Midi Fan evo ducted fan unit / HET 650-68-2000, completely assembled, precision balanced and harmonically tuned

Item number: MDE 650-68-2000

89 mm ducted fan unit (11-blades)
5-6s Lipo cells
2,8.-3,7 kp of thrust
completely mounted, checked, completely balanced and harmonically tuned

Category: with HET 650-68 motors

209,90 €

including 19% VAT. , plus shipping

Recommended retail price: 209,90 €
Available now!

Delivery status: when light is red, approx. 8-10 days from time of order

Shipping time: 2 - 3 workdays

Modern high efficiency multi bladed fan unit.

The fan unit comes completely mounted with a HET 650-68-2000 motor.
The unit is assembled and checked at factory, precision balanced and harmonically tuned.



18,5 V
22,2 V
78,0 A
108,0 A
1443 W
2398 W
2,81 kp
3,68 kp
 efflux velocity
67,5 m/s
72,22 m/s
> 100 A / LV
> 120 A / LV
4.000-5.200 mAh
5.400-7.200 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.

Set comprises:
1 x Midi Fan pro ducted fan unit
1 x HET 650-68-2000

 inner diameter:  89,0 mm
 outer diameter:  92,0 mm
 length of shroud:  60 mm, w/o intake lip
 weight, complete:  402 grams (opt. intake ring + 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

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.

Shipping weight: 0,40 Kg
Product weight: 0,30 Kg

Average product review

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Total entries: 3
5 from 5 Superb!!

nice motor and fan combo!!

., 15.05.2015
5 from 5 First class service

I ordered two of these balanced units for a large SR71. Rather than just send me the first two units off the shelf, Wemotec checked the outputs of the units and did not consider them to be close enough in performance. So - and I quote -

When I got your message below last week, I decided to check your motors for similarity. They where 6% apart.
Since you have a model with the fans far apart, we built a batch of new fans and selected two, that are very close rpm wise.
Sounds better, gives better feeling.

Not only are the fans working exactly as hoped - you wont find better service than this anywhere else.

., 13.03.2017
5 from 5 Midi Fan evo- HET 650-68-2000

Balanced perfectly, it sounds smooth and the difference with a 12 blade is imperceptible, nice woosch!

., 24.10.2018
Total entries: 3