Dart threadwheel skimmer build
- Thread starter smjtkj
- Start date
Hahn I will have to politely disagree with this too! I have experimented with different sized needles for the Tiny Might
and can tell you first hand that different pin configurations as well as pin sizes changes the bubble size and the amount of air that the pump takes in.
Mike
i am sure you have more experience and knowledge then me and i am not argue with you. but i try the eheim pump , i try the sedra pump and i try the gen x pump with the regular impeller compare to the mesh from all my test all the pumps with the mesh create more bubble and pull more air. (i don't care about the air) what those pump skim with the mesh material they never skim with the regular impeller . for example my old sedra pump pull about 3 l/min with the original impeller when i test the mesh the pump pull 10-12 l/min the gen x pump pull with the regular impeller 12-14 l/min when i compare the pump: the old sedra skim better then the gen x pump with the regular impeller (leave the air at the side) the pump creat more bubble and foam then the gen x pump. and i think that this is the point to get more foam and better skimming result in the collection cup. there is another nice things with this mod that you can skim any way you want dry or wet and it's not stop to make foam . the bubble can be like what you want and how you play with it (it will increase the watt but you can play and optimum that) with the regular impeller the bubble will be almost the same . with the mesh when you turn on the pump and the skimmer start to work even it's not steady in the begin you see immediately the foam start to build in the skimmer body.
again all the test that i make was on ER CS250 and i have never have or see the same result on my skimmer with the regular impeller.
mike now play with the skimmer he going to see it to.
Last edited:
Charlie Davidson
New member
tag 
spazz
New member
<a href=showthread.php?s=&postid=8397390#post8397390 target=_blank>Originally posted</a> by Charlie Davidson
tag
there is a link at the bottom of every thread that will let you subscribe to a thread with out putting "tag" in a post. it will send you an email every time someone post something new to a thread. putting "tag" in a post and nothing else it gets moderators upset and make threads longer for no reason. some of these threads get so long it take days to red them. and putting"tag" lines in there just makes it worse.
hahnmeister
In Memoriam
Hey smjtkj and Magvi, Im not saying that needlewheels dont serve a purpose. I said that I dont think that varying the design if a needlewheel is going to change the average bubble size of the output, thats all. Needlewheels and their like do increase the throughput of air/water... as in, they are able to handle the air water mixture that comes into the pump much better than a regular bladed impeller would. The multiple smaller surfaces act to break up the air bubbles so that there are no large pockets of air disrupting the flow inside the pump, like with a regular impeller. If the pump took in a pocket of air, and then that pocket were sucked into the pump when it hit the impeller blades (if it doesnt bypass it) it would make that surface less effective at drawing more water and air into the pump. But with a needlewheel, the air pocket gets chopped up finer so that the pump can handle larger 'chunks' of air on a conatant basis and not have it disrupt its throughput. But in observing the inside of the needlewheels in action, alot of air can bypass the impeller all together, going right from the intake to the output of the pump in large chunks. At this outer ring, before the mix exits, the larger bubbles get smashed into smaller bits by the other bubbles. Im not saying that needlewheels dont have their purpose to increase performance, but I think its more related to throughput than bubble-size.
hahnmeister
In Memoriam
For example... look at what happened when Bean tried to open up the outlet on his Oceanrunner... larger bubbles...
http://reefcentral.com/forums/showthread.php?s=&postid=8399404#post8399404
"I just did some work with the dremel on the pumps exit surfaces... the bubbles are worse (larger) not better. The pump was capable of about 24 SCFH before larger bubbles started to pass through... now about SCFH is the limit. All I did was to slightly open up the output area of the OR3500. "
-Bean Animal
http://reefcentral.com/forums/showthread.php?s=&postid=8399404#post8399404
"I just did some work with the dremel on the pumps exit surfaces... the bubbles are worse (larger) not better. The pump was capable of about 24 SCFH before larger bubbles started to pass through... now about SCFH is the limit. All I did was to slightly open up the output area of the OR3500. "
-Bean Animal
hahnmeister
here some picture on the bubble of this skimmer .
first one after i clean the skimmer :
[/URL][/IMG]
here big bubble
[/URL][/IMG]
here more smaller
[/URL][/IMG]
here very tiny bubble
here it's the skimmer body
[/URL][/IMG]
and this is after some hour
[/URL][/IMG]
the different between this tweak change my gen x pump between 47watt open wide till 67 watt smaller bubble.
with the regular impeller it's 60 watt.
in all this mod the skimmer pull more foam then the regular impeller and what you see in the picture (in the collection cup) take me about 1 day with the regular impeller.
here some picture on the bubble of this skimmer .
first one after i clean the skimmer :
here big bubble
here more smaller
here very tiny bubble
here it's the skimmer body
and this is after some hour
the different between this tweak change my gen x pump between 47watt open wide till 67 watt smaller bubble.
with the regular impeller it's 60 watt.
in all this mod the skimmer pull more foam then the regular impeller and what you see in the picture (in the collection cup) take me about 1 day with the regular impeller.
Charlie Davidson
New member
Thanks for the info spazz - blind I guess-never saw that 
Hahn, I opened the exit on a 3700 when I first got it from Rufio a few years back (John) but I also opened the suction side.
IMHO , spoke wheels create smaller/finer bubbles than pin-wheels. (set up as feed pumps)
Hahn, I opened the exit on a 3700 when I first got it from Rufio a few years back (John) but I also opened the suction side.IMHO , spoke wheels create smaller/finer bubbles than pin-wheels. (set up as feed pumps)
<a href=showthread.php?s=&postid=8399924#post8399924 target=_blank>Originally posted</a> by jnarowe
well, you guys are getting me jazzed! I would like to know about the material you get for the larger pump. I will be experimenting with my Sequence 4300 and that thing has got some HP.
here you can compare between the 2 (it's the pf13) twice thick then the pf5 .i believe it will work better on the big impeller .
and i forgot before this is the foam on the top of the collection cup
Similar threads
