Search found 4930 matches

by Mike Everman
Sat Jul 29, 2017 3:39 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 121796

Re: Mike's Build Log

Ha, dude, I love that picture. I see you've taken over the dining room table.
It's the "where's waldo" of pulsating combustion.
Thanks again for the toy loan. Going fishing for the week at 9,600 feet or I'd bring them along!
by Mike Everman
Fri Jul 28, 2017 8:33 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 121796

Re: Mike's Build Log

Fan mail from some flounder?

The famous resonanttheme snorkelers are in the hizouse! But I can't play with them until the 7th!

https://www.dropbox.com/s/43mqyl4men7sb ... 6.jpg?dl=0
by Mike Everman
Mon Jul 24, 2017 10:50 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 121796

Re: Mike's Build Log

Mark wrote:I mailed three little bottles to you this morning Mike that should arrive in a couple of days from snorkelville. snip Happy snorkeling!
Thanks for everything, Mark!! I'll be gone a lot this coming month, but will definitely play.
by Mike Everman
Mon Jul 24, 2017 5:30 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 121796

Re: Mike's Build Log

I like it! clearly a measure for the spinny pot. I wonder if some concentric baffles on the bottom might make a normal static pot behave better. I'll do a slo mo of one of my glass post and see how turbulent the liquid in the bottom is. Just getting a spinny pot going is a real hurdle! i hope we can...
by Mike Everman
Mon Jul 24, 2017 2:30 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 121796

Re: Mike's Build Log

But if it were easy it wouldn't be special. True that! Thanks for the reminder about trying non vertical orientations. I've gone through almost a 12 pack of silver bullet so far, and now finally some light at the end of the tunnel. New fuel, and putting a .53 inch hole in the bottom and running hor...
by Mike Everman
Sun Jul 23, 2017 3:55 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 121796

Re: Mike's Build Log

https://youtu.be/LRFPkJVMt1M

The bark in slow motion. Very interesting things if you go frame by frame. A little butane ball of fire at the end.
by Mike Everman
Sun Jul 23, 2017 2:44 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 121796

Re: Mike's Build Log

Yeah, that candle in a tube sets up what they call a thermal syphon used in some geothermal systems. The mind boggles at air going in one and out the other at the same time, which is certainly the case on the parent motor. Maybe its where this idea breaks down, as I just dont have enough volume to b...
by Mike Everman
Sun Jul 23, 2017 4:53 am
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 121796

Re: Mike's Build Log

Yes, augmenters weight heavily in my plan. That should be interesting. Any way you slice it, noisier means more thrust. I just took a first step toward a closed end version of my pocket jet. Twin snorkels for you, Mark. ha It's tough (or maybe impossible) to make it acoustically identical to it's va...
by Mike Everman
Sat Jul 22, 2017 3:14 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 121796

Re: Mike's Build Log

Cool, Mark, I'd love to do some experiments with with one of your snorkelers! I've got a new massive spreadsheet developing for pulsating combustor design. I've been getting cold and hot frequency measurements and matching them with theory. One of the interesting conclusions is, for my family of poc...
by Mike Everman
Sat Jul 22, 2017 12:02 am
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 121796

Re: Mike's Build Log

The more I think on it, I think spinning the pot is bad. The incoming jet(we think) should be making a nice, doughnutty vortex in there. As soon as you try to spin the pot, I can imagine this inside out circular flow will precess and go chaotic and turbulent. Surely it's turbulent when it combusts, ...
by Mike Everman
Fri Jul 21, 2017 7:24 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 121796

Re: Mike's Build Log

Ha, I'm 3d printing an hourglass shape right now for another project. I think a reynst pot might not need the venturi ring inside if it were wasp-waisted. I'm starting to lean toward not spinning the pot, but too early to tell...
by Mike Everman
Wed Jul 19, 2017 8:06 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 121796

Re: Mike's Build Log

Yep, Well, two .36" holes runs for a few seconds but not super strong. wonder if I want a wall in there to keep the streams from hitting each other on the inside. I'm hit and miss on my benchmark 12 oz salsa bottle with .52" single hole running. humidity is all over the place, runs in the morning bu...
by Mike Everman
Sun Jul 16, 2017 5:39 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 121796

Re: Mike's Build Log

Yeah, jostling is bad. I also need to protect my jets from the sideways slipstream, so i expect either some right angle snorkels or just a diverter sweep. The coors light aluminum bottle is pretty good, flattish bottom, short neck, screw cap. The shoulder is about 35deg from vertical. I wonder if i ...
by Mike Everman
Sun Jul 16, 2017 12:12 am
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 121796

Re: Mike's Build Log

My thoughts too. Here's another try with rounder, but still tangential exits. I can get a brrrr, but thats all:
https://www.youtube.com/watch?v=WkxUnm0thwA&sns=em
Going to go look for likely candidates with more of a neck down. Perhaps they will be beerish.
by Mike Everman
Sat Jul 15, 2017 9:20 pm
Forum: Jet Vehicles, All Types
Topic: Jam Jar Car Fun
Replies: 22
Views: 8129

Re: Jam Jar Car Fun

A little better rig, trying for a torque motor:
https://www.youtube.com/watch?v=WkxUnm0thwA&sns=em
Fuel sloshes up,but is fortunately not on fire when it does the rainbird