Odd Metal jars

Mark · Post by **Mark** » Mon Mar 17, 2008 4:42 pm

A pretty green flame for March 17. Or is the camera making a blue look green?

GRIM · Post by **GRIM** » Mon Mar 17, 2008 7:11 pm

Definitely blue flames down here ,
I guess something has to give when you compress these vids down to below 2 mb,

just the same; blue, green , pink, there should be 3 of them , I cant see anything here at work, the server blocks the player,

Mark · Post by **Mark** » Tue Mar 18, 2008 1:42 am

The flame was blue on my computers at work, so it must be some green translation problem with my computer. I noticed a few thin, faint, vertical lines off to the left of the flames, one was blue, the other yellow. Wow, I just watched it again and the flames are blue now! And I'm not even taking Viagra! ha I think my computer is learning how to read the format now.
I just put that in because I recall hearing about it's side effects and thinking that's quite an odd effect. Boxers who get hit in the head sometimes lose their color vision for a few days.
"Less common side effects that may occur are temporary changes in color vision (such as trouble telling the difference between blue and green objects or having a blue color tinge to them), eyes being more sensitive to light, or blurred vision."
http://www.genericviagra.org/

PyroJoe · Post by **PyroJoe** » Mon Mar 24, 2008 1:26 pm

12" diameter at the base, 26" length/height. It cycles slowly for about 5 seconds bottom fed on gasoline. Building a inner nozzle to be attached to a access plate on the side of the CC. Doesn't ignite from the opening, drilled a 3/16" hole in the side 9" from the bottom. use the MAPP torch to ignite through the hole.

The propane fuel ring on the large draft engine is constantly catching fire, will need to change layout.

PyroJoe · Post by **PyroJoe** » Wed Mar 26, 2008 9:11 pm

Here are some pics of the fuel ring on the large draft engine. I plan to change it up. Any suggestions/ideas/wild guesses before I start cutting?

GRIM · Post by **GRIM** » Mon Mar 31, 2008 12:04 pm

Here is my pulseboiler

It is actually an old thermojet CC that has the original inlets cut off and welded closed,
It has an outer skin separated from the inner cc wall by about 8 mm ,
The inlet is only about 2” long and it has a a Pyro Joe draft style exhaust,
The fuel injector is a radial washer type ,
No sparkplug , no air start , just a match down the inlet

Here I am pumping water into the outer jacket with a small electric fuel pump,

just fun

GRIM · Post by **GRIM** » Mon Mar 31, 2008 12:30 pm

Heres a video of the pulseboiler transition from blowlamping to resonant running,
As I slowly open the fuel valve, you can see the blue gas / air mix start to accumulate in the throat of the CC, and when it actually blocks the inlet there is an instant transition to resonant running, then as I turn the fuel down again it slips back in to the CC, faaascinating !!

GRIM · Post by **GRIM** » Mon Mar 31, 2008 12:39 pm

Heres the 180 pulsejetboiler ,
180 tailpipe , longer inlet and injector although it runs great , I had to weld a sparkplug in, and it requires air to start,
It is much more fun in draft configuration,

PyroJoe · Post by **PyroJoe** » Mon Mar 31, 2008 3:10 pm

That boiler is great. The flame to cycling transition is interesting, I see it also from time to time. If a poor injector is used it will often have a tough transition from the blow torching to pulsing and it can be a battle. If you install the last 45's up higher (on the 180) you may be able to start airless. I plan to do the same next weekend.

I spent some time adjusting the tailpipe transition on mine. Ended up with a 27 degree tailcone transition and of course, that 90 had to go. It helped ease the fussy.

After the modifications, I was testing it with the 3 point injector and achieved the best runs ever for this engine. I tested some other types of stinger injectors, but that three point "kicked butt". I really am pleased with that injector.

It achieved the highest frequency with this size of chamber and orfice (that I have observed). A few times I thought it might go ahead and PJ with the orfice! It was close several times but couldn't make the transition. This led to another modification I will reveal in a few days.

Also included is some organ pipeing.

IMO the "sounding" frequency has no role to determine if a engine performs well. It doesn't matter the frequency a pipe will "hoot","Rijke tube" or "Organ Pipe" under a thermal load.

What counts is for the tailpipe to work as a inertial pump. A majority of tailpipe volume has to be displaced each cycle. True, this is only exhaust from the last cycle, but a fair amount needs to be displaced to make room in the CC for the next intake volume.

It becomes obvious, when the tailpipe is removed. Stand alone combustion chambers have a tough time creating the same pumping action as created by the tailpipe.

PyroJoe · Post by **PyroJoe** » Mon Mar 31, 2008 6:13 pm

Finished the inner nozzle on the big jar and welded it to the access plate. It is only cycling for a few seconds on gasoline or propane. No "PulseLove" yet.
EDIT: design note: Reynst may have used a flue pipe with the early "improved pot" designs.

Reynst: "Early in development, design included a flue to carry the exhaust gasses into the open. It was possible to seperate mixture and exhaust by setting up a pipe of the same diameter as the mouth of the chamber, at a little distance from it. The edge of the pipe was sharp."

PyroJoe · Post by **PyroJoe** » Fri Apr 04, 2008 1:36 pm

The recent modification on the large draft engine was to add a 4" long section of pipe to the intake opening. It was aligned inside the opening and stitch welded in two spots for easy removal. This pushed it up into PJ range, it now locks in.

PyroJoe · Post by **PyroJoe** » Fri Apr 04, 2008 2:18 pm

Here is a jar with a regenerator tube welded to the bottom. The regenerator is filled with SS wire mesh scrubbers. It is very muffled, sound is almost absent in the video. Lynyrd Skynyrd would say "turn it up".

PyroJoe · Post by **PyroJoe** » Mon Apr 07, 2008 1:09 pm

Draft pipe changed. Fro fryer and ankle biter. ha

larry cottrill · Post by **larry cottrill** » Mon Apr 07, 2008 1:23 pm

A mighty scorpion, warning that he is about to strike!

L Cottrill

PyroJoe · Post by **PyroJoe** » Tue Apr 08, 2008 2:23 pm

A side note on the large draft engine. Before adding the tail transition cone, the engine would run a bit rough. When the engine was warm on occasion it would flame out.

It only took a short time for the heated draft pipe to clear all the exhaust from the chamber. This left a fresh charge of air in the chamber, if fuel was also present, on relighting this made a severe blast. The strongest blast of any jetish thing observed to date. One time it had my ears ringing while wearing earplugs.

I think if a sparkplug could be installed and timed correctly, this type engine could make a slow cycle blast engine. At this time I have no use for this type of operation. Maybe in the future if a noise device is needed it may be developed.

After adding the cone transition, the strong blast is gone.

www.pulse-jets.com

Odd Metal jars

Copper electrons

ROY G BIV