query: instance_of u engine
supports: A bus (archaically also omnibus, multibus, motorbus, autobus) is a road vehicle designed to carry many passengers. Buses can have a capacity as high as 300 passengers. The most common type of bus is the single-decker rigid bus, with larger loads carried by double-decker and articulated buses, and smaller loads carried by midibuses and minibuses; coaches are used for longer-distance services. Many types of buses, such as city transit buses and inter-city coaches, charge a fare. Other types, such as elementary or secondary school buses or shuttle buses within a post-secondary education campus do not charge a fare. In many jurisdictions, bus drivers require a special licence above and beyond a regular driver's licence. An H engine (or H-block) is an engine configuration in which the cylinders are aligned so that if viewed from the front, they appear to be in a vertical or horizontal letter H. H (named "aitch" or also "haitch" plural "aitches" or "haitches") is the eighth letter in the ISO basic Latin alphabet. A locomotive or engine is a rail transport vehicle that provides the motive power for a train. The word originates from the Latin "loco"  "from a place", ablative of "locus", "place" + Medieval Latin "motivus", "causing motion", and is a shortened form of the term "locomotive engine", first used in the early 19th century to distinguish between mobile and stationary steam engines. The straight or inline engine is an internal-combustion engine with all cylinders aligned in one row and having no offset. Usually found in four, six and eight cylinder configurations, they have been used in automobiles, locomotives and aircraft, although the term in-line has a broader meaning when applied to aircraft engines, see Inline engine (aviation). An aircraft is a machine that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines. An aircraft engine is the component of the propulsion system for an aircraft that generates mechanical power. Aircraft engines are almost always either lightweight piston engines or gas turbines, except for small multicopter UAVs which are almost always electric aircraft. A U engine is a piston engine made up of two separate straight engines ( complete with separate crankshafts ) joined by gears or chains . It is similar to the H engine which couples two flat engines . The design is also sometimes described as a `` twin bank '' or `` double bank '' engine , although these terms are sometimes used also to describe V engines . This configuration is uncommon , as it is heavier than a V design . The main interest in this design is its ability to share common parts with straight engines . However , V engines with offset banks can also share straight engine parts ( except for the crankshaft ) , and this is therefore a far more common design today when both engine forms are produced from the same basic design . Engine configuration is an engineering term for the layout of the major components of a reciprocating piston internal combustion engine. These components are the cylinders and crankshafts in particular but also, sometimes, the camshaft(s).
candidates: aircraft aircraft engine alphabet bus city distance eight engine engine configuration force four front gas letter locomotive machine rail transport road secondary education secondary school six system term train word
answer: engine configuration