Hydro Differential pressure exchange over unity system.

[wildew]

Hummm .....

I'd actually like to see the results from Mond and Wildew on this. If you set up your system at bottom with all vents open, and allow the water levels and air pressures to equalize fully at ambient pressure, then close all vents and proceed to apply the lift input... what then?

That actually sounds like a reasonable request. I have a door to trim first, but since i start all setups that way, why not. I'll just have to play with the weights a bit to find a load and base that will operate in that range.

All I add from that state is air anyway - to increase the differentials and increase the lift capacity.

Gimme an hour or 2
Dale

[TinselKoala]

And as long as you are making request, here are a couple for you.

I have posted data that graphs beautifully.  I'm not sure if you are one of the other two (I dl'd once at work) that downloaded and checked that out or not, but it is sweet.  And exactly as one would expect.  I'd actually like to see your interpretation.

The weather is clear and dry right now so I'm doing some astrophotography and only posting between running back and forth to the telescope. I'll be taking a look at your data when I'm done, or the sun comes up, or something. Right now I just finished processing an RGBL image of the Dumbbell Nebula in Vulpecula, and I'm getting ready to go out and start up the scope for tonight's shooting. So I'll be occupied for a bit.

I have also posted calculations from that data on how two ZEDs should perform and wonder if that conclusion is correct and somewhat accurate.  I'd actually like to see your opinions on that as well.

Sorry for being terse.  I'm a bit pissed off about the lack of attention to real testing going on.  So it is not personal.

Also pissed off about the lack of a spell check button...

M.

Are you terse? No probs, bro. Some people actually do have other hobbies than this one, though.... Believe me, I pay attention to your reports, they just sometimes get bumped to a lower energy level in the stack, temporarily.

Doesn't your browser have an inbuilt spellchecker? Mine does, at least something is putting all those squiggly red lines underneath "airplane" instead of "aeroplane" for me.

You can so equalize your air pressures and water levels. All you need is some thin tubing. Take some insulated wire and strip off long pieces of insulation. or Go to the hobby shop and get some Teflon CA application tubing. or Turn the whole thing upside down, separate the halves and put water to the same level in all chambers, reassemble and turn back over. I don't know if that latter one will really work. But certainly you can equalize your pressures at ambient  with some leeetle beeeety tubes. Or you can drill holes in your top plate and use tiny corks to plug them after you've leveled off your waters. Of course you seal everything just like a "normal" zed, you are just starting with no precharge.

[TinselKoala]

Hummm .....That actually sounds like a reasonable request. I have a door to trim first, but since i start all setups that way, why not. I'll just have to play with the weights a bit to find a load and base that will operate in that range.

Uh..... no, that's not the idea. You need to compare the performance of the system using the same "load and base", whatever you are calling your moving parts. You can't go changing the load to find something that works and then call that a comparable lift! The point of my proposed experiment is to see how much of the preload is working to offset the weight of the lifted parts. If you take the spring out of the 300 pound automatic bollard.... and then replace the bollard itself with a lightweight paper shell, and find that it's as easy to lift as the complete bollard was before.... what have you "proven"?

All I add from that state is air anyway - to increase the differentials and increase the lift capacity.

Gimme an hour or 2
Dale

All you add from that state is Air .... pressure.  Take your time, do it right, have fun.

[wildew]

That was actually a pretty interesting test - for a few reasons.
1. A few valves arrived in the mail today so I re-attached the board - and now I can easily lock it out.
2. It's easy to repeat - no setup
3. Something interesting showed up in the outer layer - it reversed for a bit
4. It still pushed the numbers up - first in - last out
5. It repeated through half a dozen cycles - no leak !

Not bad to set up - at these low pressures I used the actual riser and support for the base weight and the "fat" 5Lb brick for the lift - worked pretty well.

One note to newcomers - casual observers - others ....
This was NOT a recommended setup - it's actually pretty bass-ackwards, but a rather interesting base-line that might serve to demonstrate what can be accomplished by rearranging things a bit...

I used Mondrasek's format but added a column for the POD height.

Dale

[wildew]

All you add from that state is Air .... pressure.  Take your time, do it right, have fun.

I don't know about the fun part - sometimes my "fun" is doing something less challenging - like taking an ultralight for a 30 mile jaunt on a dead calm afternoon.

But I also like to be challenged -sometimes.

"All I add is air pressure" - yes. But it completely changes the system.
Not JUST because of the air pressure - but what that air pressure does to the rest of the system.

It has a direct impact on the hydraulics - minor - the greater impact is in what it does to the higher density fluid.

One of us is wrong
I have a long history of being both right and wrong, I totally accept being a blithering idiot at times.

Hope you have a clear view of the night skies
Dale