Search found 613 matches

by pezman
Wed Sep 19, 2007 1:36 am
Forum: Valveless pulsejet forum
Topic: 50 lbF 'Lady Astor' Not For Beginners
Replies: 184
Views: 62147

Gigantor lol

It would be cool to buy one of those cheesy sheet-metal "Knight in armor" statues, replace the legs with two of those jets and make the scene at "Burning Man".
by pezman
Tue Sep 18, 2007 4:39 pm
Forum: Tools and Construction
Topic: Scilab
Replies: 2
Views: 2565

Something about diving in with both feet ...

... reminds me of the old George Carlin "head on from the rear" line ..
by pezman
Tue Sep 18, 2007 3:35 am
Forum: Tools and Construction
Topic: Scilab
Replies: 2
Views: 2565

Scilab

Has anyone used this? I just downloaded the software from here:
http://www.scilab.org/

I was thinking that it might be practical to move the NuDIS solver to Scilab (wasn't the original solver code done in MATLAB).
by pezman
Tue Sep 18, 2007 1:41 am
Forum: Valveless pulsejet forum
Topic: Ceramic matrix composites
Replies: 6
Views: 2903

Ceramic cloth pj

Wow, if you could knock together one of the more advanced FWEs (with expanded tail) or an advanced chinese using that material you'd be on the who's who in pulse-jets list. I think that the difficulty of obtaining the material and the almost inevitable expense of learning the technology through tria...
by pezman
Sun Sep 16, 2007 2:22 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1715
Views: 319541

Yet another PJ Lighting idea ...

I was reading stuff in connection with the recent discussions about ceramic pjs and platinum and such and ended up reading about limelight on Wikipedia. That got me to wondering whether you could use a pj to heat up a chunk of calcium carbonate for lighting purposes. My understanding is that this wi...
by pezman
Fri Sep 14, 2007 9:39 pm
Forum: Valveless pulsejet forum
Topic: Ceramic Lady
Replies: 78
Views: 38787

Carbon structures for thermal protection

Mike Everman posted some links on the topic here: http://www.pulse-jets.com/phpbb2/viewtopic.php?t=4468 Apparently just flowing alkanes through a structure at 1100 C or so will cause them to crack and leave carbon in the fiber structure. I guess the carbon kind of sinters on to the structure? I gath...
by pezman
Fri Sep 14, 2007 7:38 pm
Forum: Valveless pulsejet forum
Topic: Ceramic Lady
Replies: 78
Views: 38787

Rock wool Rocks! (not!)

faaaaascinating -- kind of an "ashes to ashes" thing That is interesting, since its parent material melts at a pretty high temp. According to thei Wikipedia article (link below) it is manufactured at about 1600 degrees C. Most stainless melts at about that temp. In all likelihood, the rock-wool is t...
by pezman
Fri Sep 14, 2007 5:37 pm
Forum: Valveless pulsejet forum
Topic: Ceramic Lady
Replies: 78
Views: 38787

An rather than glass wool ...

How about rock-wool ...
by pezman
Fri Sep 14, 2007 5:33 pm
Forum: Valveless pulsejet forum
Topic: Ceramic Lady
Replies: 78
Views: 38787

One of the great advantages of ceramic combustors (maybe)

Per simon's discussion on the various thermal stresses on a ceramic components. While most ceramics seem to be a little more susceptible to thermal shock, they do have the great advantage that they can tolerate incredibly high temperatures, which I think introduces the option of insulating the struc...
by pezman
Tue Sep 11, 2007 12:05 pm
Forum: Off topic forum
Topic: Nature's Children
Replies: 697
Views: 182528

Perception and its influence on self

At least once I have had the situation where I caught sight of myself in a reflective surface that was angled in such a way that it initially looked like I was part of a group of people that were walking in the opposite direction (i.e. I appeared to be just another of many strangers headed my way). ...
by pezman
Tue Sep 11, 2007 11:50 am
Forum: Ramjet forum
Topic: Ducted Ramjet that is meant to fly.
Replies: 35
Views: 24723

Cork!

Kent, Udda man! This thread may have actually solved a construction dilemma that I had -- I am installing a ceiling that is very thin and which needs to be insulated w/ foam. Foam needs a fire-retardant covering. Most people use wall-board, which I detest. Cork may just be the thing! Not exactly a r...
by pezman
Thu Sep 06, 2007 9:37 pm
Forum: Valved pulsejet forum
Topic: Valved Reynst
Replies: 65
Views: 28820

valved reynst

Hey, that's pretty cool and it just might work.

It is more-or-less the same idea as a fog-horn, only in reverse. In fact, it might be possible to build one of these from a fog-horn -- I think that the diaphragms are often metal.
by pezman
Thu Sep 06, 2007 5:28 pm
Forum: Ramjet forum
Topic: Ducted Ramjet that is meant to fly.
Replies: 35
Views: 24723

Ok, now I'm really impressed

That's quite an impressive list of technology trials.
by pezman
Wed Sep 05, 2007 10:39 pm
Forum: How to improve this site
Topic: Cornfield forum please Mike:)
Replies: 8
Views: 6009

Mike's cornfield

Actually, the phrase has special significance when you utter it, given your godlike administrative powers. In fact, I was thinking of pointing out the fact that that it was a highly self-deprecating phrase, given your role, but then I noticed tops of the corn-stalks gently waving in the distance, an...
by pezman
Wed Sep 05, 2007 10:30 pm
Forum: Ramjet forum
Topic: Ducted Ramjet that is meant to fly.
Replies: 35
Views: 24723

Refractory linings

Reading between the lines, it sounds like your refractory lining was one-piece? As you pointed out, the differing coefficients of expansion are bound to lead to problems However, glued-on tiles might work (kind of like an inside-out space shuttle). You probably would need to cover the voids between ...