I hope I have not upset to many people by my last statement!
Briefly the method used was to take high RPM, high HP, glow RC engines and bury them in the fuselage of a jet and bolt a multi blade fan onto it. Glow plug life and RC engine life was a problem, as well as the noise produced. They were very loud and did not produce a realistic noise.
R/C Jet Engines. (Gas Turbines)
The ultimate power source for the modern jet. This is a REAL gas turbine. Computer technology and the latest materials has brought the miniature gas turbine to the field of model jets. For the most experienced flyers only! Please be advised that this is the most expensive of all the options!
Model R/C Jets ( Propeller Powered)
This system has been around the longest. In the air the propeller is all but invisible and some very realistic scale models can be flown.
Turboprop Model Jet Engines Explained.
The latest 2-stage turbines are shown and simplified. The Composite ART Tucano is featured along with links to manufacturers.