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The small circular exhaust between the cones might well be an oil fume exhaust, which indicates an early pure turbojet, possibly utilising a total loss oil system.
Join Date: Dec 2001
Location: Nottingham UK
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You are of course correct Trevor.
The Caproni Campini N1
As Trevor says Open House
The Caproni Campini N1
As designed by Campini, the aircraft did not have a jet engine in the sense that we know them today. Rather, a conventional 700 kW (940 hp) Isotta Fraschini L. 121/R.C. 40 piston engine was used to drive a compressor, which forced air into a combustion chamber where it was mixed with fuel and ignited. The exhaust produced by this combustion was to drive the aircraft forward. Campini called this configuration a "thermojet," but the term "motorjet" is in common usage today for this arrangement since thermojet is now used to refer to a particular type of pulsejet (an unrelated form of jet engine). It has also been described as a ducted fan.