www.pulse-jets.com

Hi Mark, Happy '24! That paper was a good read. I think it suggests this works in a vacuum, correct? So, not a convection effect, but purely conductive, which makes some sense, where the heat bleeds out at the contact, which slightly contracts that side, which makes a teensy upward bow, that makes i...

I haven't talked to Larry. Happy '24!

What is the trick to getting geometry into the wave simulator? I've tried filled geometry and outlined, in jpg and png, gray and black. I just get a blue field.

That is fantastic! Can you please add the elliptical rotated 90deg? Then it will be my new screen saver! I’m particularly fascinated with the interference patterns. BTW, it will not be detonation, but maybe call it a locus of deflagration. I’ve always wondered if it helps or hurts to have these wave...

I think the best shape is elliptical, specifically a 45deg ellipse whose major axis is the CC diameter. At least, if the goal is making a flat wavefront according to my last message. Admittedly a very simplistic point of view.

Looking good so far. As to the parabolic or other shape to the closed end, I think a flatter wavefront coming off of some convex shape would be beneficial, and I've seen so many tries at that, with little evidence that it mattered. I think every designer goes there at some point. For my own work, I ...

I did. Mostly just work, though. I made a robot with a swingarm that would get a ball up to 100mph so we could get a controlled tick against an instrumented bat. The final verdict was, if the microphones there don’t hear the tick, it didn’t happen, but if they hear it, it did not necessarily happen....

Hi Vic, I would very much like to see that. Maybe start a thread in the Valved fora?
I enjoyed my time in Loughborough. Do you live thereabouts? I did some fun work for the Int'l Cricket Council at the National Cricket Performance Centre there.

Welcome, Alexander!

I’m thinking more like one rev per pulse on a smaller propeller, maybe.
Wonder if the snorkelers would work if bent over and trmendously lightened. Your 360g seems a reasonable weight budget without getting too crazy with materials.

360 grams is really good, I'm thinking.

My approach was making a pulsepot helicopterish thing, but I could not get it to sustain:
https://www.youtube.com/watch?v=mXgAOvkrOF4

Ha, Mark, spot on. The next one is a viscous shear type, and the deep dive has been how to compensate for viscosity change with temperature, and using liquids available three centuries ago, like ethanol. That approach has a chance of doability in the 1700's.

Here's what I've been working on lately, non-resonant timekeepers. And here's a paper I've written about it, some light bathroom reading!

Wow, that post is why I keep this trove alive! Thanks, Dynafogger!

Wow, that animation is top notch!