Finally did some testing today!
Long story short.. I need a bigger tank!
As shown in the pictures below, I tested both 4, 3 and 2 blade versions of my prop. At this point its obvious that 2blade is the much more efficient design.
But as I went over 2,5 kg of force (5,5lbs or 88oz) the prop started sucking air and the readings became very unstable. I lowered the thruster as far down in to the tank as I could, but that didn't help much. Also I think having the thruster only a few millimeters of the bottom of the tank will affect the performance in a negative way.
Strangely I was not able to recreate the numbers I posted earlier in the thruster thread from my previous test that showed approx 4kgs @ 22 amps. However time, the thruster started sucking air down in to the propeller witch it didn't the last time. Therefore I will move over to a bigger tang next time around.
Also I will make a few different 2blade props with different pitch and blade shapes for my next test.
Once I am able to get stable numbers I will post all the data and files.
But for now, this is what I got:
All numbers are when water passes from the propeller side and over the motor. Hence the optimal direction for the Rice nozzle design.
In the reverse direction I needed about one more amp to get the same force.
All @ 12V
4 Blade:
1A = 0,3kg
5A = 1kg
8A = 1,3kg
10A = 1,5kg
13A = 1,8kg
18A = 2,2kg
3 Blade:
1A = 0,45
5A = 1,35kg
8A = 1,8kg
10A = 2kg
13A = 2,3kg
18A = 3kg
2 Blade:
1A = 0,5kg
5A = 1,6kg
8A = 2kg
10A = 2,25kg
13A = 2,6kg
18A = 3,5kg
I can't wait to see how this turns out. I hope to be turning out some parts like this in the near future. 
