If you're looking for high performance and that realistic jet sound in your latest 70mm sized EDF model, then look no further than this high quality 12 bladed unit.
The 12 blade fan moves a greater volume of air to make for a quiet unit with an amazing sound, this is the closest you will ever get to the sound of a turbine without actually buying one!
Molded from 30% FRP with integral mounting lugs, the unit is for use with 28mm EDF motors or those with a 28mm extension and has adapters to suit 3.17 and 4mm motor shafts.
For the best results from this and any ducted fan unit we strongly recommend checking the balance of the complete assembly and eliminating any sources of vibration.
Outside diameter: 72mm (85mm with intake lip)
Shroud length: 63mm
Rotor diameter: 68mm
Material: Carbon fiber reinforced Nylon rotor
Motor dia: 28mm max
Shaft adaptor to motor: 4mm or 3.17mm
Recommended motors: 3400Kv motor for 4s/2200Kv motor for 6s
Max RPM: 52000 RPM
Max power: 1800W
70mm 12-Blade EDF Unit
Spinner w/retaining screw
4.00 & 3.17mm shaft adapters
Retaining nut & washer
Always use a Watt meter to ensure that your motor and ESC are running within specs, as 10/12 blade fans draw more current than conventional ones.
I will use this EDF unit for the F22 Raptor purchased from HobbyKing years ago. (WS 693mm, L 1000mm, AUW 1100gr)
I used ESC ZTW Gecko 85A (same as AEROSTAR Advance by HK), LIPO ZIPPY Compact 4S 3300mAh 40C and PROPDRIVE V2 2836 3000KV 55A 4S 755W Brushless Outrunner Motor. All but ESC was purchased by HobbyKing.
I can say about the unit that the good quality looks and on the hand pressure is compact enough. The adapter for the 3 and 3,15mm motor is included. For a slightly larger engine, one of the adapters should be drilled to 4mm, which should not be a problem for a normal user. The front air nozzle can be removed. The only error is the missing retractable M3 screw length of 20mm, which I had to purchase at the local store.
The test itself in the aircraft showed the following results with a full 4S 40C battery: - 84A, 14.7V, 1235W and approximately 950 gr of thrust for 20 seconds (well beyond motor capabilities, the engine temperature has grown to 60°C) I immediately followed the test for a period of 45 seconds:
- 72A, 14.0V, 1010W and approximately costants 850gr, the engine had 70°C
Depending on the energy input 1235W and 1010W, I expected a much larger thrust. Obviously, the EDF unit needs a stronger motor with approximately 3400KV, which is also written in specs for it. Although similar EDF 12 Blade units have motors from 2600K to 3000KV of power around 1000W.
For now, I will do some experimental flights and then decide whether to use a larger engine. Concerning the sound, it would have been difficult to give some conclusions because the outrunner was quite loud and on the test itself did not hear the characteristic jet sound we all expect.
The final score would be 8/10 due to some scratches on the housing, too little thrust and the missing M3 screw.Put at Turnigy 2226 (https://hobbyking.com/en_us/turnigy-2226-3000-70mm-edf-outrunner.html) in it and it pulls 50a on a 4s battery, making about 750g of thrust. If you buy this EDF you should get a bigger motor than I did.This is a ChangeSun unit of very nice quality and reasonably well balanced. Don't fit the spinner and the shim as this throws balance off immensely. Just fit the nut with locktite. I use this EDF in my Durafly Vampire as I want to run this on 3S instead of 4S as I have loads 3S2200 lipos (I use 2 parallel). It runs on the original 2800kv motor, similar -if a little less powerfull- to the one listed in related products. On 3S this gives about 900gr thrust on a great sound and a decent flying time. This is sufficient to take off from a grass runway even if not mowed recently. The big difference to the 5- and 6 blade units is the lack of the irritating high-pitch noise. The fan itself is a little bigger so it won't fit in the original 70mm tube or the CS 10 blade tube for that matter.
Great sound gives me goosebumps every time I fly it, recommended!