Search found 55 matches

by HPSCL
Sun Apr 03, 2011 5:47 pm
Forum: Valveless pulsejet forum
Topic: pulse jet fuel
Replies: 7
Views: 5185

Re: pulse jet fuel

first can someone tell me if you vaporize gasoline and use it instead of propane will it work? if its does will you get more thurst. second And I know this might be stupid but at the temp a pulse jet works while its running if you vaporize water and inject it in might it work like nos in a car the ...
by HPSCL
Fri Apr 01, 2011 4:20 am
Forum: Valveless pulsejet forum
Topic: Proposed: Linear FWE Rebuild
Replies: 5
Views: 4399

Re: Proposed: Linear FWE Rebuild

Unfortunately, the Sanitary Tubing U bend would be several hundred dollars (remember, this is 4-inch stainless tubing) and it would take a few hundred more to make the mounting hardware. So, don't look for this anytime soon ;-) It would, of course, be my first "bent" engine. Mr. Cottrill, if it int...
by HPSCL
Sun Mar 27, 2011 12:51 am
Forum: Valveless pulsejet forum
Topic: Acoustic Length Starting Point on Curved Surfaces
Replies: 3
Views: 1786

Re: Acoustic Length Starting Point on Curved Surfaces

Thanks, for the reply, Viv! To answer your question, "HPSCL" stands for H ydro- P neumatic S upercharged C ombustion L auncher"... Many years ago, I designed the world's first "supercharged" PVC combustion launcher. They're more commonly referred to as "Hybrids", in the spudgunning community. At the...
by HPSCL
Sat Mar 26, 2011 5:34 pm
Forum: Valveless pulsejet forum
Topic: Acoustic Length Starting Point on Curved Surfaces
Replies: 3
Views: 1786

Acoustic Length Starting Point on Curved Surfaces

When using a curved surface to mount your tailpipe and/or intake to, where is the starting point (of the length) of your component?
** Is it at the longest (top) or the shortest (bottom) of where the component enters into the combustion chamber?

Note: Please refer to attached drawing as a reference.
by HPSCL
Wed Mar 02, 2011 8:13 am
Forum: Valveless pulsejet forum
Topic: Idea for Adjustable Fuel Injector
Replies: 2
Views: 1859

Re: Idea for Adjustable Fuel Injector

That looks like a pretty cool idea. I might have to try it out on the big lockwood. Any ideas on how many holes you think to run a big lockwood? Keith I found a pdf file on the fuel rail for a large pulsejet, on this topic: Lockwood Help 16 holes (8 sets of 2; holes were drilled straight-thru) @ 0....
by HPSCL
Tue Mar 01, 2011 8:00 pm
Forum: Valveless pulsejet forum
Topic: Idea for Adjustable Fuel Injector
Replies: 2
Views: 1859

Idea for Adjustable Fuel Injector

..... The inside diameter (If I'm not mistaken) of 5/16" Steel BrakeLine is 1/4" and the O.D. of 1/4" Steel BrakeLine is (of course) 1/4" . - If you were to sleeve the 1/4" BrakeLine, with 5/16" Brakeline... FI1.jpg ..... While you're trying to start your newly-fabricated pulse jet, this sleeve cou...
by HPSCL
Wed Feb 16, 2011 4:53 pm
Forum: Valveless pulsejet forum
Topic: Please put your "I am new and need help" question here.
Replies: 376
Views: 1763457

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

You're quite welcome... but please forgive the fact that I also should have mentioned that flaring the opening of your intake will help enormously. If you're not adding one as a separate piece, make sure the flare is even all the way around. I wish you Good Luck and hope to see you post, by later th...
by HPSCL
Wed Feb 16, 2011 8:46 am
Forum: Valveless pulsejet forum
Topic: Please put your "I am new and need help" question here.
Replies: 376
Views: 1763457

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

I have made a lockwood hiller model valveless pulsejet engine.its my first attempt and initial starting made it work okay.but when i tested again the engine is starting with a blast and then after removing the compressed air from the inlet the engine is not sustaining its operation .Instead the gas...
by HPSCL
Thu Feb 10, 2011 2:57 am
Forum: Valveless pulsejet forum
Topic: Pulsejet Build
Replies: 26
Views: 7147

Re: Pulsejet Build

Might consider the M25 by metiz: http://www.pulse-jets.com/phpbb3/viewtopic.php?f=3&t=5877 No bends in that one, and a proven design :wink: It is not adviseable to hard fold a Lockwood as they are some what based on the Marconnet, with a larger volume of the CC nearest the tail. I have tried to har...
by HPSCL
Tue Feb 08, 2011 7:07 am
Forum: Valveless pulsejet forum
Topic: Pulsejet Build
Replies: 26
Views: 7147

Re: Pulsejet Build

Well, this thread has become stale. Since I am still waiting for any reply for an engine, I have since decided to move on to a different design. There are plenty of large lockwood designs out there. The reason for not going to one originally was that tricky U-bend. Unsure of how to get one I ruled ...
by HPSCL
Tue Feb 01, 2011 4:43 am
Forum: Valveless pulsejet forum
Topic: can't ignite
Replies: 30
Views: 8056

Re: can't ignite

walker925 wrote: Also if this won't work, I'm going to give up on it for now and try the ugly stick. I need this for a science project thats approaching, and the ugly stick looks pretty easy. any suggestions?
Sent you a PM
EDIT: Oh... you already replied - sent you another PM. as well.
by HPSCL
Mon Jan 31, 2011 5:01 am
Forum: Valveless pulsejet forum
Topic: can't ignite
Replies: 30
Views: 8056

Re: can't ignite

As Mr. Everman stated; If you're not able to achieve a leak-free joint, it'll make the engine much more difficult to get running. Even if by some chance you do get it running, a small leak will severely limit it's throttle range. - Another downside is the fact that you're using galvanized pipe. I've...
by HPSCL
Mon Jan 31, 2011 1:40 am
Forum: Valveless pulsejet forum
Topic: can't ignite
Replies: 30
Views: 8056

Re: can't ignite

It (more than likely) won't, with the way you have it set-up now. The reason being, is that you have it configured "Shubert"-style. (With the intake and tailpipe "inline". The engine's flame-front will cycle straight back-and-forth, rather than circulate. I've found that kind of configuration extrem...
by HPSCL
Sun Jan 30, 2011 5:07 pm
Forum: Valveless pulsejet forum
Topic: can't ignite
Replies: 30
Views: 8056

Re: can't ignite

°- The length of your tailpipe should be 11 times the I.D. (Inside Diameter). °- The INSIDE of the end of the tailpipe should be filed, so that there is a smooth taper. °- Calculate the volume of the finished tailpipe. ( Pi x R² x length) °- Your combustion chamber's volume should EQUAL the tailpip...
by HPSCL
Thu Jan 27, 2011 7:02 am
Forum: Valveless pulsejet forum
Topic: I need a valveless pulsejet
Replies: 5
Views: 2114

Re: I need a valveless pulsejet

... Unless you have something else that I missed on youtube. I made this out of spare parts that I had lying around. - I would safely assume that it could easily melt snow. Propane torches were selling between 60-100 bucks and I was being a cheapskate, as always. I would guess that a professionally...