Finally I think I got it !

[hansvonlieven]

Hi all !

this is mod. of Gravitator's idea

green enbodyment is ponton-bridgelike heavy body, with characteristic that overall is lower density material than water
so it floats. call it moveable part MP

1. air presassure created by gravity on MP makes water climb and fills container.
2. valve on MP opens (in and out valves on container are now closed)
3. since MP has lower density than water it is pushed upwards by boyancy.

totaly clean, can be used to generate electricity, hydropower plants (but without devastating ekosystem)...

mechanically not so complex to produce -  (maybe to us - low/no money-time-labspace-equipment guys)
If someone who is genearting energy/money crysis and polution, would really give a fuck, building this is easy as cake.
Of course we would give them and did even better solutions.

Wiz

In order to create the syphon effect the weight MUST be heavier than water, so it cannot rise.

For every cm of riser tube the weight must create a pressure of 1 gram, so if your riser tube is 1 m high the negative pressure at the top must be greater than 100g/cm2 Since water has a specific gravity of 1 that means that the weight has to be heavier than water and therefore will not float.

The same applies to Alan's device.

Both devices cannot be compared to the drinking bird since the drinking bird is a heat engine that relies on vapour pressure.

Hans von Lieven

[sushimoto]

Everything will be relative. If you have a 2.5m dia. tank, then the top tank with the weight will be big also, and the filling of the top tank will require alot of water movement that will be relative also. Air bubbles are made in all sizes, some big but also some very small that can stay suspended and enter the riser tube. Also, if this is outdoors and you want the device to be wind proof, I would still put that tube underwater.

Agree. There is no need for open falling water.
So lets lengthen the outlet tube at V2 inside the tank...

where's Gravitator or wiz to further evolute his drawing and idea?

@Hans.
its just a little brain jogging in theories and for recreation. Not tooo serious

[spinner]

In order to create the syphon effect the weight MUST be heavier than water, so it cannot rise.
....
Hans von Lieven

This sentence describes the main problem perfectly. That's why such setups cannot work.

[tbird]

Hi all !

this is mod. of Gravitator's idea

green enbodyment is ponton-bridgelike heavy body, with characteristic that overall is lower density material than water
so it floats. call it moveable part MP

1. air presassure created by gravity on MP makes water climb and fills container.
2. valve on MP opens (in and out valves on container are now closed)
3. since MP has lower density than water it is pushed upwards by boyancy.

totaly clean, can be used to generate electricity, hydropower plants (but without devastating ekosystem)...

mechanically not so complex to produce -  (maybe to us - low/no money-time-labspace-equipment guys)
If someone who is genearting energy/money crysis and polution, would really give a fuck, building this is easy as cake.
Of course we would give them and did even better solutions.

Wiz

hi,

with the upper tank full and v1 closed and v2 opens, no water will drain.  you have to have a vent to air.  but of course for the suction to fill the upper tank, it will have to be closed.

tom

[tbird]

In order to create the syphon effect the weight MUST be heavier than water, so it cannot rise.

For every cm of riser tube the weight must create a pressure of 1 gram, so if your riser tube is 1 m high the negative pressure at the top must be greater than 100g/cm2 Since water has a specific gravity of 1 that means that the weight has to be heavier than water and therefore will not float.

The same applies to Alan's device.

Both devices cannot be compared to the drinking bird since the drinking bird is a heat engine that relies on vapour pressure.

Hans von Lieven

hi hans,

even though the weight is heavier than the water being syphoned (in the tube), couldn't it displace more than it weights with a hollow extention?  it might shorten the stroke, but couldn't it then float?

tom