Search found 4905 matches

by Mike Everman
Fri Jul 21, 2017 7:24 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 364
Views: 93865

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: 364
Views: 93865

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: 364
Views: 93865

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: 364
Views: 93865

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: 5338

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
by Mike Everman
Sat Jul 15, 2017 4:52 pm
Forum: Jet Vehicles, All Types
Topic: Jam Jar Car Fun
Replies: 22
Views: 5338

Re: Jam Jar Car Fun

I just posted a pajama science video of a soda can heli try on my build log.
by Mike Everman
Sat Jul 15, 2017 4:48 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 364
Views: 93865

Re: Mike's Build Log

Been a long time since I've been here and obsessing about jam jars!
Trying to make a jam jar helicopter toy:

https://www.youtube.com/watch?v=mXgAOvkrOF4&sns=em
by Mike Everman
Sat Jul 15, 2017 4:48 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 364
Views: 93865

Re: Mike's Build Log

Been a long time since I've been here and obsessing about jam jars!
Trying to make a jam jar helicopter toy:

https://www.youtube.com/watch?v=mXgAOvkrOF4&sns=em
by Mike Everman
Sat Jul 15, 2017 2:35 pm
Forum: Jet Vehicles, All Types
Topic: Jam Jar Car Fun
Replies: 22
Views: 5338

Re: Jam Jar Car Fun

I'm thinking beer can with tangential jet exits or a diverter to make it spin, and fix some superlight rotors to that. Sit it on a bearing so it can get up some spin before lifting off. Theres the issue of being a burning fuel sprinkler, though.
by Mike Everman
Fri Jul 14, 2017 5:24 pm
Forum: Valveless pulsejet forum
Topic: Cant start pulse jet
Replies: 6
Views: 889

Re: Cant start pulse jet

Lengths and area ratios must be in a range, intake almost always needs a flared inlet. When using a leafblower, farther away from the intake is best. wave back and forth in various amounts of dead-on. It may be just the little fringe of the blower stream going in from a foot away. When you push it r...
by Mike Everman
Fri Jul 14, 2017 5:00 pm
Forum: Jet Vehicles, All Types
Topic: Jam Jar Car Fun
Replies: 22
Views: 5338

Re: Jam Jar Car Fun

Yeah, that is fun. And seriously, we need to do a jamjar helicopter. I may have to start a thread for that.
by Mike Everman
Sat Jun 24, 2017 4:35 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1715
Views: 274311

Re: Odds and ends

I was thinking drops falling down a flue long enough that they go spherical, but then somehow want to not distort when cold is instantly, somehow, applied. Liquid nitrogen vapor lower in the flue, but with baffles or something to make a sharp change in temperature, I'm thinking. We want the highest ...
by Mike Everman
Sat Jun 24, 2017 3:04 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1715
Views: 274311

Re: Odds and ends

Which reminds me that I want to try and make some perfectly spherical Prince Rupert's drops.
by Mike Everman
Thu Jun 22, 2017 1:43 pm
Forum: Valveless pulsejet forum
Topic: Please put your "I am new and need help" question here.
Replies: 371
Views: 1734504

Re: Please put your "I am new and need help" question here.

Welcome! Start a build log thread for this titanium jet. Should be good. Can't wait to see the color of it running. I have a similar Thermojet, but a bit smaller. Looks like you areabout ready to weld.
by Mike Everman
Wed Jun 21, 2017 1:35 am
Forum: Valveless pulsejet forum
Topic: Valveless pulsejet-computational fluid dynamics
Replies: 33
Views: 4075

Re: Valveless pulsejet-computational fluid dynamics

Ha, nice. Sure does seem that the intake and exhaust alternate. I truly think that u-bent motors benefit from this effect.