<page_title> List of dreadnought battleships of the Royal Navy </page_title> <section_title> Iron Duke class </section_title> <table> <cell> HMS Iron Duke <col_header> Ship </col_header> <col_header> Laid down </col_header> </cell> <cell> 4 × shafts 2 x Parsons turbines 21.5 kn (39.8 km/h; 24.7 mph) <col_header> Propulsion </col_header> </cell> </table>
The Iron Duke-class has four shafts powered by two Parsons turbines for a speed of 21.5 knots (39.8 km/h; 24.7 mph).