Odds and ends

[Mark]

Here's a metal bellows I bought a long time ago, I guess it's kind of like a spring in that it would flex if used for some sort of jam jar. I don't know how or if it would run, but I thought I would give it a try one day.
And then I wondered how a pulsejet body would behave if it had a short flexing section, if it would help the feedback or hurt it or what? I would hope it could get in sync somehow.
Just some deranged arrangements. Bellows and springs, ha ha ha.
Mark

[Jim Berquist]

Mark:

Is that all stainless?

The short peace with the bellows, looks to be some sort of expansion joint for what I don't know! On Micro Wave Radio's we used flex couplings some what like that to make small bends and or correct for small off sets on the Wave Guides.......Silver Plated Copper!!!!

The solid peace of it looks like it would make one hell of a rocket nozzle..H202????????

Yea, Put it all together and you may see it breath on light up and become a few inches longer! Ha!!!! Self Adjusting!!!!! To residence, Maybe!!!!!

I wonder if it could self adjust for residence for various fuels at hand. !!!!

You May Really have something there!!!!!!!

Jim

[Mark]

I think it is either stainless or titanium but not copper.
Mark
http://www.creativevacuum.co.uk/vf.html
http://www.sigmanetics.com/metal_bellows_overview.htm
http://www.bhastrikinternational.com/products.html
http://www.sigmanetics.com/metal_bellows_technology.htm

[Mark]

Here's another strange bellows I bought on eBay. It weighs a ton. It kind of screws with your head because the center thick stainless steel pipe is fixed to the end flange, yet because the bellows flexes all about, if you could see it spring and wobble when I walk with it, you tend to lose the frame of reference as to if the bellows is fixed or the central pipe.
Although it is quite heavy the bellows when pressed down springs back up and bounces about as lively as a Jack-in-the-Box, up and down and side to side for quite some time if I set it on my tile floor. The free end flange probably weighs 5 pounds bobbing up and down on the springy bellows.
Mark

[Jim Berquist]

That's cool , it's all stainlles steal.

Fire one up and see what it can do!!!!

It has the shap, it has the form, make one work!!!!

Jim

[Mike Everman]

OK Mark, you've been wondering what your next wild thing will be... I think you should make a jam jar out of one of these bellows!

The trick thing would be to lock it so it doesn't flex and get the frequency of it's "natural" running state. Then free up the bellows, twang it for it's axial frequency, and add weights (big washers on top, maybe?) until it's mechanical natural frequency equals it's running frequency.

Oooooh, I may have to do that one someday. Imagine the jitterbug it might do!

[Mark]

One thing that crossed my mind is that conceivably it could quickly build up feedback and gunshot or suddenly flameout. Another thing is that if the bellows isn't cooled or if it gets too hot, it will lose it's springiness. Maybe it would make for a good putt-putt motorboat then, for in a way the flex pan designed putt-putt boats are springy too, the way they oilcan.

On a pulsejet it would be interesting to put the bellows in the head where it can get cooling and use/store up some feedback energy opening and closing some air gate whilst also amplifying feedback to new heights. ha
Imagine a bellows "singing" as it flexed back and forth driving the kadency in some way. It wouldn't have to flex a great distance, perhaps just a half inch would be enough, and in some harmonic compatible with the natural resonance of the jet - (perhaps).
I have a typical oilcan that you push the bottom with your thumb to dispense oil. To this I have attached a one inch bell and short snorkel. Spritzed with methanol it looks like it could just barely jam jar to me because the volume doesn't seem that confined. But when you light the tip of the snorkel, it makes a really impressive gunshot for so small a device. It doesn't jam jar, it reports like a carbide cannon. The flexing bottom must really trick or mix up the molecules in an instant, doing something to the wavefront.
Mark

[Mark]

Here's some oilcans someone might like to try/modify. ha
The first one is kind of like my oilcan, I took the stem off and screwed on a bell and short snorkel, the threads matched a 1 inch bell luckily.
Mark
http://www.debellajeepparts.com/oilcan.gif

This one looks like it could be a putt-putt boat.
http://tinyurl.com/2m44c4

http://users.bigpond.net.au/phonedoc/im ... 0After.JPG
http://www.thesouthpaw.net/images/produ ... oilcan.jpg
http://www.fotosearch.com/comp/ICN/ICN208/F0015815.jpg
http://www.veganfamily.co.uk/adda6.jpg
http://www.roadsideattractions.ca/oilcan.jpg
http://flagpole.com/images/jpgs/2006/05 ... oilcan.jpg
http://www.gerardferrari.com/hoofedoilcan.html

[Mark]

Just some "House of Cans" you could make a toy out of, that being a jam jar, putt putt boat, or short-lived pulsejet perhaps. Just something for review. House of Cans. ha
I was pouring out a small bit of oil from some king mackerel I fried today and got a green bean can out from under the sink to put the grease in. I can't help but think that the smooth seamless bottomed can is such a pretty thing, it's a shame something pulsejetty couldn't be made of it without that dreaded "more work than it's worth etiquette." I remember some old pulsejet plans for making a pulsejet out of a can, it involved 4 long all-thread rods to hold it all together, but that's nuts or dedication, depending on your mindset. I'd like something dirty and easy.
Mark
http://www.houseofcans.com/screwcans.html#
http://www.houseofcans.com/images/conetops2.jpg

[Mark]

I was watching a video I made of my little jam jar running, thinking about that cute little upside down tornadic blue flame, dancing off the surface of the methanol, in the bottom of the jar - maybe put some little clouds and ruby slippers in the jar too, to create a diorama. But what I thought about later was that it would be fun to do a two-holed jam jar of some sort, and have the two blue vortexes coalesce into one.
It's really neat to watch the pointiness of the vortex at the top, how energetic and jerky the movements are. Several times out in the Gulf of Mexico I have seen twin waterspouts, and once I remember seeing a boat driving in and out of the spray zone where a waterspout was, playing with nature on a semi-sunny day.
Whirlwind fun.
Mark
http://www.tornadochaser.net/history/wea00313.jpg

[Mark]

I saw some cans of this at the store today. I didn't know they made some with ethanol. It stated that it had non-toxic fumes. I bought one with methanol long ago.
Mark
"material: ethanol"
http://www.don.com/Catalog/browsecatalo ... +Fuel_MAAA

[Mark]

So today I tested my bellows jam jar. I went down to the store and bought some 1/4 28 threaded nuts. Then I made this arrangement and went about testing the springy-walled jam jar.
The first few ignitions were instant flameouts, rather perky ones, I could see the jar flex/stretch impressively. Recall how my flexing oilcan tends to gunshot, I think something similar but less so is happening here. Finally, I got it to run and on this occasion it jitterbugged along typical of a jam jar but with a fanciful rhythmic flexing.
Then another time I shook the jar and took my finger off the lid and could feel the jar slightly shrink as the pressure was let off. Then I got a phone call from my brother in Chicago and my wife was at the back door holding the phone up signaling me and as I was distracted velcroed my right eyelash and eyebrow just as I turned to around lighting the jar. I could swear my face was at least 2 feet from the lid. Anyway, hot gases can travel. The last few attempts the jar started to constantly speed up until it flamed out in about 5 seconds of time.
No gold to be found as of yet.
Mark

[Mark]

I think most of my pulsejet efforts start out an exposition, then they go directly to a falling action and the denouement, like today.
Mark
http://en.wikipedia.org/wiki/Image:Freytags_pyramid.svg

[Mike Everman]

Velcroed eyebrow... ha ha ha ha ha Man, have I been there!
You going to try to restrain the bellows action and attempt to match mechanical with cadenacy? I may have to fly out there and make you try it! ;-)

[Mark]

I saw these at the store today in the lamp section, they were less than $2.00 so I bought them. They are the 1/8th inch pipe all-thread and hollow of course for lamp wire to sleeve inside.
These are the same sized nipples I used for my side-ported Logan. I figure I can find some nuts and fashion some sort of nipply jam jar snorkelator/chuffer of some sort, by using a nut on either side of the lid to hold them in place. I might try some sort of phased array, as the package comes with various sizes, the jam jar lid perhaps looking akin to Captain Nemo's pipe organ. ha
Mark