An amateur turbine maker with a homemade turbojet engine

An ordinary lathe.

Electric welding of stainless steel is possible.

Electric drill. Since the detailed design and production process is as much as an 80-page book, the following is just a summary of the contents of the book!!

1.Turbine. The length of the blades of the turbine is about 1 6 of the outer meridian, (for amateurs do not ask why), because it is the data of numerous experiments of the author.

The turbine cannot be drilled, and the number of blades is designed to be 17.

When the temperature drops from 500 degrees to 20 degrees, the gap between the turbine and the casing will be reduced by 5%, which means that the design should reserve space for the turbine to expand, which is too large. There is no thrust. The turbine is made of high-temperature resistant stainless steel shear and bent.

2.Axis. High speed and low torque, must be very hard, otherwise it will be 60,000 rpm, the resonance of the game is finished, the engine is made of aluminum alloy to help heat dissipation, and the two ends are stainless steel.

Bearings should have a high speed, up to 90,000 rpm. Use lubricating oil to cool down, which can be replaced with 688, which is found daily.

3.Compressed impeller.

The material is aviation laminate, or strong wood such as beech. Reinforced with carbon fiber.

4.Turbine dynamic balancing.

See Vortex Homemade Q&A).

5.Processing data.

Handmade version of KJ66.

A production suitable for Chinese lovers to refer to).

Diameter: 110mm

Length: 235mm

Maximum thrust: 5kg

Maximum speed: 103,000rpm

Exhaust temperature: 550 deg c

Net weight design is KJ66 handmade version, foreign enthusiasts self-reliance, except for the compressor wheel using car accessories compressor wheel, the rest are all handmade,,, the above is KJ66 handmade products.

Personal experience for the reference of enthusiasts).

For domestic enthusiasts to make their own turbojet, according to my production experience, I personally think that after having a certain understanding of the processing design principle of FD3-64, making KJ66 (manual version) is a more suitable choice, because the following transformation is enough to make you feel tempted.

1.Compressor wheels.

The new design uses KKK series aluminum alloy compressor wheels for turbochargers. It can be purchased at major auto parts stores.

Provide some information for homemade turbojet enthusiasts**, I hope it can be useful to your homemade turbojet.

Primitive vortex decomposition.

KJ66 vortex jet decomposition.

Automobile exhaust gas booster decomposition.

Vortex jet decomposition made with an automobile exhaust gas supercharger.

Vortex decomposition of the finished product.

What is the name of that book, thank you.

Don't talk nonsense if you don't understand, first of all, stainless steel is completely capable of these things! For turbines and centrifugal impellers, you can use the finished product in the turbocharger! In addition, any engine in the world has a limit on the temperature of the turbine front gas, which means that the combustion chamber is not to achieve complete combustion, and the high temperature generated by this is not something that metal or anything can bear!

As I said, although tungsten has a high melting point, it is not very strong. In fact, tungsten is not used at all!

1.Components: subsonic intake pipe (flared), booster impeller, diffuser, bearing, bushing, guide, turbine, tail nozzle, .......

2.Production process:

Understand the machinery should know what I am talking about, the main machines are: four-axis four-linkage milling, number of cars, runout table test, vacuum dynamic balance .......

3.Debugging process: It is best to use PLC configuration control, if the conditions are limited, at least measure the speed, pressure, fuel consumption, thrust .......

It may be a little difficult for non-professionals to look at it.

If you want to do it alone, you need to learn the following subjects: mechanical design, mechanical drawing, mechanics of materials, fluid mechanics, CNC programming, PLC (preferably Siemens), configuration, and microcontroller.

The aeronautical design major is struggling with this thing. This requires strong technical support from specialized disciplines.

As a prototype of self-made turbojet, maybe now when you plan to make your own turbojet, you don't need to choose to make FD3-64, because it is a product of 98 years after all, and now foreign enthusiasts have improved the design, and the self-made turbojet has reached 12 kg of thrust. The thrust-to-weight ratio is about 10. But don't think it's outdated and useless, because the production theory of FD3-64 allows you to build a turbojet at home.

In reality, there is no need to worry about the lack of special equipment in an aero-engine factory, because you can find the corresponding materials to process in daily life. At the same time, the author broke the idea of superstitious professional manufacturers, used his own brains, and in the words of the Chinese, he tried all local methods to make a jet engine that can be used in model aircraft under the guidance of scientific theory. His success has also encouraged more enthusiasts to participate in the research and fever ranks of homemade vortex, which has greatly improved the thrust of self-made vortex, which is a challenge and exercise.

At the same time, we can also refer to the process of making and processing parts of FD3-64, and dare to improve the processing method according to our own conditions and under the guidance of scientific theory. But the FD3-64 is an outdated design after all, its wood compressor wheel needs to be reinforced with carbon fiber, plus the efficiency is not high, therefore, the later improvement uses the KKK series or Gellert commodity compressor wheel parts, which can be purchased in slightly larger auto parts stores.

FD3 46 Turbojet Engine Manufacturing Method - Excerpt.

We would like to thank the "Oriental Spider" for their strong support.

Original: Kurt Shreckling

Excerpt from "Gas Turbine Engine for Model Aircraft".

The book is called 'Model Jet Engine' by Thomas Kamps, who doesn't know what edition it has been in. It is an introduction to the production method of a micro turbojet engine.

The books are in English. Probably sells for 350

Fabricate? Forget it, you better buy the finished product directly, just buy the equipment used in the manufacturing can buy the Airbus A380.

It's harder. First, you have to understand the structure of this engine yourself.

Second, how big of an engine are you going to make?

Third, the pump can be centrifugal type, not axial flow type, axial flow type is quiet design and manufacturing requirements are very high, and the speed is much higher than that of centrifugal type to achieve the same pressure.

Fourth, if you want to make the old scum structure, then the starter can be directly connected to the shaft of the compressor with an electric motor, and then moved away after starting. The lubricating oil can be supplied with an electric oil pump, and the oil pump is not driven by the power of the engine, and similarly, the fuel pump is also electric. Of course, this is only a scheme for thrust engines.

If it is used for general engines, then as long as the shaft of the engine is lengthened, output in front, and then decelerate with a reducer.

Fifth, the turbine of the engine should be resistant to high temperatures. General steel is not good, and the design and processing of turbines are also very laborious. It directly affects the engine output power.

Sixth, it is better not to use gasoline for fuel. Because it is homemade, gasoline is not safe enough. Diesel or kerosene can be used.

Seventh, the combustion chamber should be made of high-temperature resistant materials.

8. The bearing should be kept as far away from the combustion chamber as possible. And use high-temperature bearings.

For the rest of the stuff, let's take a good look at the book.

It is recommended not to make yourself, the steel is not up to standard, and the centrifugal force will produce **, and the power is not inferior to that of a grenade.

The main parts of the production of turbojet are: casing, stator, rotor, combustion chamber.

Combustion: Cylindrical combustion chamber that needs to be welded and drilled.

Stator: Turning and milling blades, welded to the stator profile, stator welded to the casing Rotor: Turning and milling blades and discs and shafts, welding.

The casing is mainly a shell, and a load-bearing structure. Thin steel plates with temperature resistance points can be used, and the fitter shears, bends, and welds after forming.

To put it simply, these things are too detailed to say. Turning, milling, welding, drilling, and fitters can basically meet the demand.

However, it is difficult to say whether the things made by non-professional individuals can be turned, even if they are turned up, it is difficult to ensure safety, this thing is still dangerous, if the processing capacity is not good, even if it can be turned, the blade may break and throw out after driving to a certain speed, which is similar to the power of bullets, and the whole machine will be scrapped directly if it is not thrown out if it is lucky. There is also the problem of usable life, the working time of the vortex made by non-professionals is unpredictable, it is possible to drive the machine for 5 minutes and it will be scrapped, the small machine can not be cooled, and the micro vortex made by professional manufacturers will stop for cooling for half an hour, otherwise the machine will burn out.

The self-made turbojet engine engine has simple structure, easy processing, and has higher combustion efficiency than ordinary internal combustion engine engine, so it is suitable for all kinds of aviation, sea model, and vehicle mold.