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1 people online in the last 1 minutes - 0 members, 0 anon and 1 guests. (Most ever was 29 at 13:36:32 Sat Aug 3 2002)

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Honza_Basta
13:03:22 Thu
Dec 26 2013

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infinity power jet

Hi all,
are there any skills with the Infinity jet? I mean how it goes in usage, increase os suction power in comparision with classical power jet etc...
Not easy to make, not available to buy... But it seems that the suction power of this jet should be good. The worst problem I see is sand/gravel in the tiny jet.



less efficient design, I mean:


  
growler
14:39:36 Thu
Dec 26 2013

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Re: infinity power jet


Postby finegold Thu Apr 15, 2010 9:39 am

Thanks John for the kind words, except for the "old" part of the Treasure Emporium reference.

The real credit for most of the jet/eductor design foundation goes to D&B Custom Dredge.

Dick Arthurs and Bill Cohenour were the masters of tenacious "cut and try". Many hours in the test tanks and on Piru Creek (when you still could dredge there).

From their work I marched on and also created a formula for getting you close to want you want. I say close because there are many hidden variables that will drive you nuts. Ie: workmanship, alignment, etc.

I don't profess any special knowledge on single eductors as the performance, using the same gpm and pressure, is significantly different than using a dual eductor.

Anyway my experience (primarily duals and my favorite quads) is 11.5 to 12 degrees on the angle of the eductor to the jet tube. Perfect center of jet tube discharge form the eductor. Lots of tack welding and cooling to minimize "creep".

Formula (presuming the previous was boring):
The area of the jet in sq. inchs times 7% = eductor bore in sq. inches

Example: 2 inch jet [Pi x (Radius of jet - Squared) = jet in sq in.]
2 inch jet = 3.14 x (1" (radius of jet) Squared)
3.14 x (1 x 1) = 3.14 sq in for a 2" jet
3.14 sq inches x 7% (.07) = .219 sq. Inch for eductor

Now for the tricky part: convert backwards and finally come up with a bore diameter.
Eductor size is .219 sq. In which we will call .22 - because it is easier.
Divide .22 by 3.14(Pi) = .07 , now find square root of ..07 which by calculator is .264 IMPORTANT: this is the radius of the eductor size - NOT the bore size!
Multiply .264 x 2 = .528". Refer to a conversion chart to find conversion of decimal inched to "regular" inches which is fractionally larger than 1/2".

At 30 psi the 1/2' eductor will require 41 g.p.m. Without getting into an explanation of friction loss of your ten foot, one inch diameter pressure hose, you will require 33.5 psi at the pump to provide the 30 psi at the eductor.

Make dual jet with this math, easier and very strong suction, jim

  
micropedes1
02:08:50 Sat
Dec 28 2013

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Re: infinity power jet



Honza, how big do you want to run? I have built a bunch of these type eductors and have a few tricks that might prove useful. And the mating halves need to be machined at 11 degrees.

Efficiency is the reason for their use as you can optimize your pump output by adjusting the restriction of the jet venture.

  
micropedes1
02:15:50 Sat
Dec 28 2013

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Re: infinity power jet



Here is the outside part of the jet. I believe that this one was either a 2 or 3" educator. True, debris and gravel can clog the jet and reduce its effectiveness. But it is a simple matter to unscrew the hose a couple of turns to clear and then retighten it. You will need a locking ring to get it back to the original setting.

  
Honza_Basta
09:51:17 Sun
Dec 29 2013

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Re: infinity power jet

I mean, this is the best design, what I had seen. Srews, ability of the jet tunning...
I want to run 4" jet. Later I am gonna clone ma drege to may alternate 4" or 6" with 2 pumps. But 6" is quite large for infinity jet. Not impossible, but it would be heavy stuff. So for 6" would be better classical twin jet system.
Do you have any datas about suction power increase with infinity jet?

  
Honza_Basta
15:02:15 Mon
Jan 6 2014

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Re: infinity power jet

I had seen also this: http://packratdredges.com/packrat_website-1_002.htm

But in this size it should be just only like a toy for my children... :confused:
[2 edits; Last edit by Honza_Basta at 15:03:40 Mon Jan 6 2014]

  
micropedes1
15:29:53 Tue
Jan 7 2014

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Re: infinity power jet

Here ya go, Honza. This is the beast that you are looking for. All the others are just copies. No longer in production, but originally available in 2 1/2, 4, 6, and 8 inch versions. For a single engine setup, there is nothing better.


I still have a 6" and 8". You definitely do NOT want to get your fingers too close to the nozzle on the big gravel-munching monster (VW powered and a big Precision pump)

  
micropedes1
15:33:09 Tue
Jan 7 2014

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Re: infinity power jet

And an internal parts breakdown to show the internal setup.

  
chickenminer
05:07:30 Fri
Jan 10 2014

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Re: infinity power jet

Glen,
On that photo of the homemade jet. Why are both sides threaded? Couldn't one side be fixed, allowing the other side that is threaded to do adjustments ?



---
Dick Hammond - Chicken, Alaska
Chicken / Stonehouse Creek Mining
Chickenminer.com
 
 
micropedes1
20:21:09 Fri
Jan 10 2014

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Re: infinity power jet

It could easily be fixed on one side and threaded on the other, Dick. It just happened to be the way that I made that particular jet. I took a stack of 1/4 inch plate and welded a bead down either side to anchor them in place. Then anchored the stack in a turret lathe, punched the center hole and threaded the whole stack at one time. Voila! Uniform perpendicular threads all the way thru. Nothing more frustrating that to get it all welded up and find one of the threaded pipes cocked to one side (more jet on one side than the other)

Lemme look under the barn. There is a dual inlet circle jet for a dual engine 10 inch monster under there somewhere.

  
micropedes1
20:31:11 Fri
Jan 10 2014

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Re: infinity power jet

Note the input for the jet coming in from the top. If you have both sides threaded, you can move the jet opening back and forth inside the pressure chamber until you can find a "sweet spot" where there is a minimum of turbulence and get a bit more suction.

A better design has the input coming in parallel to the suction hose (and pressurized flow pointed toward the sluice). You lose about 15% of your energy when the water comes in from the top and slams into the metal jet surface. Causes cavitation. Pressure differential is not the same all the way around the jet, the pressurized cone in the center of your suction becomes slightly off-center, and the suction suffers.

  

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