Search found 1522 matches

by metiz
Thu Jun 06, 2019 10:31 pm
Forum: Buy and Sell
Topic: Beck Technologies: 4lb Chinese Valveless $225 USD
Replies: 2
Views: 2211

Re: Beck Technologies: 4lb Chinese Valveless $225 USD

I'm afraid he won't answer. This place has been dead for a while and Eric hasn't posted for years. He used to have a website, Becktechnology, but that site's long gone too. He has a youtube channel. Maybe if you send him a pm through there he could reply.
by metiz
Tue Apr 16, 2019 2:46 pm
Forum: Off topic forum
Topic: Luc's Back ... ;-)
Replies: 5
Views: 257

Re: Luc's Back ... ;-)

luc wrote:
Tue Apr 16, 2019 12:23 pm
What about my PJs? Want one? I'll cut you a deal if you want one, but again, you take care of shipping ;-)
Thanks for the offer but I already have waaaay too many of them :lol:
by metiz
Mon Apr 15, 2019 11:52 pm
Forum: Off topic forum
Topic: Luc's Back ... ;-)
Replies: 5
Views: 257

Re: Luc's Back ... ;-)

Welcome back. Everyone's left the party about two years ago though so don't mind the dust. About those pressure jets though... :wink:
by metiz
Fri Dec 07, 2018 10:55 am
Forum: Valveless pulsejet forum
Topic: Plumbing Pulse jet stalling
Replies: 2
Views: 696

Re: Plumbing Pulse jet stalling

Are you using a regulator on your propane bottle? As a rule of thumb: if you think you have too much gas, you don't have nearly enough.
What type of fuel injector are you using and how far down the intake is it?
Is your engine build from known plans (i.e., the pipewood/ ugly stick?)
by metiz
Tue Nov 20, 2018 11:33 pm
Forum: Valveless pulsejet forum
Topic: Lockwood Hiller pulse jet rules of thumb?
Replies: 3
Views: 608

Re: Lockwood Hiller pulse jet rules of thumb?

Hi! It might be a good idea to use Pyro's recipe for beginners for your first engine (it's for valveless engines). That lockwood engine is pretty crappy. For your first attempt, try making a linear engine. They are the most easy to do and easy to start. When you get bored of it, you can have it cut ...
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: 374
Views: 1754242

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: 374
Views: 1754242

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: 1866

Re: Annular M20

Thanks, Mark.
by metiz
Tue Aug 29, 2017 6:25 pm
Forum: Valveless pulsejet forum
Topic: Annular M20
Replies: 5
Views: 1866

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: 116436

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: 1460
Views: 177637

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: 1460
Views: 177637

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: 1087

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: 2482

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: 2304

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.