Technical Data Material: Nylon, ABS, Aluminium Weight: ca. 16 g Einsatzbereich: 20-300 W Rotor: 4 bladed (50 mm) glass filled Ageom.: 13,9 qcm Aeff.: 11,9 qcm Static Thrust: 0,5-4 N

This completely new fan is another design by Ulf Herder, utilizing CAD/CAM techniques. It has a 50 mm inner diameter and accepts motors up to 25 mm in diameter. The rotor is mounted on a prop adaptor which fits onto the motor shaft. Adaptors are available for 2.0, 2.3 and 3.17 mm motor shafts to fit all commonly available motors.
The fan unit was designed around the Graupner SPEED 300 motor, which gives about 200g of thrust on eight cells. The rotor is glass reinforced so it is rigid enough to efficiently use more powerful brushless motors like Hacker B20 and Razor Motors.
For the battery we recommend HEcell and KAN 2/3 cells for single-fan models and CP 1300/1700 for use with twins.  However, the best power-to-weight is achieved with E-Tec 1200mAh 2S2P Lithium Polymer packs (7.4V, 2400mAh, 18A peak) combined with a high-Kv brushless motor.
The fan unit comes without an intake lip, which therefore needs to be part of the model.

Technical Data Material: Nylon, ABS, Aluminium Weight: ca. 105 g Application: 200-1000 W Rotor: 6-bladed, glass filled rotor Ageom.: 49,4 cm2 Aeff.: 45,6 cm2 Static Thrust: 7-20 N

The standard for 90 mm ducted fans! The Wemotec Midi Fan follows the same design philosophy that made the Mini Fan 480 a world wide success. It replaces both the Eco Fan II and Eco Fan Pro The new Midi Fan provides:
- maximum static thrust
- high efficiency at all speeds

The fan can be driven by a simple 540 can motor on seven cells, or by brushless motors running on more than 20 cells. Depending on the motor used, static thrust in excess of 700 grams can be achieved at only 200 W input, but the fan can be run up to 1000 W input to deliver 20 N of thrust and more. The fan unit comes nearly ready to use. Just the rotor and motor need to be mounted.
Eco Fan II and Eco Fan-pro can easily be upgraded to the new standard by changing rotor and adaptor only.

'Offshore' a company situated in Bremen (www.e-impeller.de) offers a wide range of plans for EDF models. Most of the plans are based on a fan unit of 66 mm diameter. In the past that meant buying a Mini Fan 480, cutting off the outer ring (shroud) and carefully trimming down the stators and rotor. Now we do this job for you.
All that you have do is to build the ducting and glue in the stator.  We also offer 200 and 400mm long, pre-built tubes too. The HW 505 consumes about 10% less current compared to the standard Mini Fan 480. Thrust is reduced by about the same amount. This is usually compensated by one extra cell in the battery. The exhaust pipe may be reduced to 52 mm diameter to achieve a higher efflux velocity.
Obviously, this fan unit may be used in other designs too. It saves a considerable amount of weight compared to the Mini Fan 480 and especially with critical ducting situations it may show its advantages.

Technical Data Material: Nylon, ABS, Aluminium Weight: ca. 72 g (int. parts and shroud) Rotor: 75 mm, 6-bladed Ageom.: 32,8 qcm Aeff.: 32,2 qcm Static Thrust: ca. 5-12 N

The smallest fan in the Wemotec HW range is a cut down version of the Midi Fan. This can especially be seen at the rotor design. We have reduced torque consumption and increased rpm instead.
This makes fitting existing electric motors much easier. You can choose a 16 turn buggy motor running on 7-8 cells at the low end, or choose a motor like the powerful Hacker or Mega Brushless motor on up to 14 cells. You should choose this EDF unit if the Mini Fan 480 is not powerful enough, and if there is no suitable space available to fit a 90 mm fan unit. Of special interest is this fan unit as a tuning fan in models like Robbe Gnat or Kyosho T-33 and F-16. These models are typically driven by a Hacker B40 motor on 8 to 10 CP-1700 cells.

Technical Data Material: Nylon, ABS, Aluminium Weight: ca. 80 g (int. parts and shroud) Rotor: 85 mm, 6-bladed Ageom.: 45,5 qcm Aeff.: 43,0 qcm Static Thrust: ca. 5-20 N

This unit 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.
As in the HW 609 fan, the stator comes readily assembled in the outer tube. It is just left to you to mount the motor and fit the fan unit in your individual model.
Wemotec developed this fan especially for the Wemotec F-16, which comes completely molded and takes advantage of the efficiency of this unit. The ducting comes with the model and is optimized for the HW 620.