Making a pulsejet that runs on any aerosol

Firstly, I used an open tin can for the combustion chamber. The tin can was cleaned thoroughly before use, and allowed to dry.

Then two metal tubes were used as an exhaust and inlet. The larger tube, with an approximate diameter of 3.7cm, will act as the exhaust pipe. The smaller tube, with a diameter of 1.9cm will act as an inlet. 

Next a fuel system must be made. Below is the plan I used to convert 1/4' flexible tubing to 8mm copper pipe. My only supplier of plumbing parts is Screwfix and I could not find a straight adaptor, so multiple adaptors were used to convert the tubing to 8mm, and to accommodate a ball valve.

Below is the plan in real life, made with the parts listed above.

Next, it is important to crimp the end of the 8mm pipe. This allows for a faster velocity of the fuel entering the combustion chamber. Faster gases have lower pressure, so the Bernoulli effect is amplified.

The faster gas effectively sucks in more air, allowing the pulsejet to run more efficiently. 

For a final personal addition, to allow this engine to run on almost any aerosol, I bought an adaptor online which clips onto the head of spray cans. This then sends high pressure flammable gas to the 1/4' tubing.

Adaptor part 1

Adaptor part 2

Now that the fuel system is over, we can return back to the body of the pulsejet.

Two holes can be drilled in the top of the pulsejet to fit both pipes. They can then be fitted in. One method of ensuring durability is to flare the end of the exhaust pipe. Then feed it in back to front. The flare will push the intake into the side of the can and will make the structure more rigid. Then a hose clamp can be used to make sure the pipes do not slip into the combustion chamber.

The product in real life looks like this:

Next, to seal the end of the can, we can use the lid of it. I do not own a spot welder, or brazing kit, so I cannot use those methods for connection. However, I do own metal tape (aluminium tape) that can be bought cheaply almost anywhere. I used this to seal the end of the can back on. 

Before the sealing:

After the sealing:

If you do have a welder, I suggest you use that instead of the method used above, as it is infinitely more durable and much easier.

You should see the shape of the pulsejet form now:

Finally, the fuel line is connected. Make sure a generous portion of the 8mm line runs along the exhaust, as when the exhaust gets hot, the fuel will be preheated before it enters the combustion chamber, making it a lot more flammable.

The final product looks like this: