Materials Science
Moderator: Mike Everman
Materials Science
How about some volcanic basalt? I wonder if they make a line of swimwear in this fabric?
Mark
http://www.gaskets-and-gasketing.com/
Mark
http://www.gaskets-and-gasketing.com/
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re: Materials Science
It's not Egyptian cotton but more fire resistant.
Mark
http://www.albarrie.com/Filtration/fil-basalt.html
http://www.laseroptronix.se/exoma/basalt.pdf
Mark
http://www.albarrie.com/Filtration/fil-basalt.html
http://www.laseroptronix.se/exoma/basalt.pdf
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Re: Materials Science
Thanks for the link. I've been looking for a source. I've been using some header heat wrap.Mark wrote:How about some volcanic basalt? I wonder if they make a line of swimwear in this fabric?
Mark
http://www.gaskets-and-gasketing.com/
I'm writing an automated airplane designer in java, useful later when you guys get ready to bolt a p-jet onto some wings
re: Materials Science
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I was imagining that it would be fun to coat my quartz tubing with titanium compounds. In that way I could have the most colorful pulsejet and I could also win the Kitsch award too maybe.
Mark
http://cgi.ebay.com/3-2-Iridescent-RAIN ... dZViewItem
http://cgi.ebay.com/FLAME-AQUA-AURA-TIT ... dZViewItem
I like this effect.
http://www.kellerartglass.com/html/dichroic.html
http://crystalwooddesigns.com/images/T3a.JPG
http://www.jimcolemancrystals.com/images/COLL-4.JPG
Mark
http://cgi.ebay.com/3-2-Iridescent-RAIN ... dZViewItem
http://cgi.ebay.com/FLAME-AQUA-AURA-TIT ... dZViewItem
I like this effect.
http://www.kellerartglass.com/html/dichroic.html
http://crystalwooddesigns.com/images/T3a.JPG
http://www.jimcolemancrystals.com/images/COLL-4.JPG
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re: Materials Science
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re: Materials Science
Back to the Aerogel. If it were possible, coat the outside of a pule jet in aerogel, this would not only make it much more efficient, and cool/safe, it would also knock down the noise substantially. 1/4-1/2" coating would be sufficient to have those benefits.
Some Day.....
Some Day.....
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re: Materials Science
Really, well then why is it louder standing in front of the engine, then behind it, in the flow of its exhaust gasses?
Noise isn't just admitted from the intakes and exhausts; it comes from the actual combustion chamber. I have noted in fact, much less noise coming from the actual engines openings. Aerogel has proved to be quite a thermal insulator, but also is a very at impeding sound.
Noise isn't just admitted from the intakes and exhausts; it comes from the actual combustion chamber. I have noted in fact, much less noise coming from the actual engines openings. Aerogel has proved to be quite a thermal insulator, but also is a very at impeding sound.
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re: Materials Science
I'm not saying the metal is making the noise. The greatest intensity of noise happened to mainly come from the combustion chamber, as noted by my observations.
Yes adding this layer of Aerogel will substantially raise the engines operating temperature, but at the same time, why not coat the inside of the pipes also. New nano technology is proving beneficial in the field of corrosion prevention of metal. New processes and technology's have now been developed which make it possible to coat a pipe or other solid metal surface with nano tubes. I'm unsure if this can be done specifically with Aerogel, but its a thought.
Yes adding this layer of Aerogel will substantially raise the engines operating temperature, but at the same time, why not coat the inside of the pipes also. New nano technology is proving beneficial in the field of corrosion prevention of metal. New processes and technology's have now been developed which make it possible to coat a pipe or other solid metal surface with nano tubes. I'm unsure if this can be done specifically with Aerogel, but its a thought.
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re: Materials Science
Dang -
It was Eric who posted his observation (and he is a good observer!) last year that the noise at the side of one of his valveless pulsejets was much greater than the noise on axis behind the tail end. Here's a rough diagram I drew (based on standard FWE geometry) of a possible scenario that would make this happen. I suspect that something like this is what you're observing. With the right tools, you could actually measure this. Note that the pattern I drew here is not "to scale" - it's just a made-up example to illustrate how this could happen.
The circles represent the highest pressure peak lines of the waves - same fundamental frequency, emanating from two points - the intake and exhaust. Where the peaks add together, you get highest intensity. Where a peak coincides with a trough, you get lowest intensity. It works with sound exactly like it does with light - only the wavelength is millions of times greater.
Note that the wave pressure theoretically radiates spherically from the intake and exhaust 'acoustic points' uniformly - it is NOT "shotgunned" in a particular direction, as the exhaust gas mass is !!!
L Cottrill
It was Eric who posted his observation (and he is a good observer!) last year that the noise at the side of one of his valveless pulsejets was much greater than the noise on axis behind the tail end. Here's a rough diagram I drew (based on standard FWE geometry) of a possible scenario that would make this happen. I suspect that something like this is what you're observing. With the right tools, you could actually measure this. Note that the pattern I drew here is not "to scale" - it's just a made-up example to illustrate how this could happen.
The circles represent the highest pressure peak lines of the waves - same fundamental frequency, emanating from two points - the intake and exhaust. Where the peaks add together, you get highest intensity. Where a peak coincides with a trough, you get lowest intensity. It works with sound exactly like it does with light - only the wavelength is millions of times greater.
Note that the wave pressure theoretically radiates spherically from the intake and exhaust 'acoustic points' uniformly - it is NOT "shotgunned" in a particular direction, as the exhaust gas mass is !!!
L Cottrill
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- A possible scenario for the layout of noise around a valveless engine (FWE shown). Drawing Copyright 2005 Larry Cottrill
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re: Materials Science
Oooh, that's a nice one, Ben. I may have to plot that for fun.
Mike Often wrong, never unsure.
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re: Materials Science
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http://www.geocities.com/CapeCanaveral/ ... ramic.html
http://www.engr.sjsu.edu/WofMatE/ceramics.htm
http://www.ultrahardmaterials.co.uk/articles.html
http://www.transportation.anl.gov/publi ... nents.html
http://waw.wardsauto.com/ar/auto_tiny_e ... /index.htm
http://www.calmis.ca.gov/file/occguide/ENGCERAM.HTM
http://www.engr.sjsu.edu/WofMatE/ceramics.htm
http://www.ultrahardmaterials.co.uk/articles.html
http://www.transportation.anl.gov/publi ... nents.html
http://waw.wardsauto.com/ar/auto_tiny_e ... /index.htm
http://www.calmis.ca.gov/file/occguide/ENGCERAM.HTM
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re: Materials Science
That Rand Cam engine is pure genius. I was thinking of something like that a while back, but didn't come up with the missing pieces of the puzzle - the center part of the engine and the moving vanes.
Thanks for that post!
Thanks for that post!
re: Materials Science
The Rand Cam and some of its cousins:
Rand Cam
Ball Piston Engine
A.S. Hybrid Engine
Quasi Turbine
I've some across some of these guys before, but figured I'd collect them together and make a post. Not a complete list, by any means ...
I was interested in finding a diagram of the Janova engine, but came up dry (not that it was a diligent search).
Rand Cam
Ball Piston Engine
A.S. Hybrid Engine
Quasi Turbine
I've some across some of these guys before, but figured I'd collect them together and make a post. Not a complete list, by any means ...
I was interested in finding a diagram of the Janova engine, but came up dry (not that it was a diligent search).
Last edited by pezman on Sat Feb 25, 2006 7:59 pm, edited 2 times in total.