the last of the oil fired steam driven warships.
Last edited by msbbarratt; 2nd Jan 2017 at 14:08.