Flatiron (ship)
Development
Development
-----------

Until the middle of the 20th century flatirons were built with [triple\-expansion steam engines](/wiki/Marine_steam_engine%23Triple_or_multiple_expansion "Marine steam engine#Triple or multiple expansion"). The largest steam flatirons were more than 1,550 [gross register tons](/wiki/Gross_register_tonnage "Gross register tonnage"). The last steam\-powered flatirons were built in the 1950s.

By the middle of the 1940s flatiron [motor ships](/wiki/Motor_ship "Motor ship") with [marine diesel engines](/wiki/Marine_diesel_engine "Marine diesel engine") were being built. The largest motor flatirons were more than 1,870 GRT and more than 2,800 [deadweight tons](/wiki/Deadweight_tonnage "Deadweight tonnage").


Can you name any other types of engines used in flatirons besides steam and diesel?