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That brick thing... I've been thinking about the nature of art, the position of artist etc. for ages. Finally, I came to the conclusion that art is in the eye of the beholder. What does that mean? It means that the artist has more or less no say in this. His view is almost irrelevant. It is you and ...

I have found this on the web. The author is unknown and the poem apparently quite old.

We the willing
Led by the unknowing
Have done so much
for so long
with so little.
We are now qualified
to do anything,
with nothing.

Damn you, Viv, don't just whet my appetite and then leave me hungry!

And yes, happy birthday!

You're getting older by the day. At this rate, you'll catch up with me soon.

If it's any help, the best valved pulsejet I have ever seen had a similar combustion chamber form. Big long diffuser to the combustion zone and an abrupt rear end, with no nozzle for the exhaust, just a pipe exiting the chamber from a flat rear plate. I had seen the design in preparation, before it ...

What you certainly need is an estimate of the flame propagation speed in the combustible mixture. I would say the combustion starts the moment the charge speed drops below that speed. By the time the sped drops that far, the charge has already mixed with the retained gas in the boundary layer and in...

Wow! What a place. I could camp there for a couple of weeks. I wet my pants on the Beriev amphibious flying boat. Spruce up its interior to make it livable... Wouldn't it make the most fantastic rich man's flying yacht ever? The helicopters were less pleasant. One of those was pursuing me not so lon...

Ka 56 is one of the most interesting small helicopters ever. Kamov is a hugely experienced and capable helicopter developer, so that I have no doubt that the little machine would have been an excellent flyer. Unfortunately, they could not procure a suitable engine at the time and the thing never fle...

No idea, but the rotational movement you mention is called a 'trapped vortex' if I am not mistaken.

Sure does, ha-ha-ha-ha.... Al Belli will also laugh, I guess. He was the one who built and tested my old 'swirl can'. We were supposed to progress to pairing two of them to a common recirculating constant flow intake and exhaust. The whole thing was supposed to be a constant-flow, constant-pressure ...

Bruno, since you liked the plot above so much, here is one that is more useful. (...) I believe eventually I'll be able to take a sound file of a running motor and figure out where segments are on it by moving the sliders to the relative intensities I see in the file, and reading the geometry this ...

You may want one, but the turbofan that will do the job of the old Williams is likely to set you back at least 50 grand today. It's basically the same one that powers a number of modern cruise missiles. It cost about 30 grand ten years ago, when everything was drastically cheaper.

this combustor you are attempting must have the entire duct. Remember that the pressure anti-node is there because of traveling waves that each make 2 full trips along the duct before conditions repeat. Ahem... Mike, every duct is an entire duct. There ain't no such thing as half a duct. What you p...

The frequency will naturally be pretty high, because the impedance of the pipe is so low. Ha-ha-ha... maybe the frequency will be pretty low. Larry, I think a combustor of this kind is too short to self-sustain acoustically. A longer combustor is a home to a number of waves that reinforce each othe...

the 'mounting' brackets seem rather complex for just mounts - any ideas? Vibration damper mounting. It is probably not rigid but allowed to slide a fraction of an inch forward and backward. Probably attached to a damper of some sort or just a flexible rubber block. Saves the missile from cracking b...

Lack of flow was not a problem, containment may be the larger issue. Only about 1/3 the flame stays in the engine, the other 2/3 flame is charring the surrounding area. Joe, it is not an issue of containment. Flames go some considerable way out of the intake on a 'normal' Lockwood, too. Intakes alw...