Search found 15 matches

by tritile
Fri Sep 05, 2014 1:38 pm
Forum: Valved pulsejet forum
Topic: Warm engine hard to start
Replies: 13
Views: 4970

Re: Warm engine hard to start

But it is exactly the same size of dynajet retainer
by tritile
Fri Sep 05, 2014 1:35 pm
Forum: Valved pulsejet forum
Topic: Warm engine hard to start
Replies: 13
Views: 4970

Re: Warm engine hard to start

Hum... it makes sense
by tritile
Thu Nov 21, 2013 1:10 am
Forum: Valved pulsejet forum
Topic: Lopsided spraybar
Replies: 1
Views: 1624

Lopsided spraybar

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...
by tritile
Sun Nov 17, 2013 9:15 pm
Forum: Valved pulsejet forum
Topic: Warm engine hard to start
Replies: 13
Views: 4970

Re: Warm engine hard to start

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...
by tritile
Thu Nov 14, 2013 6:53 pm
Forum: Valved pulsejet forum
Topic: Warm engine hard to start
Replies: 13
Views: 4970

Re: Warm engine hard to start

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.
by tritile
Thu Nov 14, 2013 6:30 pm
Forum: Valved pulsejet forum
Topic: Warm engine hard to start
Replies: 13
Views: 4970

Re: Warm engine hard to start

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...
by tritile
Thu Nov 14, 2013 5:22 pm
Forum: Valved pulsejet forum
Topic: Warm engine hard to start
Replies: 13
Views: 4970

Re: Warm engine hard to start

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...
by tritile
Thu Nov 14, 2013 5:12 pm
Forum: Valved pulsejet forum
Topic: Warm engine hard to start
Replies: 13
Views: 4970

Re: Warm engine hard to start

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...
by tritile
Thu Nov 14, 2013 12:16 am
Forum: Valved pulsejet forum
Topic: Warm engine hard to start
Replies: 13
Views: 4970

Re: Warm engine hard to start

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...
by tritile
Wed Nov 13, 2013 4:19 pm
Forum: Valved pulsejet forum
Topic: Warm engine hard to start
Replies: 13
Views: 4970

Warm engine hard to start

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...
by tritile
Fri Aug 30, 2013 3:16 pm
Forum: Valved pulsejet forum
Topic: dynamic modeling of a strip valve
Replies: 144
Views: 2857007

Re: dynamic modeling of a strip valve

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?
by tritile
Fri Aug 30, 2013 3:11 pm
Forum: Valved pulsejet forum
Topic: dynamic modeling of a strip valve
Replies: 144
Views: 2857007

Re: dynamic modeling of a strip valve

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.
by tritile
Thu Aug 29, 2013 2:35 pm
Forum: Valved pulsejet forum
Topic: dynamic modeling of a strip valve
Replies: 144
Views: 2857007

Re: dynamic modeling of a strip valve

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.
by tritile
Fri Feb 04, 2011 12:49 am
Forum: Valved pulsejet forum
Topic: dynamic modeling of a strip valve
Replies: 144
Views: 2857007

Re: dynamic modeling of a strip valve

oh, man!

we lost all the pictures of this topic =/
by tritile
Thu Nov 20, 2008 3:17 pm
Forum: Valved pulsejet forum
Topic: C.E Tharratt "propulsive duct Part 2" Scanned..
Replies: 3
Views: 3701

Re: C.E Tharratt "propulsive duct Part 2" Scanned..

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...