Search found 1517 matches

by metiz
Fri Jun 22, 2018 9:57 pm
Forum: Valveless pulsejet forum
Topic: Please put your "I am new and need help" question here.
Replies: 373
Views: 1740421

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

hermanpj wrote:
Fri Jun 22, 2018 9:46 pm
Has anyone died from home made pulse jet detonation? Just curious. 😀
I can guarantee no one has, since a pulse-jet deflagrates and not detonates :D
by metiz
Fri Jun 22, 2018 9:05 pm
Forum: Valveless pulsejet forum
Topic: Please put your "I am new and need help" question here.
Replies: 373
Views: 1740421

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

Hi, welcome to the forum! I've been reading your questions and I have some feedback. Fair disclaimer: I have never worked with an ugly stick. In your first post you describe you get a pop or two but mostly yellow flames from the exhaust. To me that sounds like your ignition isn't up to scratch. init...
by metiz
Wed Aug 30, 2017 2:13 pm
Forum: Valveless pulsejet forum
Topic: Annular M20
Replies: 5
Views: 1117

Re: Annular M20

Thanks, Mark.
by metiz
Tue Aug 29, 2017 6:25 pm
Forum: Valveless pulsejet forum
Topic: Annular M20
Replies: 5
Views: 1117

Annular M20

I build an annular version of the M20 about a year ago. I could not get the injectors out far enough to get it to run. A couple of weeks back I fixed the issue and today I tried again. Although it runs, it's a huge pain in the ass to get going. Thrust is rather disappointing too: 11.4 pounds (origin...
by metiz
Thu Aug 17, 2017 11:55 am
Forum: Valveless pulsejet forum
Topic: Mike's Build Log
Replies: 379
Views: 101371

Re: Mike's Build Log

Hi Mike, Just a thought but the fuel you are using is ethanol? - very hydroscopic- Dave, a mate of mine, who is well into his chemistry, can process/refine it to remove almost all the water - I can ask him what it is he does to do this ( I recall he added something to the fuel and it solidifies at ...
by metiz
Mon Jul 31, 2017 10:51 pm
Forum: Off topic forum
Topic: youtube
Replies: 1454
Views: 160907

Re: youtube

I was realy excited to read that article, until I saw the 100 grand price. Not quite mainstream. 100 grand will buy you a lot of nice machining tools
by metiz
Tue Jun 13, 2017 8:06 pm
Forum: Off topic forum
Topic: youtube
Replies: 1454
Views: 160907

Re: youtube

Lol it's a scaled version of the M500, tailpipe reinforcements and all
by metiz
Wed Jan 18, 2017 5:11 pm
Forum: Valveless pulsejet forum
Topic: Thermojet not producing thrust
Replies: 1
Views: 654

Re: Thermojet not producing thrust

it doesn't look like you flared the intakes. This will limit throttle range and thus thrust. Flare them and try again. It'll run a lot harder
by metiz
Fri Oct 14, 2016 10:58 pm
Forum: Valved pulsejet forum
Topic: Pulse Jet Compression
Replies: 6
Views: 1571

Re: Pulse Jet Compression

Easily. No moving parts to waste energy on
by metiz
Thu Sep 22, 2016 10:14 pm
Forum: Valveless pulsejet forum
Topic: Do you see anything wrong with this pulse jet?
Replies: 8
Views: 1411

Re: Do you see anything wrong with this pulse jet?

I'm not sure about our injector suggestion - I have never done an injector like this. I don't think you'll be able to start automatically like this. just try with a hand hold Rosscojector to see if it starts easier. Once running, switching to liquid fuel should be doable.
by metiz
Wed Sep 21, 2016 3:55 pm
Forum: Valveless pulsejet forum
Topic: Do you see anything wrong with this pulse jet?
Replies: 8
Views: 1411

Re: Do you see anything wrong with this pulse jet?

Ah now I see. the small version of the picture made me believe that was a sparkplug. I think that is the crux of the problem though: the motor doesn't like the injector at that point. You want a tube pointing down the intake, depending on type, 0-50% of the length. The fuel is now delivered at the w...
by metiz
Tue Sep 20, 2016 10:40 pm
Forum: Valveless pulsejet forum
Topic: Do you see anything wrong with this pulse jet?
Replies: 8
Views: 1411

Re: Do you see anything wrong with this pulse jet?

Open up the spark gap a bit to get the gas to properly ignite. What kind of injector are you using, and is the propane bottle full and unrestricted?
by metiz
Fri Aug 19, 2016 9:43 am
Forum: Valved pulsejet forum
Topic: Pulse Jet Compression
Replies: 6
Views: 1571

Re: Pulse Jet Compression

I'm still here! :P
by metiz
Thu Jul 14, 2016 12:03 pm
Forum: Off topic forum
Topic: Nomenclature: pulsejet vs ramjet (Was V1 Clone)
Replies: 8
Views: 4235

Re: Nomenclature: pulsejet vs ramjet (Was V1 Clone)

When the forum is as dead as this one, any post is apreciated. Thanks for the reference!
by metiz
Tue Jun 07, 2016 8:05 pm
Forum: Off topic forum
Topic: June 12th
Replies: 4
Views: 1115

Re: June 12th

I see. Why would we want to celebrate this exactly, Fileeraus?