Search found 83 matches

by Stuart
Tue Apr 18, 2006 5:41 pm
Forum: Valved pulsejet forum
Topic: Pulse jet silencer?
Replies: 18
Views: 17933

Re: re: Pulse jet silencer?

Tribal knowledge will tell you that it won't work on a conventional PJ. The exhaust pipe needs an open end to function; one that does not diminish the pressure pulse. That's not to say that you can't get some muffling before you move it too close and it kills. Augmenters are the best you can do, th...
by Stuart
Mon Apr 17, 2006 10:43 pm
Forum: Off topic forum
Topic: Titanium Weirdness
Replies: 13
Views: 5215

Re: re: Titanium Weirdness

Stuart, I think the temperature is low enough for it to be ok for conrods and pushrods. It seems a common thing to do is nitride the surface which increases its hardness and prevents the oxidation. Billet titanium rods are quite common though. Oh, I'm sure con rods are great in titanium, it was rig...
by Stuart
Tue Apr 11, 2006 11:20 pm
Forum: Off topic forum
Topic: Titanium Weirdness
Replies: 13
Views: 5215

Re: Titanium Weirdness

Anyway, I just thought this would be an interesting thing to report. It turns out that even Ti alloy (at least THIS alloy) would be pretty poor as a structural element deep inside a pulsejet. Note that this effect was the result of seconds of exposure to the engine gasses, not minutes or hours. L C...
by Stuart
Mon Mar 27, 2006 6:51 am
Forum: Tools and Construction
Topic: Aluminum combustion chamber
Replies: 4
Views: 2469

Re: re: Aluminum combustion chamber

allright well I guess I will have to go ahead and roll a combustion chamber cone out of steel. Has anybody ever calculated what type of force is being exerted on the walls of the chamber? Most pulsejets are showing a peak to trough fluction of 2 atmospheres (30 psi. Most failures that have been doc...
by Stuart
Sat Mar 25, 2006 3:28 pm
Forum: Tools and Construction
Topic: Electronic fuel injection Help please
Replies: 17
Views: 9535

Re: Electronic fuel injection Help please

Hello everyone. Also I was thinking about using an air hose to pressurize a container full of fuel instead of using an electric fuel pump, but I'm a little concerned that it might just turn into a big grenade, and I want to be safe. Oh... the thougt occured to me to use some sort of plastic bag to ...
by Stuart
Fri Jan 20, 2006 5:47 pm
Forum: Valveless pulsejet forum
Topic: A Rainy Day Makes for Inset Intake Success
Replies: 15
Views: 6143

re: A Rainy Day Makes for Inset Intake Success

To add to what I just said, if the inlet is too long, you don't get an eddy current, but you do get a capacitance. That's why the front end of your pjet is cold. Draw what you thing the flow looks and you'll see what generally is the case is that you want close to an integral step, just like the vor...
by Stuart
Fri Jan 20, 2006 5:14 pm
Forum: Valveless pulsejet forum
Topic: A Rainy Day Makes for Inset Intake Success
Replies: 15
Views: 6143

Re: re: A Rainy Day Makes for Inset Intake Success

I just don't see a "node" situation, within the combustion chamber itself. And this means that moving the end of the intake around inside the CC isn't going to change things a lot. Again, any other opinions? Bill H. Acoustic Propulsion Concepts ".......some day soon we'll be flying airplanes powere...
by Stuart
Thu Dec 29, 2005 3:56 pm
Forum: Off topic forum
Topic: Flying Spaghetti
Replies: 19
Views: 7567

Re: re: Flying Spaghetti

Point 14 was... "In the recently concluded Scopes-like trial of Kitzmiller vs. Dover School District, one of the defendants claimed not to know the source of the funds for 60 copies of an intelligent-design book, which he admitted to only having glanced through, for the school library. He was then ...
by Stuart
Thu Dec 29, 2005 3:40 pm
Forum: Off topic forum
Topic: Contact Bruce Simpson ??
Replies: 30
Views: 12403

Re: re: Contact Bruce Simpson ??

But, it's not enough to get him off the hook. As that USA official said, "Mr. Simpson was playing with fire..." He got burned pretty badly. He should have known better. He should never have done the missile thing. Everyone knew it at the time but him. Bruce is a horses ass as far as I'm concerned a...
by Stuart
Mon Dec 26, 2005 6:32 pm
Forum: Tools and Construction
Topic: Materials Science
Replies: 42
Views: 21620

Re: Materials Science

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/
Thanks for the link. I've been looking for a source. I've been using some header heat wrap.
by Stuart
Thu Dec 22, 2005 3:25 pm
Forum: Off topic forum
Topic: World Jump Day
Replies: 16
Views: 7491

Re: World Jump Day

I calculated one time that if the earth were the size of a basketball, Mount Everest would rise to the dizzying height of .003 inch above mean sea level. Verification of this figure will be left as an exercise for the reader. L Cottrill That was always my problem with the global warming nuts (not t...
by Stuart
Mon Dec 19, 2005 4:08 pm
Forum: Tools and Construction
Topic: Liquid fuel aerosol techniques
Replies: 11
Views: 4538

Re: re: Turboprop PJ experiment update

Yeah, Jonny, that's what I want to do, make an atomizer that uses propane as the driving gas. Like an air-brush tip or other paint sprayer. Maybe a smallish propane cannister could be talked into delivering quite a lot of gasolene. Yes, I think that is really a practical way to go, especially if th...
by Stuart
Sat Dec 17, 2005 4:29 pm
Forum: Ramjet forum
Topic: Increasing tipjet economy
Replies: 2
Views: 2659

Re: Increasing tipjet economy

The tipjet (ramjet version) method has been generally frowne upon due to the poor fuel economy. My question is this: Would it be possible to spin the ramjet faster than Mach 1? Here's the idea. -Don It's possible, but you are fighting a number of problems. One is that the centripetal acceleration i...
by Stuart
Sat Dec 17, 2005 7:13 am
Forum: Valveless pulsejet forum
Topic: AS-1 Inspired Weld-less Kazoo
Replies: 11
Views: 5113

Re: re: AS-1 Inspired Weld-less Kazoo

. I made a couple of simple rigs for home, though, let's see if I can find photos. Basically some wood and a bottle jack you can get for under $20 at home despot. Thanks for the pics. I don't have access to a press, so I do my pipe squashing with a sledge. It isn't pretty. You've given me some ideas.
by Stuart
Fri Dec 09, 2005 10:01 am
Forum: Valveless pulsejet forum
Topic: A New Friend and a New Lady
Replies: 39
Views: 28082

Re: re: A New Friend and a New Lady

Hi Ed, I can offer just one piece of info. The colour of the flame indicates its temperature. I can't remember the exact figure now, but lets say its about 2100K If the intake temperature is 300K, then the combustion raises the temperature by a factore of 7:1. If it burns fast enough to achieve thi...