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: 3.17mm or 4.0mm
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
3.17 & 4.0mm 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.
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!