Hi there, thanks for the input, some things you may wish to consider when looking at my model from others.
Take a look at a standard Jet drive intake example below…
If you calculate the intake surface area, the impeller size and volume of this unit and rotate that surface area from one face as you see here to a 360 degree surface. You will find I have the same water intake surface as a standard unit.
Looks are very deceptive until you do the number.
If anything I could increases the water intake spacing to let even more water in if I needed too.
Yes there is two 70mm impellers, the one in black is not an impeller, it is the bearing housing and ducting support with some aerofoils to uniform the water.
Ideally, two counter rotating impellers would be the best setup ever if the mechanics can be worked out over time.