Search found 57 matches

by Axt
Sat Jun 20, 2009 6:02 pm
Forum: Valveless pulsejet forum
Topic: Hi there, new... and experimental capped design ?
Replies: 12
Views: 2868

Re: Hi there, new... and experimental capped design ?

Ar well i stand corrected Joe, any other specs on that engine other then the pics? Quite an oddball jet you have there Joe :P, let us know how the three injectors go and how you did it. I drew 4 injectors in the picture above and I'll attach how i was planning to do it. Just a brass compression fitt...
by Axt
Fri Jun 19, 2009 11:03 am
Forum: Valveless pulsejet forum
Topic: Hi there, new... and experimental capped design ?
Replies: 12
Views: 2868

Re: Hi there, new... and experimental capped design ?

G'day Steve, one of my first posts here went much the same as yours is with the capped design sparking my interest for its elegant simplicity. I called in the "coaxial comet" for obvious reasons, a glowing red ball with annular flames out the rear sure sounded sweet. You should be able to find that ...
by Axt
Sun Jun 07, 2009 6:22 am
Forum: Valveless pulsejet forum
Topic: Lockwood simulations, wow
Replies: 22
Views: 4637

Re: Lockwood simulations, wow

Hi Liv, Interesting to see so many people I remember from many years back still here posting. Yes granted I should have at least tried to run a stock spec lockwood without modifications, I was too naively confident as the time. A threaded socket and plug, as well as better injector (as is its a stee...
by Axt
Sat Jun 06, 2009 12:20 pm
Forum: Valveless pulsejet forum
Topic: Lockwood simulations, wow
Replies: 22
Views: 4637

Re: Lockwood simulations, wow

Nah theres no restriction in the fuel flow, the stainless socket with brass elbow is the injector. The other bit is a blower running through a check valve for starting air.
by Axt
Sat Jun 06, 2009 2:14 am
Forum: Valveless pulsejet forum
Topic: Lockwood simulations, wow
Replies: 22
Views: 4637

Re: Lockwood simulations, wow

I never got it to run before modifying it to something else which started easier and didnt take so much freekin fuel (thanx to Eric). Can you elaborate more on that Rossco? I too built a lockwood to plans then lost all interest when it didn't start up. Did you do a modification of scavenge it for p...
by Axt
Tue Jul 18, 2006 6:11 am
Forum: Rocket forum
Topic: Thermite Rocket?
Replies: 12
Views: 15665

re: Thermite Rocket?

While its correct that thermite type mixtures will never be high performance, they can actually work. MnO2/Al is a known propellant as the reaction is hot enough to boil manganese. PbO2/Al is hot enough to boil the lead and some Al2O3, but may be too explosive. HgO/Al would obviously form gasseous m...
by Axt
Tue Jun 21, 2005 10:40 am
Forum: Valveless pulsejet forum
Topic: Looking for Vortex gun help
Replies: 7
Views: 3536

re: Looking for Vortex gun help

Perhaps a speaker and capacitor bank will be better for your show. Should be quite a versatile option allowing precise timing and effects. "By discharging capacitors of varying sizes and voltages (0- 12V, 10- 1000 microfarad) through the speaker, different travelling speeds of the rings could be ach...
by Axt
Sun May 29, 2005 7:30 am
Forum: Rocket forum
Topic: Static Test
Replies: 15
Views: 10320

re: Static Test

OK, found some graphite in the cupboard and answered my own question. Based on two tests it seems to fire just as readily as the nichrome igniters. Perhaps they are a bit more fragile but are easier and quicker to make. Below is the stripped wires, dipped in graphite/acetone and then BP/NC/Al/aceton...
by Axt
Sat May 28, 2005 11:43 am
Forum: Rocket forum
Topic: Static Test
Replies: 15
Views: 10320

re: Static Test

Ray, Im interested in the graphite igniters, but am wondering why you would place the battery so close to the engine? For safety safe I always connect the battery well away from anything thats about to fire up. Does the graphite need more power then can be put through ~50m of cable? I cant see if yo...
by Axt
Sun Nov 14, 2004 4:18 pm
Forum: Valved pulsejet forum
Topic: Nanosoft's Big PulseJet
Replies: 22
Views: 10521

Re: Nanosoft's Big PulseJet

Im no authority on this but isnt the area of the valve that flexes much too wide? the petal shape taper down which makes them much more "flippy". try cutting your valve springs into: ____________ | | | | | | | | | | ___ ___ | | | O | ------- ^ yeh.. ok, that never worked. I expect youve already thou...
by Axt
Fri Nov 12, 2004 6:35 am
Forum: Valveless pulsejet forum
Topic: Lockwood propelled Kart
Replies: 9
Views: 3017

Re: Lockwood propelled Kart

marksteamnz wrote:There is an interesting thread on the DIY Gas Turbines Group re a Lockwood propelled Kart. 80 mph so far using liquid fuel fed by two 100psi fuel injection pumps.
http://groups.yahoo.com/group/DIYGasTurbines/
Was a photo ever posted?, cant find it.
by Axt
Sun Aug 22, 2004 11:19 pm
Forum: Off topic forum
Topic: Aaaack! Orcs in my house!
Replies: 6
Views: 3803

Re: Aaaack! Orcs in my house!

.... get the gun.
by Axt
Sun Aug 22, 2004 11:01 pm
Forum: Valveless pulsejet forum
Topic: Sound as a Weapon!
Replies: 5
Views: 4481

Sound as a Weapon!

I read this and thought, those fella's at pulse-jets.com may like this.

Image

Sounds like valveless pulsed combustion to me!
by Axt
Thu Jun 03, 2004 8:23 am
Forum: Valveless pulsejet forum
Topic: New PJ Designs and Feedback
Replies: 205
Views: 83296

PS, Axt where in OZ are you? (of forum if neccasary) Wagga, for the most part. Try the intake idea! Ive been thinking about the easiest way of doing it. I think you could gradually do it by using the small 15mm stainless elbows that you can get. Drill a hole through the intake, cut a length off the...
by Axt
Tue May 18, 2004 4:22 pm
Forum: Valveless pulsejet forum
Topic: New PJ Designs and Feedback
Replies: 205
Views: 83296

Rossco, couldnt it be somewhat improved if one was to add small intakes/exhausts into the main intake. My thoughts - 1. It would allow air to quickly fill the chamber. 2. They will restrict blast out the front, as its being shot back down through it. 3. blasting gas down the intake will help draw in...