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But it is exactly the same size of dynajet retainer

Hum... it makes sense

Hi, I built a valved engine with lopsided fuel spraybar. It means that the spraybar is perpendicularly inserted in the throat section of air intake. In my case, for convenience, the spraybar is directly connected to a needle valve responsible for controlling the mixture ratio. 20110321_120540.jpg Th...

Hi, … Coming back to report the results: Well, I run the engine for a couple of more minutes and what I noticed was an engine more unstable to start and to run. By the petals cooling point of view, I got very interesting results. Looking the color of the petals it is possible to see what petals were...

So I cut off a piece of the spray bar according the patterns I saw during tests this morning.

Tomorrow I’ll try to test it again and then come back here to tell what happened.

Thanks.

When I look closely to air intake I see a pattern of fuel similar to the one in the first picture. I believe this is why there is an asymmetry in petals breaking. It was supposed to be a pattern like the one in the second picture. The spray bar is too much in the center, so I believe the solution wo...

Take a look at these valves. They were used when the valve plate was with tenths of fissures (I already fixed it). This is why they are so damaged. But, in any case the behavior still exists in lower level and you can see that the petals have tendencies to break up tips in only one side (the upper s...

Hi! Thank you for the reply! I think I was a victim of the circumstance. I’ve leaded a long series of tests and so many changes that I got lost among the global estate of the engine. I’ll list down some point that may help others: 1 :: My valve plate is made by aluminum alloy. This seems to be a gre...

Hi, This is one good point, Metiz. Due to the several tests a performed with this engine, the valve plate begun to be eroded by the petals. At the worst point the valve’s life was not more than 30 seconds. Much lower than the first tests when it was about 30 minutes. So I used a plain table, a coupl...

Hi, I made an engine based on dynajet plans. It has the same main dimensions, but some constructive details were changed in order to make it cheaper to manufacture. All it body and tail were made from standard tubes, so, it has a really thick wall. The valve plate was made from a hard aluminum alloy...

Mike, I can't see the e-mail icon you say. I don't know if it is something in my browser or what. Could you send me his address by private message?

I'm ready to help somehow if he ever need. Unfortunately I believe that only he can edit the old posts and add the pictures. I'll send him an e-mail.

Does anyone have webpilot's e-mail address? I'd like to ask him if he still has the pictures of this topic. Links are no longer working, and I believe they are pretty important. This topic is one of the most significant in the whole forum.

oh, man!

we lost all the pictures of this topic =/

Hi! My name is Bruno, I make researches about pulse-jets since I was 16 years old, and this forum always helped me. I'm writing the final project of my course of Mechanical Engineering, and of course, the theme of my final project is Pulsejet engines. I downloaded the Tharratt's article in this page...