danner intake??
 

Has anyone ever tried cutting the little stream divider nipple thing, out of the inside of the intake a danner? So then it would just be a threaded intake pipe right to the impeller. It looks to me like that little nipple is for filtering.? Maybe this would also solve the pressure problem. Any thoughts appreciated....:p

i think its there to move water away from the center of the impeller, to the impellers blades. i woundnt remove it...

Sorry for digging up an old thread, but nobody has pointed out that this would be a very bad idea. That nipple thing is not there for water flow or filtering. It supports one end of the ceramic shaft that the magnet and impeller ride on. If you were to cut it off, the shaft would have nothing to ride on and the pump would be worthless at best.

just another reason why i dont think anyone puts any thought into designing pumps these days. sure its got a powerfull, magnetic driven, microprocessor controled motor, and it got 200ft head and does 30 gazillion gallons a second, but its still a bad design.

When the water enters the pump, it gets pushed out in all directions by centrifugal force, but there is only one small area where it is allowed to escape. sure its allowing the same amount in/out, but its flawed.


Okay, if you have ever seen the inside of a basic magnetic driven pump you should understand what i mean...

instead of having the ceramic shaft held at each end (makes it move too much imho) have it held at the bottom in the convensional way, and then have it held *behind* the impellar, where it comes out of the motor housing, then on top of that have the impellar as usual, but with a "nose cone" on it, in the middle, about half the height of the impellar itself.

the inlet to the impellar blades should be funnel shaped, but made so that it fits over the nose cone, and has about half the width of the nose cone space each side of the nose cone for water to flow into.

now, four outlets, all merging back into one at equal length from each outlet, they should be slightly shaped so that as the water is flung out and round its gets scooped up by a lip on the edge of the outlet, and then using a curved channel to minimise the loss of centrifugal force, it should be merged in with the other three.

I spent about 6 months in summer 2001 between school and college making this, and the pump i chose to rape was from my dads aquarium. it put out 600l an hour before i modded it, afterwards it was putting out nearly 1000l an hour!

it leaked like a seive and eventually burnt the motor out due to my poor manufacturing skills and the fact i managed to fill it with metal filings at least 3 times.

not only that but the only tools at my disposal were a hand drill, one drill bit, a blunt junior hacksaw and a incredibly empty wallet.

i dont feel that this design would be viable for mass production, and even if it was, would anyone want to trust a unproven design?

Uh, they put plenty of thought into it. The thought was, "What design allows for the least number of plastic pieces and the least amount of assembly, so we can sell it for around $50?" If you want a better pump, buy a better pump. Its a darn fine pump for $50 bucks.

$35. 100 in Canada.

What? You mean something like this? The impeller sits atop the ceramic "ball". The impeller is held in place by magnetic force. The impeller is actually designed to "rock" slightly on the cermaic ball to allow for large particles to pass if they happen to get inside the pump, but basically it stays centered through magnetic force.

http://www.employees.org/~slf/d4/d4-1.jpg

http://www.employees.org/~slf/d4/d4-2.jpg

Actually the pump is only $40, sorry i was guessing at the price earlier.

http://www.reefgeek.com/

Is that the new DangerDen pump?

damn, those guys think of everything :D

its is very close to my design Cathar, i was only 16-17 and had no clue what i was doing at the time, so it is quite an improvement.

I still dont get why pumps designed specifically for systems that wont have any particles, rocks, or stray submarines in them still have to use a impellar that either moves or has gaps around it for them...

Name one pump that is designed specifically for systems. They don't exist. The MCP 300, 600 and the new DD pump are all modified pumps made for other purposes.

Lorf, these last two posts give me a bit of a giggle :)

That pump that Cathar is showing is a Laing D4, and is the same type as the one DD is selling / gonna sell, albiet the DD one is going to have 1/2" inlet/outlets (the one Cathar's pics are showing have a 3/4" inlet & outlet).

Danger Den thinking of everything? phht simple rebadge and no mods to the pumps AFAIK. :)