My first attempt at making a self-sustaining pulsejet was a failure. Not wanting to give up I started my second attempt. I read a lot of literature on pulsejet and browsed through relevant topics at the pulsejet forums (www.pulse-jets.com). I learnt that small pulsejets are difficult to operate. So, I decided to make my pulsejet a little bit larger. 

The picture below shows my  second pulsejet I constructed. Its looking muscular.. isn't it?

Its a coincidence that the dimensions of my pulsejet closely matched the Bailey pulsejet. By the way, Bailey jet is a well proven design. Here is the plan for the Bailey pulsejet.

This time I selected all the components of the jet in stainless steel. I made the petal valves out of spring steel sheet and I cut the shape using a rotary dremel. The fuel nozzle is the challenging part in the build. I got few nozzles used for pneumatic controls and managed to make a fuel nozzle for the jet. You can see that as a golden colored brass fitting on the front of the jet.

After finishing the build, out of temptation, I tried starting up the pulsejet. I rigged up the jet in my bench vice and gave an air blast at the intake using a vacuum cleaner. The spark was ON, fuel is spraying in the venturi but there was no sign of firing.

Not wanting to give up, I wetted the combustion chamber with fuel and gave another try... Man! without any warning the jet STARTED UP!!!...  The noise was not so loud, it was rather like a growling sound and a bit husky. It sounded more like dragging a big plastic tank on ground. May be the fuel was too rich.

I felt that the air intake issue that I faced in the first pulsejet build is also there in the second version. I then made a couple of venturi adapters  so that I could do some trial/error tests to start the jet engine.

Finally, I was able to start the engine and it ran consistently for about a couple of minutes. Here is the video of the engine starting and normal run of the Mark2 pulsejet.

The Mark2 pulsejet project was a marvelous success. I should say that I am very pleased with this jet engine. I thought of making a delta wing aircraft for this pulsejet. However, I have to abandon the project as the jet engine itself was weighing a whooping 1.7Kg. Further, my professional life changed such that I need to relocate. So, as of now, this would be my last aeromodelling project. I wish I restart aeromodelling sometime in near future.