Search found 4928 matches

by Mike Everman
Mon Dec 10, 2018 1:28 pm
Forum: Valveless pulsejet forum
Topic: Plumbing Pulse jet stalling
Replies: 2
Views: 36

Re: Plumbing Pulse jet stalling

The intake looks too short, and needs to be rounded inside as much as the wall thickness will allow.
by Mike Everman
Tue Dec 04, 2018 4:54 pm
Forum: Valveless pulsejet forum
Topic: Lockwood Hiller pulse jet rules of thumb?
Replies: 3
Views: 104

Re: Lockwood Hiller pulse jet rules of thumb?

Holy Canoli. 26" tailpipe exit? Might I suggest you start with a smaller, known to run motor to get yer feet wet? There's a lot to it before jumping into something so dangerous.
Scaling is definitely screwy up in this range.
by Mike Everman
Tue Oct 16, 2018 1:37 pm
Forum: Valveless pulsejet forum
Topic: Please put your "I am new and need help" question here.
Replies: 374
Views: 1744572

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

Welcome Newbs! I sure hope you find a usable 2d cfd code. How hard could it be?? Ha We definitely had fun with 1d uflow and nudis, but something more appropriate is needed. It is too much to expect I suppose to have freeware that would run pulsating combustion events, but I wait patiently. Happy pul...
by Mike Everman
Tue Sep 25, 2018 10:22 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 105894

Re: Mike's Build Log

We may be wondering: Why, Mike, Why? Well, reasoning goes like this: I don't want a big horribly loud motor that wriggles my gizzards to push me around if I can create some mechanical advantage with a smaller one. I could technically push myself around with this 5 lb thrust, but it would not tolerat...
by Mike Everman
Tue Sep 25, 2018 5:30 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 105894

Re: Mike's Build Log

yeah, this is a fun one, Mark. With the skate wheel driving the side of the bike wheel, it will be a bout 1700 RPM per 10 MPH. I think it should take the heat, and part of it is going to be pumping cool air, so maybe it won't get as hot as I fear. I got the right angle gearheads today. Pretty beefy....
by Mike Everman
Mon Sep 17, 2018 10:57 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 105894

Re: Mike's Build Log

reduced impeller vid.mp4
(2.69 MiB) Downloaded 55 times
by Mike Everman
Mon Sep 17, 2018 10:47 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 105894

Re: Mike's Build Log

You know, once you let go of any dreams of high performance pushing a bike around with 5 lb of thrust, the problem opens up and gets really fun. Doing some math, I realized that making a larger diameter free turbine gets me very little. My original thought was that the thrust acting on a bigger radi...
by Mike Everman
Mon Sep 10, 2018 2:02 pm
Forum: Valveless pulsejet forum
Topic: Valveless pulsejet-computational fluid dynamics
Replies: 37
Views: 5993

Re: Valveless pulsejet-computational fluid dynamics

Hi Ganesh, fuel is propane and i will post a pic of the fueling.
My motors are bent into a “u”. Do you need a straight or can you do the bent version?
by Mike Everman
Fri Sep 07, 2018 11:57 pm
Forum: Valveless pulsejet forum
Topic: Valveless pulsejet-computational fluid dynamics
Replies: 37
Views: 5993

Re: Valveless pulsejet-computational fluid dynamics

Hi Zono and Ganesh, I'd like very much to know if this motor's intake and exhaust alternate. I'm about to put it to a turbine and in or out of phase is important. Any interest in running this geometry? I'm imagining test rigs to find out, but thought you guys would enjoy the idea. pocket jet, 3.5 lb...
by Mike Everman
Thu Sep 06, 2018 2:34 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 105894

Re: Mike's Build Log

Ah yessss, pushbutton starting works! 8AFD2B88-BCD7-4CE0-84AF-98E36625D9DB.jpeg I’ll get a youtube up of the successful result. I ran out of fittings, so decided to try a direct line to the starting stinger, and adjusting the needle valve going to the main feed. The next iteration needs ability to s...
by Mike Everman
Thu Sep 06, 2018 2:20 pm
Forum: Ramjet forum
Topic: Subsonic Ramjet Design Project
Replies: 15
Views: 1045

Re: Subsonic Ramjet Design Project

Wouldn’t hurt to put an X rib on any big areas. You will wish you’d spent just a bit more on 304 or 321. I llok at some of my prototypes and wish I’d let go of mild steel much earlier. I’ve given the rectangular architecture a lot of thought and modeling, but no gas dynamic, stress or fatigue work, ...
by Mike Everman
Mon Aug 27, 2018 6:39 pm
Forum: Tools and Construction
Topic: Quartz
Replies: 42
Views: 16270

Re: Quartz

Drilling pinholes will be a hot topic if I have the glass blowers blow me a pocket jet. I would like to preserve the fueling I use, which will be tricky in quartz. Thinking laser.
by Mike Everman
Mon Aug 27, 2018 2:42 pm
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 105894

Re: Mike's Build Log

Oh yeah, I suppose we did talk about this http://www.pulse-jets.com/phpbb3/viewtopic.php?f=3&t=4190&hilit=chicken+drive&start=15#p59619 I think I'm favoring the simple free turbine idea better now. I can imagine the Coriolis and centrifugal forces going on are going to massively hurt flow on the "sp...
by Mike Everman
Mon Aug 27, 2018 1:55 pm
Forum: Ramjet forum
Topic: Subsonic Ramjet Design Project
Replies: 15
Views: 1045

Re: Subsonic Ramjet Design Project

IDK. I know it’s not a guessing or cut and try game though. There are governing gas dynamic principles you need to observe. Ones I do not know and have not researched.
by Mike Everman
Mon Aug 27, 2018 1:51 pm
Forum: Tools and Construction
Topic: Quartz
Replies: 42
Views: 16270

Re: Quartz

I’m going to make a plastic guide and see if I can cut it net size. The wire should make a nice finish if guided properly.