turbojette

Turbojette is a term used in some discussions of propulsion to describe a compact, small-scale turbojet engine designed for micro air vehicles and model aircraft. The name blends turbojet with the diminutive suffix -ette to indicate a smaller than typical propulsion unit.

Origins and usage of the term are informal; turbojette is not an official designation in aviation standards or certification regimes. It appears mainly in hobbyist literature, speculative design discussions, and some experimental work where engineers explore the feasibility of miniature turbojet configurations for constrained airframes.

Design concepts associated with the turbojette generally envision a compact single-spool or two-spool turbomachinery arrangement, with a simplified compressor, turbine, and nozzle. Key engineering goals include reducing overall weight, enabling rapid start and throttle response, and integrating controls with lightweight airframes. Material choices emphasize high-temperature alloys and advanced composites to cope with elevated turbine temperatures, while lubrication and cooling remain critical design challenges.

Performance characteristics are highly variable but typically conceptualized as delivering tens to a few hundred newtons of thrust, with specific fuel consumption higher than larger jet engines. Applications are envisioned for high-speed micro air vehicles, research platforms, or educational demonstrations, where compact form and rapid response are valued. Noise, regulatory constraints, and maintenance requirements are significant considerations in any practical implementation.

See also: turbojet, model aircraft engines, microturbine.