Brilliant concept, but will it work?

[magneat]

Hello everybody !


as I see the device - 2 disks, located at some angle to each other.


each disk rotates on its axis.


N pipe pairs are fixed between the discs.


in each pair of pipes one slides inside the other through the ring seals (minimum - 2) with minimal friction.


from the other end these tubes are SEALANT, and fixed through the ball joints on their disks.


all pairs of pipes are connected together by flexible tubes for free flow of air - the pressure in all pipes is constant.


This design does not need side walls - it just needs to be immersed in water.


with respect.


p.s. sorry for my english - translation by Google Translate

[Low-Q]

I think the calculation for buoyancy is easy. Generally it is the volume in front vs the rear that counts. However, without the ends being inside the water, maybe the tubes aren't buoyant at all???
It should, somehow, be something that obeys conservation of energy in this device. So what is it? A "true" physicist would probably answer that question in a second, by saying that energy must be conserved.


I have twisted my mind, and will try to analyze the device this way (And hopefully get the sleep I need):
The volume that is submerged into water, is the volume that the pipes is displacing. So far so good.
However:
Since the wheels will shape a triangle, seen from above, there is greater surface area in front of the pipes than behind them. Since there is no ends to the pipe that is inside the water, the water pressure will push more on that side with the greater area - against rotation. Because the greater area is pointing towards the longest pipes, and the pressure is greater at the bottom. The correlations makes sense this far.
On the other hand, these pipes, as each of them might be more buoyant in front of them (because the front half of the pipe is lighter than the rear half) will also try to rotate WITH the wheel, in the right direction, and possibly cancel out the difference in the surface force between front and rear - I'm talking about each pipe separately.


As I write this, my printer is making parts for a device that is similar. Actually, I will make two models. One model with the bellows, and one replica of the device in the video. The drawback with these models, is that they are small with just a few grams of buoyancy. The flexible filament I use, do have resistance that will be hard to fight against. If I squeeze the material/bellow, it takes some time for it to recover into initial shape (and the first sample got destroyed due to poor print quality). The other drawback is the leakage in the other model, but that one will have much less resistance. Finding a model that have no leakage and little friction is something I'm working on.


Vidar

[ramset]

Well
your image in Post #4 seems to show not half but maybe 1/3 disparity between
up side and down side.
if we were using gravity instead of buoyancy the lift/weights [100 lb for example when "large"

potential of the wheel would be huge [fantasy land musings]

Yes open pipes but ...Hhmmm

going to have to ponder your Triangle [small side comments,hasn't sunk in yet]

Please forgive me if I post too much here,had eye surgery early this AM and can only look down for a week or two [during healing]
I appreciate the distraction and am totally smitten with all the whatifs

I promise not to make a pest of myself ,but will be doing lots of thinking


Chet

[Low-Q]

Here is the first bellow. Sloooow printing and 0.1mm layerhight did the trick.


Vidar

[Low-Q]

No problem Chet. Post as much as you want in this thread. Everything that contribute to solve this mystery is welcome