['< sod > the j3 battlecruiser design had four geared [ [ steam turbine ] ] sets, each driving one propeller shaft, and arranged in two engine rooms. the forward engine room held the two turbines for the wing shafts, while the aft engine room contained the turbine for the port and starboard inner shafts. the turbines were powered principally by 18 [ [ yarrow shipbuilders | [UNK] yarrow ] ] [ [ water - tube boiler | small - tube boilers ] ] divided between those nine boiler rooms. they were designed to produce a total of { { convert | 151000 | shp | lk = in } } at a working pressure of { { convert | 200 | psi | 0 | abbr = on | lk = on } } and temperature of { { convert | 200 | °c | 65 °f } } with [ [ superheater | superheat ] ]. maximum speed would have been { { convert | 34 | kn | lk = in } }. < ref name = c44 > campbell, davies pt. 4, p. 44 < / ref > < eod > < sod > the j3 battlecruiser design had four geared [ [ steam turbine ] ] sets, each driving one propeller shaft, rotated and arranged in two engine rooms. the forward engine room effectively held the two turbines for the wing shafts, while the aft engine room contained the turbine for the port and starboard inner propeller shafts. the turbines were powered by 18 [ [ yarrow shipbuilders | yarrow ] ] { { clarify | built by yarrow or [ [ yarrow boiler ] ] article type? | date = october 2016 } } [ [ water - tube boiler | small - tube boilers ] ] divided between nine boiler rooms. they were designed to produce a total of { { convert | 151000 | shp | lk = in } } at a working pressure of { { convert | 200 | psi | 0 | abbr = on | lk = on } } and temperature of { { convert | 200 | °c | °f } } with [ [ superheater | q superheat ] ]. maximum speed would have been { { convert | 34 | kn | lk = in } }. < ref name = c44 > campbell, pt. 4, p. 44 < / ref > < eod >']