The fan pictured below is from Cox/Estes (phone: 1.800.451.0339). The unit without the motor weighs 0.32 oz (9.1g). The total weight with the motor is 1.1 oz (31.8g). The inner diameter of the duct is 1.875 in (4.76cm).
Cox/Estes prototype small ducted fan.
Cox sent me the images below of the fan inside a foam nacelle that they sell with the unit. The fan and foam nacelle together weigh 1.47 oz (41.6g).
Cox fan with foam nacelle.
Here are Cox's performance characteristics with the nacelle and characteristics from my testing without the nacelle:
| Cox data with nacelle | My data without nacelle | |||
|---|---|---|---|---|
| V | I (A) | T g (oz) | I (A) | T g (oz) |
| 1.0 | 0.41 | 2.1 (0.07) | ||
| 2.0 | 0.86 | 7.7 (0.27) | ||
| 3.0 | 1.44 | 21.3 (0.75) | 1.44 | 15.4 (0.54) |
| 3.6 | 1.81 | 27.5 (0.97) | ||
| 4.0 | 2.09 | 33.5 (1.18) | 2.09 | 25.1 (0.89) |
| 4.8 | 2.53 | 42.9 (1.51) | ||
| 5.0 | 2.70 | 46.6 (1.64) | 2.80 | 36.0 (1.27) |
| 6.0 | 3.49 | 61.1 (2.16) | 3.45 | 45.5 (1.60) |
T = thrust in grams (ounces)
Here is a fan from Knight & Pridham. This is another of the smaller electric ducted fans (EDF) currently on the market. The total weight of the unit with the motor is 1.2 oz (35.1g). The inner diameter of the duct is 1.73 in (4.4cm).
Knight & Pridham ducted fan.
Blue Flame Blaster
Below is a picture of Hi-Line's Blue Flame Blaster EDF. The unit
comes assembled with the motor permanently fitted to the fan. (Maybe
not permanent, but there wouldn't be much left of the fan if you
decided to take the motor out of it.) The unit weighs 2.7 oz (76.4g),
and the inner diameter of the duct is 2.5 in (6.35cm).
Hi-Line's Blue Flame Blaster.
Here are some of the Blue Flame Blaster's characteristics from my experimenting:
| V | I (A) | T g (oz) |
| 2.0 | 1.6 | 13.3 (0.47) |
| 3.0 | 2.5 | 27.1 (0.96) |
| 4.0 | 3.5 | 42.9 (1.51) |
| 5.0 | 4.6 | 61.2 (2.16) |
I = current in Amps
T = thrust in grams (ounces)
EDF-40
GWS has a few different ducted fan units. The smallest in the line (the
EDF-40) weighs 0.95 oz (27.0g). The GWS web site lists an EDF-30 as TBA
which I am guessing will be smaller.
GWS's EDF-40.
Here are some of the EDF-40's characteristics from the GWS website:
| V | I (A) | T g (oz) |
| 6.0 | 3.1 | 53 (1.87) |
| 7.2 | 3.9 | 71 (2.50) |
| 8.4 | 4.9 | 87 (3.05) |
I = current in Amps
T = thrust in grams (ounces)
|