Search found 1529 matches

by metiz
Thu Aug 20, 2020 10:01 am
Forum: Valveless pulsejet forum
Topic: Lockwood Hiller pulse jet rules of thumb?
Replies: 12
Views: 3007

Re: Lockwood Hiller pulse jet rules of thumb?

Yes you are correct, I was thinking way too complicated. I made a drawing to clarify things. The flare should be a bell mouth, not just a 45 degree cone. Also, do not just start adding lengths of pipe; stick to the plans.
by metiz
Mon Aug 17, 2020 8:51 am
Forum: Valveless pulsejet forum
Topic: Lockwood Hiller pulse jet rules of thumb?
Replies: 12
Views: 3007

Re: Lockwood Hiller pulse jet rules of thumb?

Pretty sure R.25 refers to "radius 0.25" which would mean that your radius is 3.52/2=1.72
1.76*0.25=0.44
1.76+0.44=2.2

That means the intake measures 2.2" across from your flare. I suggest also cutting the engine down to size and using the correct diameters
by metiz
Tue Jul 28, 2020 8:08 am
Forum: Valveless pulsejet forum
Topic: Lockwood Hiller pulse jet rules of thumb?
Replies: 12
Views: 3007

Re: Lockwood Hiller pulse jet rules of thumb?

Maybe the ball valve is restricting flow? Just running it from the tank should be enough to really get it going.
by metiz
Sat Jul 18, 2020 10:55 am
Forum: Valveless pulsejet forum
Topic: Lockwood Hiller pulse jet rules of thumb?
Replies: 12
Views: 3007

Re: Lockwood Hiller pulse jet rules of thumb?

Good job! Try flaring the intake and don't use a gas regulator
by metiz
Wed Apr 22, 2020 12:01 pm
Forum: Valveless pulsejet forum
Topic: A short video of my thermojet running!
Replies: 2
Views: 719

Re: A short video of my thermojet running!

Good stuff! Next time try giving it more fuel, you've barely got it idling. You can get a digital crane scale from ebay for like 10 dollars
by metiz
Fri Dec 27, 2019 7:36 pm
Forum: Valveless pulsejet forum
Topic: Christmas bonus!
Replies: 2
Views: 1382

Re: Christmas bonus!

Oh man, good to know I was never this green :P
by metiz
Wed Oct 23, 2019 11:29 pm
Forum: Valveless pulsejet forum
Topic: Please put your "I am new and need help" question here.
Replies: 376
Views: 1793089

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

Hey! I'm new and I need help. I'm making a Lockwood pulsejet as my high school senior project and I need specific guidance. The actual design of the jet isn't the problem --I plan on using the Lockwood Patent design-- but I need help learning how to assemble it and where and how to buy/make all the...
by metiz
Thu Jun 06, 2019 10:31 pm
Forum: Buy and Sell
Topic: Beck Technologies: 4lb Chinese Valveless $225 USD
Replies: 2
Views: 3808

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: 2653

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: 2653

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: 2272

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: 12
Views: 3007

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: 376
Views: 1793089

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: 376
Views: 1793089

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: 3756

Re: Annular M20

Thanks, Mark.