An aircraft fairing is a structure whose primary function is to produce a smooth outline and reduce drag.
An engine or motor is a machine designed to convert one form of energy into mechanical energy.
A bonnet/hood scoop, sometimes called bonnet airdam/air dam, is an upraised component on the hood of an motor vehicle that either allows a flow of air to directly enter the engine compartment, or appears to do so.
A motorcycle fairing is a shell placed over the frame of some motorcycles, especially racing motorcycles and sport bikes, with the primary purpose to reduce air drag.
The NACA cowling is a type of aerodynamic fairing used to streamline radial engines for use on airplanes and developed by the National Advisory Committee for Aeronautics in 1927.
A nacelle is a housing, separate from the fuselage, that holds engines, fuel, or equipment on an aircraft.
A Townend ring is a narrow-chord cowling ring fitted around the cylinders of an aircraft radial engine to reduce drag and improve cooling.
The wind lens is a modification on the wind turbine created by Professor Ohya from the Kyushu University as an attempt to be more efficient in production of electricity and less invasive to both humans and nature.