Search found 1515 matches

by metiz
Wed Aug 30, 2017 2:13 pm
Forum: Valveless pulsejet forum
Topic: Annular M20
Replies: 4
Views: 534

Re: Annular M20

Thanks, Mark.
by metiz
Tue Aug 29, 2017 6:25 pm
Forum: Valveless pulsejet forum
Topic: Annular M20
Replies: 4
Views: 534

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: 364
Views: 87944

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: 1449
Views: 145188

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: 1449
Views: 145188

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: 397

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: 1007

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: 948

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: 948

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: 948

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: 1007

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: 3613

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: 696

Re: June 12th

I see. Why would we want to celebrate this exactly, Fileeraus?
by metiz
Mon Jun 06, 2016 10:55 pm
Forum: Off topic forum
Topic: June 12th
Replies: 4
Views: 696

Re: June 12th

What's special about june 12?
by metiz
Wed May 25, 2016 5:40 pm
Forum: Valveless pulsejet forum
Topic: would this be considered a low frequency rudimentary pulse?
Replies: 7
Views: 907

Re: would this be considered a low frequency rudimentary pul

Try something like this. Bend your injector tube back 180 degrees so you can tie it to the intake with some hose clamps. are you talking about keeping the torch attachment or removing that all together and hooking the propane directly up to the injector tube? Like Tufty said, lose any restriction b...