Step 8: Touching Up
The fire of excitement that had sparked in me earlier was now roaring with an uncontrollable yearning to run the engine. It looked like it should work, and was calling me to start it and propel myself at high speeds down the pavement, cherishing those strange looks from my neighbors as signs of a job well done. But lo, I wasn't finished yet, and I pressed on evermore through the night.
Now, for the most part the job is done, except for some tweaking. I did spend a ton of time tweaking. Some tweaks I had to do are as follows:
- Add on the front cap on with electrical tape, I had to be able to move it around a bit, to get my fan to fit in.
- Bend and trim the front fan so that it would spin freely.
- Mess around with the fuel system a bunch.
- Add a small piece of plexiglass to the front of the shaft to keep the shaft in place.
Remove these ads by
Signing Up
Visit Our Store »
Go Pro Today »
since we need to connect two fans(one intake & one outlet) with same axial shaft considering it opposite going fan blades might be the problem
(clock wise rotation of fan shaft will result in inlet fan puloing air in side combustion chamber and outlet fan's blade also pulling air in)
so u try to keep both fans blade in same direction. and then have a samll test with any fuel u like...
1. have you tried running the jet yet? what fuel did you use?
2. what compression ratio did you use in the compression chamber?
First off, the design for the combustion chamber is off slightly. The combustion chamber should be a round ring with a tapered front and rear. Fuel should be pumped into a ring by a piece of copper tubing with minute holes for atomizers. To create symmetry, consider running 2 fuel lines to the fuel ring noted above. This should be surrounded on both sides by the combustion chamber, which will have holes in the sides to allow the compressed air mixture to enter. The bottom of this should also be open to allow compressed gas to escape.
On compression, I have heard numbers tossed left and right. However, a range between 10 and 15 to 1 is common. To do this, use some aluminum (from cans or other sources) to create a cone that starts near the first compressor disc at the same diameter as the inside of the can, and taper it back to make the compression ratio, This is not very hard to do. Basically, before the engine reaches the combustion chambers, the air has to be compressed to this specific density. This isn't too hard, as the combustion chamber itself can aid the process.
Another tip would be to have a way to inject water into the engine, somewhere before the combustion chamber. If you do this, you can inject water for both a parts cool down and burn increase. However, another tip is to use a pump to inject oil around the shaft of the blades, and around the bearings. These bearings will heat up, so keeping them cool will extend the life of the jet.
Finally, a word of caution. To start a jet engine, an air compressor or leaf blower is used to blow the compressor blades to begin ignition. If your blades are not balanced, the blades can wobble, and then explode. The rpm's required are very high, sometimes into the tens to hundreds of thousands, so be cautious.