Once a common sight at large airports, the
distinctive DC-8 ejector/reverser mechanisms are seldom seen or thought
about today, other than possibly by modelers. From left to right
we see the back end of the JT4 engine, the sound suppressor, and the
ejector (extended in this view.) The ejector was said to increase
thrust by some small amount by drawing in more air at the front and
mixing it with the hot core exhaust stream, thus increasing volume and
body. Perhaps it helped quiet the engine slightly also?
Less obscure is the fact that the ejectors were
the carriers for the reverser clamshells. The whole assembly slid
fore and aft under hydraulic power along the track visible on the
bottom of the
pylon; they were always extended for takeoff and landing.
This photo shows the installation on an Eastern DC-8-21.