A Ram Jet Instructional Test‐rig

A LOW‐SPEED ramjet engine mounted in a static test‐rig makes an unusually versatile educational aid in the teaching of such subjects as thermodynamics, gas dynamics, jet propulsion, combustion and heat transfer. This article describes such a rig, in which the engine, which is 15in in length and 5in in diameter, is suspended in an air stream on a hydraulically‐damped linkage enabling thrust and drag to be measured (see figures 1 and 3).