HW 620-E
Mini Fan 480HW 620 replaces the RK 720-E. It is similar in size and performance to the Midi Fan. You can choose the same motors, but you will gain a higher efflux velocity at slightly lower static thrust. 
In the past many customers did not like the complicated construction of the RK 709/720. Wie have listened to that and deliver both the HW 609 as well as the HW 620 nearly completely pre assembled. All that is left is for you to mount the motor and fit the fan unit in your individual model.

Especially for this EDF we are developing an F-16 right now, that comes completely moulded and takes advantage of the efficiency of this unit. Typically you choose in such a model an HP 290-20-7 and14 cells, or an Ultra 930-6 running on 16 cells. As we have reduced the torque consumption dramatically, you can even start with simple 600 size ferrite motors.
 
Specifiactions:
Rotor:  85 mm, 6-bladed
Stator: 5-bladed
Weight: about 80 g (internal parts + shroud)
Outer diameter of inner tube: 86 mm Ø
Inner diameter of ducting: 40 mm Ø
Ageo: 45,5 cm²
Aeff: 43,0 cm²
Static thrust: about 5-20 N

Kit comprises:
rotor, inner tube with stators, adaptor (3,17, 4,00 or 5,00 mm), outer tube, streamlined cone, CNC machined formers, spinner, intake lip, nozzle, tiny bits
 

Measuring Results
Cells Motor V A W U/min N m/s Etages  
10 MG 27-T 10,7 22,1  240    7,2 36,3  0,54  
10 HP 290-20-6 10,2 33,0 340   8,6 40,0 0,51  
14 HP 290-20-7 14,8 39,3  589   12,7 48,2 0,52  
14 Ultra 930-6 14,5 27,2 399   10,0 42,8 0,54  
16 16,8 31,9 541   12,6 48,1 0,56  
18 18,2 36,0 664   14,5 51,5 0,56  
20 Ultra 930-7 21,2 31,3 672   14,9 52,2 0,58  
20 HP 220/20 A4P4S 14,2 41,9 604   13,1 49,0 0,53 Motor = 180 g
24 HP 220/30 A4P4S 25,2 34,0 876   17,1 56,0 0,55 Motor = 240 g
20 HP 220/30 A3P4S 20,7 45,5 952   18,3 57,9 0,56  
 
Battery pack used: Sanyo N-SCRC cells or similar, if battery is used

Items:
HW 620-3 HW 620, 3,17 mm adaptor
169.00 DM
(145.69 DM)
   
HW 620-4 HW 620, 4,00 mm adaptor
169.00 DM
(145.69 DM)
   
HW 620-5 HW 620, 5,00 mm adaptor
169.00 DM
(145.69 DM)
   
HW 620-L HW 620 rotor
52.00 DM
(44.83 DM)
   
HW 609-SK HW 609 streamlined cone, also for HW 620 and Midi Fan
12.00 DM
(10.34 DM)
   
HW 620-ST HW 620 inner tube with stators
45.00 DM
(38.79 DM)
   
HW 620-R1 HW 620 tube di= 86 mm, 15,0 cm length
12.00 DM
(10.34 DM)
   
HW 620-R2 HW 620 tube di= 86 mm, 20,5 cm length
20.00 DM
(17.24 DM)
   
HW 620-R4 HW 620 tube di= 86 mm, 40,0 cm length
28.00 DM
(24.14 DM)