Odds and ends

[Mark]

Maybe in a vague way, this external combustion engine could be said to be snorkeling.
Thermoacoustic Puffer Test
https://youtu.be/UaIc077eJWc

[Mark]

Thermoacoustic Fan
https://youtu.be/LP7HbR-R-X4

[Mark]

A few simple hot air engine variations toyed with recently ...
https://youtu.be/7LKlVNzUqts
https://youtu.be/kXn90VcrEt0
https://youtu.be/oDmC-wECzMw

[Mark]

I liked this one I made, just two test tubes inside a larger tube.
https://youtu.be/EosXGSEvkuU

[tufty]

That's beautifully simple, Mark.

[Mark]

Here's a smaller version I was fiddling with, a little fussy sustaining but just started toying with it so maybe I can get it to do better later on.
Testing a Tiny Culture Test Tube Stirling Free Piston Engine
https://youtu.be/LhLkJsuyXCw
https://youtu.be/trCiuU69YcE

[Mark]

Got it to run for about three minutes but only started the camera after deciding it was going to sustain. Still I have to wonder why it decided to stop after 3 minutes .
1.3 Gram Test Tube Piston with Longer Run Time
https://youtu.be/GRZMBTAVbso

[Mark]

These are 6 mm borosilicate test tubes oscillating in an 8 x 6 mm quartz tube, a vertical test. Funny by adjusting the freedom of the stroke with the silicone rubber band you can hold the engine in yor hand and it's impervious to motion and yet most times it likes a solid table surface to resonate on, to keep the rhythm. Like here on this flimsy table, the flexing dampens feedback. Notice how smooth it runs once it settles down.
https://youtu.be/R7FXZXtoHfk

[Mark]

First Attempt of a Springbot Free Piston Stirling Engine
https://youtu.be/oLc2mjLKV2c
https://youtu.be/Tgrim7z7A2k

[tufty]

Those are absolutely mental, Mark. Proper made me grin.

[Mark]

An odd thing I tried to play ...
Rudimentary Thermoacoustic Walking Cane Flute
https://youtu.be/v22bJsGKOF4

[Mark]

Kind of an interesting shape with no seams.
https://gourmetkitchenworks.com/collect ... lly-500-ml

It's the same volume as this Erlenmeyer Flask jam jar jet I ran.
https://youtu.be/mDrdUy-LWHY

[Mark]

I made a simple Stirling jumper that was fun to finally get working.
https://youtu.be/A-ADjLDZw8k
https://youtu.be/L78ogEqdQVA

[Mike Everman]

Honestly, that is so cool, Mark!
Hope all is well, man. Looks like you are still having fun.
I am absorbed by clockwork these days, but never stop thinking pulsejetting, really.

[tufty]

That's really nice, Mark.