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EDF Help

#1
Hello! bought this edf/motor:

https://hobbyking.com/en_us/blade-high-performance-70mm-edf-12-blades-ducted-fan-unit.html
https://hobbyking.com/en_us/turnigy-2226-3000-70mm-edf-outrunner.html

The setup draws 50 amps on a 4s and produces about 700g of thrust with a thrust tube. It would be nice to get a little more efficiency out of the setup. I'm thinking about buying these:

https://hobbyking.com/en_us/edf-ducted-fan-unit-6blade-2-75inch-70mm.html
https://hobbyking.com/en_us/turnigy-l2855-2100-edf-outrunner-900w.html

Then I would try the 12blade on 6S with the 900W motor, and the 6blade on 4S with the 2226.

Does anyone have experience with these setups?

The 900w motor claims a diameter of 28mm, but that is the supposed diameter of the coil. Will it fit these 28mm EDF units?