www.pulse-jets.com

Yeah, I was going to mention that efforts to obtain anhydrous ammonia is a good way to invite scrutiny. We're probably all under casual observation anyway. Whenever you try to explain the hobby, you can see people wondering if you're an evil mad scientist. On that topic, Bruce Simpson's $5k cruise m...

Horace,

How much are you envisioning selling the turbine wheel for?

Do you have any ball-park figure for the cost of a fully assembled engine?

Awesome work!

Blast Comprssion Valveless Pulsejet

Bruno Ogorelec wrote a nice review document about valveless pulse-jets that can be found here:
http://www.pulse-jets.com/valveless/index.htm

At the end, he proposes a blast compression idea that is pretty elegant.

Just remembered that SRL has film of an Argus clone that they built: http://www.srl.org/yard/ I think that they you can hear them saying on the film that they used more modern steel for the valves. Maybe they there's a chance of help from them to get jump-started? A lot of intricate fabrication in t...

A prolate ellipsoid (or prolate spheroid) is a stretched spheroid -- a.k.a an egg.

An oblate spheroid is what your basket ball becomes if you sit on it.

I think its a derivative of the Argus (plans here: http://www.pulse-jets.com/count/pulse.php?ID=28)

I hope this helps you to understand better.

Yeah, Larry, have you been enlightened yet ;)?

A nice starting point on the topic.

http://www.gexcon.com/index.php?src=han ... Bchap6.htm

Well, I think that the shock waves have a relatively short wavelength that are more or less like a thin shell expanding spherically. http://www.pulse-jets.com/phpbb2/files/shock_wave_leaving_tube_svort1_140.gif It should be possible to focus and aim these and make use of them -- BUT, the propogating...

Wouldn't your requirements describe a CC that is shaped like an egg?

Probably not a bad idea, btw.

edit: Just read more carefully -- not an egg. Has anyone experiment w/ "eggs"?

Cool idea! I think I may play with something like this. Here is a similar idea that I found a while back: http://conceptengine.tripod.com/conceptengine/id2.html It seems like a close cousin to your fly-wheel idea, although the engine in the above link converts thrust into rotary motion to drive the ...

Boom likelihood depends on the fuel. Some fuels have relatively wide limits of flammability (H2, Acetylene, Methanol etc.), others have fairly narrow limits (Propane, Gasoline (I think), etc.). That aside, a free-piston design that pumps the pulse-jet would be pretty cool. The resonant frequency of ...

There is nothing to inherently prevent combustion from occurring all the way down the tube. In fact, according to Tharratt, that's exactly what happens. Put enough fuel in the pipe, and it is guaranteed that a good bit of it will arrive at the end uncombusted. In addition, under the right conditions...

Nice puzzle. I figured it depended on the angle, so the result made sense after I saw it. On the other hand, I can;t make any claim that I wold have come up w/ an analytical result. I guess that the pencil is "almost certain" to touch the line when it is rotated +/- pi/2, and almost certain to miss ...

Hmm, I have something a little like this lurking down in my basement. As far as getting analytical information for designs, I think that modeling is hopeless, since the heat gradients in the engine cause the speed of sound to vary over time and distance. I'm pretty sure that you'd need a big-ticket ...