Editing Cassin-class destroyer (section)

===Engineering===
Most references list the propulsion plant of ''Cassin'' and ''Cummings'' as standard for the class.<ref name=Conways1/> However, the Navy's official ''Ships' Data Book'' for 1912 shows there was some variation.<ref name=ships12>{{cite web | url=https://books.google.com/books?id=DnCjAAAAMAAJ| title=Ships' Data, U.S. Naval Vessels, 1912 | publisher=US Navy Department | date=1913 | access-date=5 March 2016 | pages=60–71}}</ref> ''Cassin'' and ''Cummings'' had four [[Normand boiler]]s supplying steam to two [[direct-drive]] [[Parsons Marine Steam Turbine Company|Parsons]]-type [[steam turbine]]s driving two shafts for a total of {{convert|16,000|shp|kW|lk=on|abbr=on}}. A small [[triple-expansion engine]] could be clutched to one shaft for economical cruising at moderate speeds. Early steam turbines were inefficient at low speed, and this was only remedied with the rise in steam pressure and the introduction of [[gear]]ed cruising turbines during World War I. ''Downes'' had [[Thornycroft boiler]]s and ''Duncan'' had [[Yarrow boiler]]s. Both of these had Curtis steam turbines and triple-expansion cruising engines on both shafts.<ref name=ships12/>

''Downes'' made {{convert|29.14|kn}} on trials at {{convert|14,254|shp|kW|lk=on|abbr=on}}. Normal fuel oil capacity was 312 tons.<ref name=Friedman1/>