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Good to to hear from you again Tom Booth. I always hate to see close-minded haters try to shut down free thinkers. It goes two ways though; we need to make our points and move on, else we argue with the mirror. I done plenty of that.

I've been side-tracked for a while, but a bit of a progress report. I took this outside to test the burner and it was a smoky sooty mess even with the driest wood. I'll try an open-top insert to match the door width and narrow the burn zone. Hopefully the cooler incoming air will stay at the bottom ...

Vincent, as to the drop from expected 7psi to measured 4psi in your opening post, did you add around the displacer to dead-space? I'm sure it doesn't bottom or top out, and it's probably an annular gap type regenerator? As to that, without a proper regenerator, much more of the working gas temperatu...

I've never seen it explained well, and this probably won't help; but I'll take a stab at it: Visualize a single-crank-pin 90 degree V twin Alpha. Minimum volume is the crank centered at 45 degrees between the cylinders and maximum is 180 degrees further along, similar to tdc to bdc of a Gamma power ...

To be clear, I've never proposed that radiant transfer has any effect on clear air; in. fact the opposite. I've only said that I think radiant heating of a heater, and radiant cooling of a cooler, that would then conduct heat to/from the working fluid, could be very significant. Apologies for any mi...

A problem with the Beta is that changing timing changes the clearance between piston and displacer, so you'll need to allow for that in the different experiments.

Bumpkin

I googled that plan and it showed a smaller version with a 15 mm displacer and a 13 mm power piston. With the single crank throw and rocking beam design it looks like the stroke is the same for both. If your bigger version has a similar displacement ratio it would take a very high temperature ratio ...

I was gifted one of those peltier fans - "I Know you live off-grid and you'll just love this." It worked silently and reliably and pretty much uselessly. I either threw it away or it's stored away somewhere, I dunno. Not that they couldn't serve a purpose, but the best way to spread the he...

Welcome to the forum. Sorry to miss and not greet your introduction. Sometimes I'm here regular and sometimes not so much. Sounds like we have a lot in common as far as appropriate-tech independence, along with dreams of fostering community. I have genuine respect for true black-smithing. I tend to ...

Welcome Fusval. I've taken the liberty to share an english translation I found: I am determined to come forward and take an active role in this forum. I'm one of many people who are passionate about mechanics and lately I've been interested in these engines and all the engineering challenges they br...

I finally got back to this a bit. I got the fire-box door done. I think I’ll pick up a few extra lengths of stove-pipe next time I get to town so I can take it outside and burn off all the old paint and see how it draws. I’ve made a few wood-stoves and they’ve all drawn ok, but this one was made wit...

When I saw the above question, “How do you define heat?” I knew it wasn’t asked of me, but I thought: (As a noun,) Molecular motion duh. That “official” Britannica definition is too clever by half. If instead of “energy that is transferred,” they were to say “energy that has the potential to be tran...

I could diagram a 10/1 or maybe even a 100/1 compression Beta, but it couldn’t run without a 20/1 or 200/1 temperature difference. So there’s really not much point. It seems idiots are idiots — higher indoctrination just reinforces the bastion.

Bumpkin

Dunno if it relates and I can’t remember if it was this forum or somewhere else, but there was a conversation sometime back about how the roughness of shark-skin actually made it slicker. Yeah I know, hydrodynamics vs aerodynamics, but it might be relevant.

Bumpkin

Tom, thanks for catching my spelling error and correcting it; principal — principle, perhaps without even noticing. Maybe the principle was more important. Like you said, (paraphrased,) it’s probably not the sound of the hammer-strike that’s driving the nail. As in; if you really want to advance sci...