Search found 1743 matches

by PyroJoe
Fri May 31, 2013 1:48 pm
Forum: Valveless pulsejet forum
Topic: M500 build log
Replies: 161
Views: 51286

Re: M500 build log

"And those are placed inside the intake? One problem I can see happening is the the fuel exits the holes in a laminar fashion" The spray bar is probably good for fluids of low density that have viscosity properties that allow it to break up the laminar flow immediately after exiting. Alcohols appear...
by PyroJoe
Mon May 20, 2013 1:30 pm
Forum: Valveless pulsejet forum
Topic: M500 build log
Replies: 161
Views: 51286

Re: M500 build log

It is a simple tube drilled with holes. Attached is the one that Keith posted. Throttle is varied by changing the applied fuel pressure. Smaller holes allow it to maintain spray at lower pressures. The problem with smaller holes is they tend to clog easily. The pattern the holes are drilled can fan ...
by PyroJoe
Fri May 17, 2013 9:52 pm
Forum: Valveless pulsejet forum
Topic: M500 build log
Replies: 161
Views: 51286

Re: M500 build log

I'm thinking spray bar similar to what Keith Mcconnell did with his spray bar. I have purchased a small drill that can be used with precision. Pen Drills. They have some very small sized drill bits. Once you have your pump you can test the flow rate in a bucket and slowly add more holes to bring it ...
by PyroJoe
Fri May 17, 2013 3:58 pm
Forum: Valveless pulsejet forum
Topic: Lockwood Pulse Jet won't sustain
Replies: 31
Views: 8561

Re: Lockwood Pulse Jet won't sustain

congratulations! :D
by PyroJoe
Fri May 17, 2013 3:43 pm
Forum: Valveless pulsejet forum
Topic: M500 build log
Replies: 161
Views: 51286

Re: M500 build log

What is the pressure your pump can sustain at 3.3 L/min. ?
by PyroJoe
Thu May 16, 2013 5:54 pm
Forum: Valved pulsejet forum
Topic: Dyna-Jet book
Replies: 12
Views: 3946

Re: Dyna-Jet book

Jerry,
Where do we order your books from?
by PyroJoe
Thu May 16, 2013 5:48 pm
Forum: Valved pulsejet forum
Topic: Planing for next years speed weekend, (1/2 scale Argus)
Replies: 111
Views: 49701

Re: Planing for next years speed weekend, (1/2 scale Argus)

Good job at Orsa. I know you are looking to decrease the weight of the vehicle and make it more aerodynamic. Make sure to keep your center of gravity low as you shave the weight.
by PyroJoe
Thu May 16, 2013 5:38 pm
Forum: Valveless pulsejet forum
Topic: M500 build log
Replies: 161
Views: 51286

Re: M500 build log

Any updates?
by PyroJoe
Thu May 16, 2013 5:33 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1715
Views: 319702

Re: Odds and ends

Nice work, these latest ones have been awesome. Did that last one run out of fuel?
by PyroJoe
Thu May 10, 2012 6:17 pm
Forum: Tools and Construction
Topic: Cutting noise
Replies: 37
Views: 11601

Re: Cutting noise

Ed Zachary? Is that really where you want to go with this?
Good god we're at cancelling again? I give thanks to Viv for leading me to water. And to M, I get it now.
by PyroJoe
Thu May 10, 2012 3:44 pm
Forum: Tools and Construction
Topic: Cutting noise
Replies: 37
Views: 11601

Re: Cutting noise

A question presents itself, if 0 psi overpressure is achieved, is anything reflected at the tailpipe opening?
by PyroJoe
Thu May 10, 2012 2:20 pm
Forum: Valveless pulsejet forum
Topic: PulseJet starting problem
Replies: 4
Views: 2558

Re: PulseJet starting problem

What are the current dimensions? Are they the same as before?
by PyroJoe
Thu May 10, 2012 1:28 pm
Forum: Tools and Construction
Topic: Cutting noise
Replies: 37
Views: 11601

Re: Cutting noise

The more I look at it, it appears it could benefit from the head pressure from motion, that could give the fresh air load a couple extra pounds. Also a long CC would allow a higher fill ratio of fresh air up front in that area. The flame travel would shift deeper in the engine, and some drift veloci...
by PyroJoe
Wed May 09, 2012 8:58 pm
Forum: Tools and Construction
Topic: Cutting noise
Replies: 37
Views: 11601

Re: Cutting noise

I may have missed something. If thats supposed to be a spring, I see it as subordinate to the CC pressure, which makes the spring loaded from the CC gas as thats the most significant pressure source. If it is to work as a fresh air spring, that would require the spring to be loaded with fresh air to...