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Old Mar 20, 2015, 06:12 AM
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12-blade 64mm Freewing fans

seem slightly smaller than the 12-blade Change Sun fans - and if true, would be easier to fit in 64mm models.

strange is that both 3300kV and 3500kV are nominally for 4s, amp data is given for 11.1 Volts (and amps are quite high at 3s apparently, so I would not risk 4s with the 3500kV combo).

3300kV combo:
- Outside Diameter : 66.5mm
- Ducted Fan Length : 42.0mm
- Rotor DIameter : 63mm , 12 Blades
- Overall Weight : 130g ( Whole Unit )
- Motors : B2836-3300Kv Outrunner Brushless Motor
- Working Voltage: 14.8v (4S)
- Static Thrust : Around 930g At 11.1v (38A)

http://www.rc-castle.com/index.php?r...roduct_id=4829

------
and the 3500kV version:
- Motors : B2836-3500Kv Outrunner Brushless Motor
- Working Voltage: 14.8v (4S)
- Static Thrust : Around 1150g At 11.1v (55A)

http://www.rc-castle.com/index.php?r...roduct_id=4830
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Last edited by mopetista; Mar 20, 2015 at 11:03 AM.
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Old Mar 21, 2015, 05:04 PM
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...


were they dynamically balanced from factory ...

3s , 3300kv, 38 amp... seems to be a good light system
using 3s 2200 lipo


.
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Old Mar 21, 2015, 07:28 PM
C.E.R.N. field tester
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There's quite a few 64mm airframes to boot.
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Old Mar 21, 2015, 09:11 PM
FireHawx
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They seem to have a lower blade pitch than CS fans, which would explain the lower watt/amp numbers.
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Old Mar 24, 2015, 11:57 AM
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3s or 4s?

Sent an email to Raimond Fung - got a prompt answer (superb service as usual from RC Castle):
- they are supposed to work on 4s
- the 3500kV variant is for single fan planes
- the 3300kV for twins

still don't know - that would be a LOT of power on 4s, if you already get on 3s:
- for 3300kV 38A at 11.1V
- for 3500kV 55A at 11.1V

I'm hoping for the Euro-Dollar exchange rate to get more favorable (for the Euro), then I'll just try out one of those, on 3s, I like light planes, and 38A is more to my liking in the 64mm class than 55A...
edit: 130g is pretty heavy, the old-style 5-blade fans in the small 64mm models (for 1600mA lipos, around 30A) weigh just around 80g.
So, the weight penalty is only acceptable at higher power levels IMO. Still, 50A max on 3s is what I would like, or 40A max on 4s...
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Old Mar 24, 2015, 12:32 PM
AKA Terry Till
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For the equivalent watts, the 3300kV version puts out more thrust than the Cyclone Power turbofan (6 blade)+Cyclone power 4500kV out runner (800g).
They also put out more thrust than the Don's wicked 4800kV with a Freewing/Edo 5 bladed 64mm fan (also ca. 800g)
The motor/fan combo is heavier, though.
I'd love to get some, but I have all these Cyclone Power turbofan (6 blade)+ 4500kV out runners and a Don's 4800kV with a Freewing/Edo 5 bladed 64mm fan as well as a few other 64mm combos
Going to hold off for now...

Terry
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Old Mar 25, 2015, 03:04 PM
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also 4000kV version - AND fan unit w/out motor at motion!

Realized that Motion RC also sells the 3500 and 3300kV combos, and they are stock
They also list (no stock) also a 4000kV version, now that would be 3s I guess. 70A?

I hope motion will soon test them, now that they are selling them...

http://www.motionrc.com/freewing-64m...-4000kv-motor/

edit: just saw that motion even lists the EDF unit alone, for a really nice price
http://www.motionrc.com/freewing-64m...cted-fan-unit/

I hope RC Castle will also sell this unit for non - US customers...
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Last edited by mopetista; Mar 25, 2015 at 03:16 PM.
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Old Yesterday, 01:37 AM
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fan unit available internationally, and even spare rotors

here we go

fan unit (with adapter for 3mm motor shafts)
http://www.rc-castle.com/index.php?r...roduct_id=4873

rotor
http://www.rc-castle.com/index.php?r...roduct_id=4874

and RC Castle now also lists the 4000kV variant, and gives the following data
- Motors : B2836-4000Kv Outrunner Brushless Motor
- Working Voltage: 11.1v (3S)
- Static Thrust : Around 950g At 11.1v (55A)
http://www.rc-castle.com/index.php?r...roduct_id=4831

makes me wonder if the data for the 3300kV and 3500kV variants were wrongly given for 11.1V and should instead have been for 14.8V... See the data for the 3500kV, e.g.:1150g At 11.1v (55A) - more likely to be 1150g at 14.8V and 55A...
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