RC MODEL MICRO TURBOJET ENGINE IN INDIA

A gas turbine engine is a machine that converts energy rich liquid fuel in to a powerful  pushing force called thrust. When I started my research on model jet engines also known as RC-micro jet engine, because fascinated by gas turbine engines. I really impressed by their small size and cost.

The model gas turbine engine is not as complex as axial flow  compressor turbine engines, instead a simple centrifugal compressor design and working  principle. They works on same principle as the modern airplane or fighter jet gas turbine engines. Generally producing a thrust by combustion of  a fuel in combustion chamber, produces high pressure and high velocity expanding gases, resulting in thrust.                                              `                                                                                                                                                                                                                                                                                                                                                                                                The model gas turbine engine has only one moving part (rotating part) – the main rotating shaft, rotates about an 80,000 to 1, 20,000 rpm, maximum speed. Generally the maximum rpm of the jet engine depends on the size of the turbine wheel, as the size of turbine wheel decreases, the max rpm of the shaft or engine increases. Vice versa as the size of the turbine wheel increases, the max rpm of shaft or engine decreases. For example if the jet engine having a turbine wheel of 54mm has a maximum rpm of 1, 20,000. And a jet engine having a turbine wheel of 84mm the maximum rpm ranges between 60,000 to 80,000. The main rotating shaft connects the compressor wheel at front of the engine to the turbine wheel at the back together.                                                                                                                                                                                                                                                              

It uses a billet or cast aluminum high precision centrifugal compressor, like uses in an automotive turbochargers. Compressor is well balanced by high precision balancing machines to withstand about 1, 00,000 RPM. At this speed slightly imbalance can produce catastrophic event. It increases the pressure of the air and its temperature. The rear turbine wheel of the jet engine is cast from inconel 713 or inconel 718, the same  expensive, exotic nickel-chromium alloy that is used in a many full sized turbine engines. Inconel 718 offers outstanding  resistance to heat, oxidation and thermal fatigue up to temperature of 1000 degree Celsius. The exhaust gas temperature can reach up to 750 – 850 degree Celsius. Turbine disk has a many blades which produces tangential force which rotates the turbine.                                                                                                                                                                                                                                                                   In the combustion chamber fuel is mixed with air to produce the bang, which is responsible for the expansion , that forces the air in to the turbines the combustion chamber has a difficult task of burning large quantities of fuel with extensive volume of air. One of the most important part of the gas turbine engine is nozzle guide vanes- increases the velocity of the exhaust gaseous. The gaseous expand through the exhaust nozzle producing a high velocity jet. In a convergent nozzle, the ducting narrows progressively to a throat the nozzle pressure ratio on a turbojet is high enough at higher setting to cause the nozzle to choke. This section allows the gaseous to reach supersonic velocity within the divergent section . Additional thrust is generated by the higher resulting exhaust velocity.                                                                                                                                                                                                                                                                                                                                                                                                   

Model turbine engine is widely use in amateur and professional radio controlled airplanes and helicopters having high thrust to weight ratio. Model turbine engine comes with different packages or say different thrust capacity, ranging from normally - 80N, 100N, 120N, 150N, 200N, 220N, 225N, 320N, 400N.  And so on.                                                                                                                                                                                                                                                                                                   We now see some of the model gas turbine or RC micro or small Mini micro jet turbine engine manufacturer.                          1)  Jetcat turbine.                                                                                                                                                                                      2)  Jet central turbines.                                                                                                                                                                             3)  Jet munt.                                                                                                                                                                                               4)  king tech turbines.                                                                                                                                                                               5)  xicoy turbines.                                                                                                                                                                                       6)  behotec gmbh.                                                                                                                                                                                     7)  turbine power solutions.                                                                                                                                                                      8)  Swiwin turbines.

In Indian market there was a huge gap in terms of availability of rc model micro  turbine engines for  hobbyist and professional aero scale model  sport, because of the high cost of the model  gas turbine engines manufactured in out of India.                                                                                                                                                                                                             For instance now in India there are some Indian manufacturers of micro gas turbine engines which is primarily  use for unmanned aerial vehicles, missiles, and drones.  We now see some of the model gas turbine or RC micro or small Mini micro jet turbine engine manufacturer in india.                                                                                                                                           1) Raghu vamsi machines tools (Indra RV-25)  - 250N Thrust.                                                                                                             2) DG propulsion.  - 400N thrust.

INDRA RV-25

DG PROPULTION. DG-4O

  Now you can build your own RC scaled jet turbine plane and follow your passion.                                                                      Let us know your emotions by your words by commenting on this blog , and share your thoughts on what do you think  about model micro turbine engines, comment below.