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EDF Ducted Fan Wemotec Midi Fan evo / HET 650-58-1970

MDE 650-58-1970-PACK

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Modern high efficiency multi bladed fan unit. The fan unit comes completely mounted with a HET 650-58-1970 motor. This Pack is precisely assembled, balanced and tested by us.

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Pack content

Data sheet

EDF thrust (categorization) 1-2kg, 2-3kg, 3-4kg
Direction of Rotation (EDF Rotor) Classic Counter Clock Wize (CCW)
EDF Diameter Class (mm): 90
Blades: 11
Turbine shroud Synthetic
EDF Rotor Synthetic
Turns/min/Volt (Kv): 1970
Motor Type: In-Runner
Motor Diameter (mm): 36
Shaft diameter (mm): 5
Battery Cells: 4s - 14.8v, 5s - 18.5v, 6s - 22.2v

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EDF Ducted Fan Wemotec Midi Fan evo / HET 650-58-1970

Modern high efficiency multi bladed fan unit. The fan unit comes completely mounted with a HET 650-58-1970 motor. 

This Pack, composed with the EDF unit, the motor and the assembling and balancing service, is precisely set, harmonically balanced and tested by us. It can be directly installed inside your model.


Characteristics / Voltage 4s 5s 6s
 Voltage 14.8 V 18.5 V 22.2 V
 Current 48.5 A 72.0 A 91.0 A
 Power 718 W 1332 W 2020 W
 rpm nc nc nc
 Thrust 1.66 kg 2.48 kg 3.20 kg
 Efflux velocity    51.90 m/s 63.41 m/s 72.02 m/s
 Efficiency 0.59 0.58 0.56
 Controller > 60A / LV > 80A / LV >110A / LV
 Battery 2500-3000 mAh 3600-4800 mAh 4500-4800 mAh

The controller should be chosen 20% over rated due to the long lasting load.
LV = low voltage controller up to 6s, HV = high voltage controller above 6s.
Battery should be chosen about 15/ - 1/20 of the max current for 4-3 minutes WOT. 30-40 C is appropriate.
Readings:  We measure with a constant voltage of 3.7 V / cell. Current and thrust are measured with a small intake lip (r=6 mm) at 21° C, 50m asl and standard pressure. Depending on battery, controller and installation you may see higher or lower figures.

Technical description

 inner diameter:  89,0 mm
 outer diameter:  92,0 mm
 length of shroud:  60 mm, w/o intake lip
 weight, complete:  395 grams (opt. intake rin + 19g)
 fan swept area:  49,40 sqcm
 rotor:  11 blades, nylon (glass reinforced)  
 rec. thrust tube dia.:   75 mm diameter
 Timing ESC:  approx. 6° (4-pole motor)
 PWM:  8-12 kHz

Set comprises

  • 1 x Midi Fan pro ducted fan unit
  • 1 x HET 650-58-1970

Motor specifications

  • Diameter : 36 mm 
  • Length : 57.5 mm
  • Shaft Dia. : 5 mm 
  • Weight : 250 grams 
  • Internal resistance: 12
  • No load current (lo): 2.3 A
  • Max efficiency: 88% 
  • Poles : 4 
  • No load KV : 1970
  • Suggested lipo cells. : 6S 
  • Max amps: 100A (6S)
  • Power Nominal: 2200 watts
  • Recommended advance timing : low

Midi Fan evo unit Specifications

Ducted Fan unit of the poular 89 mm Midi Fan class, both optimized for Sound and efficiency. This fan brings efficiency of multibladed fans to a new level. The one piece glass reinforced Nylon rotor comes calibrated and dynamically balanced. All components are compatible to the former Midi Fan pro. 

  • Material: Nylon, ABS, Aluminium
  • Weight: about 102 grams, incl. intake lip
  • Power range: 1.000-4.000 W
  • Max. rpm: 50.000 U/min
  • Rotor: 11-blades (87,5 mm) glass reinforced Nylon
  • Set: all parts, incl. instruction
  • Ageom.: 49,4 qcm 
  • Aeff.: 45,6 qcm 
  • Thrust: 7-50 N
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