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by Mike Everman
Mon Aug 21, 2017 2:18 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 364
Views: 95779

Re: Mike's Build Log

Great! I'll redesign on my trip for a full jacket, including water cooling of the "vortexifier".
by Mike Everman
Mon Aug 21, 2017 2:12 am
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 364
Views: 95779

Re: Mike's Build Log

Last PLAJET experiment before I have to take a couple of weeks off of this fun project!
http://www.youtube.com/watch?v=eVyjyci_NG8
by Mike Everman
Fri Aug 18, 2017 3:44 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1715
Views: 278263

Re: Odds and ends

Well, you could obviate the thermal mismatches by using lap butt joints between metal plates and ends of tubes. "(details)" You are a crucible, a plate and two quartz tubes from a thermo-jet style. I can figure starting dims for you, based on crucible size. If you have one that hovers around 2:1, L:...
by Mike Everman
Thu Aug 17, 2017 1:54 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1715
Views: 278263

Re: Odds and ends

It looked so promising!
by Mike Everman
Thu Aug 17, 2017 1:45 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 364
Views: 95779

Re: Mike's Build Log

Methanol. Hah, I didn't know desiccant is termed a molecular sieve. What I don't know about chemistry would fill a large chemistry book! I am very keen on going to the bronze foundry. You know you can 3D print PLA and cast just like lost wax? Local art prof is doing that here in Santa Barbara. We sh...
by Mike Everman
Thu Aug 17, 2017 5:30 am
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 364
Views: 95779

Re: Mike's Build Log

A look inside the melted PLA Pulser. Who knows when the Vortexifier inside slagged. It did get progressively more stable until the walls got soft. This great running one has a 9mm hole. The next one I tried started at 8mm, and I then opened it up 1/64" at a time and never got a good run. Hmmm. Eithe...
by Mike Everman
Wed Aug 16, 2017 7:08 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 364
Views: 95779

Re: Mike's Build Log

Ha! Hi Simon. just trying to break new ground and got caught up in it!
by Mike Everman
Wed Aug 16, 2017 2:05 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1715
Views: 278263

Re: Odds and ends

"The intelligent look". Bwa ha ha
by Mike Everman
Wed Aug 16, 2017 2:01 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 364
Views: 95779

Re: Mike's Build Log

Omg, the balloon jacket idea is brilliant, but I don't know how yet. Going to let the hind brain chew on that today. Seems a neat way to get variable volume, if we can stand all that roundness. I printed another with an 8mm hole (previous 9) and it won't jam. Drilled it out in steps up to .375", sti...
by Mike Everman
Tue Aug 15, 2017 11:12 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 364
Views: 95779

Re: Mike's Build Log

I wonder if a little water bath just on the lower half would make it go a long time. I mean, we know it does, but I'm not seeing any material movement up top where you'd think it would melt. Just the super heating at the bottom of the flamy pyramid, where it touches the walls.
by Mike Everman
Tue Aug 15, 2017 5:57 am
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 364
Views: 95779

Re: Mike's Build Log

Just ran the rapid proto pot to slagginess.

http://www.youtube.com/watch?v=MYlEjTYcJ2Y
by Mike Everman
Mon Aug 14, 2017 11:47 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 364
Views: 95779

Re: Mike's Build Log

Not sure I'd call it a rectifier as much as a vortexifier. ha Also thinking about your SiO2 crucible one, where the hole is just longer than it is in diameter. Now that, and like snorkels in general, are rectifiers. That's the next test, adding a smidge of length there. Maybe get rid of the flare on...
by Mike Everman
Mon Aug 14, 2017 5:56 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 364
Views: 95779

Re: Mike's Build Log

So, this one is 57mm ID, 110 length, with a 9mm hole. Reynst had a movable bottom on his ultimate device, so starting was at a longer/higher volume state, and moved to shorter. I'm printing one with an 8mm hole to try tonight. Then maybe the midnight design effort will be a water jacket. I'm really ...
by Mike Everman
Mon Aug 14, 2017 3:47 am
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 364
Views: 95779

Re: Mike's Build Log

It works well! Another failed print out of ABS (settings need tweaking); switched back to the lower temp PLA and a perfect print. Here's a short video. notional printed reynst, small.mp4 Cold frequency is 282 Hz, running frequency is 82 Hz If I let it go a few seconds too long, it gets warpy down ne...
by Mike Everman
Sat Aug 12, 2017 4:47 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 364
Views: 95779

Re: Mike's Build Log

I think definitely Reynst is on board with this model, ha. He was about breathing more than thrust. This is just a printing demonstrator with completely notional geometry I can hold in my hand. Most of the "design for 3d printing on cheap printers" has to do with eliminating support material, which ...