Search found 1550 matches

by metiz
Mon Nov 02, 2020 4:31 pm
Forum: Valveless pulsejet forum
Topic: Scrap Queen's first foray into valveless pulse jets
Replies: 30
Views: 5663

Re: Scrap Queen's first foray into valveless pulse jets

The Rosscojector is that pinched tube, yes. I've linked to it in the other thread. It looks like your copper pipe is kinked. Try bending it in a bigger loop to prevent that. Also use 2 hose clamps to secure the injector and make sure the injector is pointing straight into the intake. See my masterfu...
by metiz
Mon Nov 02, 2020 2:42 pm
Forum: Valveless pulsejet forum
Topic: Scrap Queen's first foray into valveless pulse jets
Replies: 30
Views: 5663

Re: Scrap Queen's first foray into valveless pulse jets

What kind of injector did you use? A Rosscojector should be able to start an engine of this size without the need for compressed air, if you find the sweet spot. I'm looking forward to your video. If it's possible, also post a picture of your injector, injector setup and fuel delivery system.
by metiz
Sat Oct 31, 2020 11:31 pm
Forum: Valveless pulsejet forum
Topic: Please put your "I am new and need help" question here.
Replies: 383
Views: 1837435

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

Sounds good. Just make sure you don't mechanically constrain the front AND the back of the engine. When it gets hot it will expand a bit and if it can't move, something's gonna buckle. If your engine is red-hot and soft, guess what'll happen.
by metiz
Wed Oct 28, 2020 8:02 pm
Forum: Valveless pulsejet forum
Topic: Scrap Queen's first foray into valveless pulse jets
Replies: 30
Views: 5663

Re: Scrap Queen's first foray into valveless pulse jets

That's more like it! Did you sleeve the intake with a 2nd piece?
by metiz
Wed Oct 28, 2020 10:56 am
Forum: Valveless pulsejet forum
Topic: Please put your "I am new and need help" question here.
Replies: 383
Views: 1837435

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

Hello ScrapQueen, welcome to the forum. For a first build, those welds don't look half bad. My first thermojet looked horrendous. To business: I doubt your engine is going to run. Your exhaust pipe looks to be too fat and too short. Your intake is way too long. Having the intake in the wrong directi...
by metiz
Sat Oct 24, 2020 9:35 pm
Forum: Off topic forum
Topic: youtube
Replies: 1470
Views: 314562

Re: youtube

That's some impressive machining
by metiz
Thu Aug 20, 2020 10:01 am
Forum: Valveless pulsejet forum
Topic: Lockwood Hiller pulse jet rules of thumb?
Replies: 12
Views: 6021

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: 6021

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: 6021

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: 6021

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: 1734

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: 2504

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: 383
Views: 1837435

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: 4985

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: 4452

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: