AP700 70mm EDF

This fan is made by airpower? and most cheap 70mmEDF foam jet came along with this knock-off fan. Difficult to find some detail test of this fan. I got 3 of them and all of them perform poorly in terms of thrust and speed. My recorded thrust (no intake lip)

3600kv BL test: @3s/ 11V, 19A (Power 200W) thrust 340g
@4s/ 14.4V, 22A (power 316W), thrust

4100kv motor test: @3s/ 11.7V, 80A (Power 936W), thrust 910g, 0.97g/W !!! So disappointing, low efficiency at high power use. No efflux speed test.

Another the world model 70mm EDF test reslt:
@3s/ 11V, 22A, thrust 440g; ~1.8g/ W