Quote from: mondrasek on September 21, 2012, 05:22:32 PM
Recorded data from a 3 layer (1 Pod, 2 Risers) single ZED as shown in previous photos and posts.  The input is a gravity fed funnel tube that enters the bottom of the Pod chamber.  A separate air line that also enters the bottom of the Pod chamber was used to achieve the set up conditions.  Set up was done to create the maximum lift potential along a stroke of 10 mm with enough lee way to barely allow for not blowing skirts.  The entire load (pre and work load) are very near the maximum of the "ideal lift" potential.

Lift mass is 1217 grams (digital scale accurate to  +/-1 gram).
Lift stroke is 10.0 mm (digital indicator accurate to +/- .01mm).
Input water mass is 74 grams (same digital scale and repeated several times).


The change in ZED stroke when the lift mass is removed or added when at the bottom lift position:  3.8 mm.
Head change in the fill tube for the same:  165mm  +/- 1 or 2 mm.

M.

Mondrasek,
Before you go into doing a hollywood movie production, can you tell me the following

1..  Do You start from what position, sunk = riser standing on the bottom (touching)
      or floating = a water gap between risers and bottom.
2..  At floating position what weight do you have on top of the risers
3..  With that weight what is your float pressure ( this can be in mm or inches head height measure at the bottom of the pod area, where you input or exhaust water)
I would imagine from the text that you are floating the weight up for 10mm is that correct ?

You mention a load of 2.5lb and a output weight of 1217gr for 10mm,
Please try to be clear what amount of "weight + load" you have on the riser at what time, also if you hold (stop) the riser.

Remember that from an energy viewpoint, pressure = distance and weight = volume
Do not read head height on the riser itself, this is not accurate enough to have meaning,  read it on the input/exhaust pipe

Clear sequential data will solve your performance question.

Michel

RS,

Sorry if I do not or am not able to answer all of your questions correctly.  I am currently in charge of the youngun and waiting for "Mommy" to return from an away trip.  I am also making sure the digicam has a charge and thinking through the video "production."

1.  The experiment started from the position of "sunk," but with the Pod/Risers in neutral buoyancy (floating) approximately 1 mm above the point where they would be resting on the annulus walls.  This was by design so as to keep the lift as close to "ideal" maximum as I could while making sure not to have the Pod/Risers sit down on the walls.

2.  There is a preload on the system that includes (from bottom to top) the Pod and Riser mass, a couple spacers (that include a partial roll of electrical tape and a plywood disk), a Cedar plank (to give a point for the digital indicator to read off of), a pre-weight (a Tupperware type container with some wet sand from the yougun's play table), and, finally, the Lift Load (a free weight disk marked at 2.5 lbs but that measures at 1217 grams on a digital scale).

The digital indicator is another portion of the pre-load.  It's induced mass was not linear due to the internal return spring so I removed that spring and only gravity is in play now.  Except for friction it is now a constant load during the rise/sink.

3.  I am not sure what measurement you want me to explain or take with this.  Please try again.

Please let me know if anything was not answered!

M.

Quote from: mondrasek on September 22, 2012, 01:40:22 PM
RS,

Sorry if I do not or am not able to answer all of your questions correctly.  I am currently in charge of the youngun and waiting for "Mommy" to return from an away trip.  I am also making sure the digicam has a charge and thinking through the video "production."

1.  The experiment started from the position of "sunk," but with the Pod/Risers in neutral buoyancy (floating) approximately 1 mm above the point where they would be resting on the annulus walls.  This was by design so as to keep the lift as close to "ideal" maximum as I could while making sure not to have the Pod/Risers sit down on the walls.

2.  There is a preload on the system that includes (from bottom to top) the Pod and Riser mass, a couple spacers (that include a partial roll of electrical tape and a plywood disk), a Cedar plank (to give a point for the digital indicator to read off of), a pre-weight (a Tupperware type container with some wet sand from the yougun's play table), and, finally, the Lift Load (a free weight disk marked at 2.5 lbs but that measures at 1217 grams on a digital scale).

The digital indicator is another portion of the pre-load.  It's induced mass was not linear due to the internal return spring so I removed that spring and only gravity is in play now.  Except for friction it is now a constant load during the rise/sink.

3.  I am not sure what measurement you want me to explain or take with this.  Please try again.

Please let me know if anything was not answered!

M.

Hi Mondrasek,

Woowh, I am starting to understand why the Aussi wants to have a movie,  I thought I was simple and clear in my request to what was required to ascertain the performance of your zed. I wasn't counting on the weight of such a selection.
Sorry, I am afraid I wouldn't be of much use in help to you.
Michel

PS: What does Mondrasek mean or stand for ?

M is for Michael.

ondrasek is for Ondrasek.

Slovak ethnicity.  But third generation American.

M.

@Red_Sunset. Hey , do not give up on Mondrasek so easily! I have known him, through this forum for many years, and, trust me he is one of the good guys, always willing to share. It would seem to me that he gave a full answer to the first two questions you asked. Why not try asking question three again, if necessary explaining exactly what you want to know in precise detail. The last thing we need at this stage is for the job to fall apart through misunderstandings.
     I could be totally wrong, but what I think you are asking is this.
With that weight what is the hight of water in your feed tube measured from the base of the pod chamber. Forgive me if I am wrong, my intentions are good.