EDF unit
grabcad
This edf unit is calculated for 11 kg of thrust with 143 m/s exhaust speed. Air comsumption is 0.786 kg/s at 34000 rpm. The edf is calculated for this motor http://www.hobbyking.com/hobbyking/store/__19111__Turnigy_SK3_Fandrive_3994_850kv_120mm_EDF_.html I don't know the monting holes parameters, so you'll have to make them "by place"
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