12-blade 64mm Freewing fans - RC Groups
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Mar 20, 2015, 07:12 AM
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12-blade 64mm Freewing fans


These fans have the exact same outer dimensions as the 5-blade Freewing fans, and in fact they will fit without modifications pretty much all the 64mm airframes. The intake lip is provided, you can use it for testing, and it is needed in many models, too.

The shroud with 7 vanes is very tough, the rotor is pretty much statically balanced (you need to dynamically balance, of course), and there is a 3mm collet adapter to fit your typical motors with standoff. Perfect!

For comparison, the 12-blade Change Sun fans are not only more expensive, and they do not have 3mm adapters, they are also oversize and you need to hog out foam to fit them in your typical 64mm airframe.

Only the amp and voltage data given for these two combos offered by Freewing (using the 3500kV motor they also use in the "upgrade" 4s version of their Stingers, A-10 etc.), and a 3300kV motor which I have not seen anywhere else)

Fan units and fan combos are available, e.g., at RC Castle, and Motion RC.

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
Last edited by mopetista; Feb 06, 2016 at 02:25 AM.
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Mar 21, 2015, 06:04 PM
Registered User
...


were they dynamically balanced from factory ...

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


.
Last edited by flylow2011; Mar 21, 2015 at 07:21 PM.
Mar 21, 2015, 08:28 PM
C.E.R.N. field tester
supercollider's Avatar
There's quite a few 64mm airframes to boot.
Latest blog entry: Habu V1 Wemotec EVO
Mar 21, 2015, 10:11 PM
FireHawx
FireHawx's Avatar
They seem to have a lower blade pitch than CS fans, which would explain the lower watt/amp numbers.
Mar 24, 2015, 12:57 PM
Registered User

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...
Last edited by mopetista; Mar 24, 2015 at 03:39 PM.
Mar 24, 2015, 01:32 PM
AKA Terry Till
ex-racr's Avatar
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
Mar 25, 2015, 04:04 PM
Registered User

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...
Last edited by mopetista; Mar 25, 2015 at 04:16 PM.
Mar 28, 2015, 02:37 AM
Registered User

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...
Apr 09, 2015, 01:05 PM
Registered User

direct replacement for Freewing (and other) units


quick update: received the fan units I had ordered from RC Castle (thx for excellent service as usual, Raymond). Don't have the time now to set up and balance a fan right away, but I can say that:

these fans are a direct drop-in for the Freewing 5-blade units.

GREAT, that's what many have been waiting for, shroud dimensions seem identical

that makes them pretty universal as a replacement for 5-blade units in all 64mm planes, with or without lip, and the price is really good, too

we'll see about the load later, I will first try a 3250kV motor (Turnigy 2815, nominal 3500kV), I suspect that could be a good low amp 3s setup (some 35A or so)
Apr 11, 2015, 12:27 AM
Registered User
Quote:
Originally Posted by mopetista
quick update: received the fan units I had ordered from RC Castle (thx for excellent service as usual, Raymond). Don't have the time now to set up and balance a fan right away, but I can say that:

these fans are a direct drop-in for the Freewing 5-blade units.

GREAT, that's what many have been waiting for, shroud dimensions seem identical

that makes them pretty universal as a replacement for 5-blade units in all 64mm planes, with or without lip, and the price is really good, too

we'll see about the load later, I will first try a 3250kV motor (Turnigy 2815, nominal 3500kV), I suspect that could be a good low amp 3s setup (some 35A or so)

what is the motor housing size? how big?
can it fit an inrunner with 28mm diameter ?


thx.

.
Apr 11, 2015, 12:33 AM
Registered User

motor housing


this fan is just like your typical 5-blade 64mm, except a 12-blade rotor, and a seven-vane stator (AND way more sturdy housing)

so it's made for 3mm motors with standoff, max diameter in the motor mount 24mm

you get a 3mm adapter, and should use the motors used in the typical 64mm fans, e.g., the Turnigy 2610 and 2615 series, or any other with 22-24mm standoff diameter, and 3mm shaft

or buy one of the combos with motor mounted (and balanced, supposedly)
Apr 12, 2015, 01:55 PM
Registered User
...


btw, donrc has some CS 12 blade 64mm fans that could be used with
inrunner 28mm motors ... that is cool ...

sorry about OT :-) just can't help it

looking forward to your test result :-)



.


.
Apr 12, 2015, 02:46 PM
Registered User

32A on 3s and 3235kV; strong points of the fan


just finished setting up the first of my fans, using the 2815 Turnigy 3500kV motor, which I measured to have 3235kV (incidentally, all motors of that type have pretty much that measured kV, whereas the 3400kV 2615 are always around 3500kV...)

amp draw on 3s is around 32A for a rather full lipo, just a bit lower than expected, but good for one type of light setup (using 1600mA 3s lipos, which I like for the Freewing F-86 and Panther, and most probably the MiG-15, too)

so it can be said it's subtantially lower load than the Change Sun unit, it was something between 35 and 40 using the same type of motor, if I remember correctly.

that should give you some starting point to figure what kV motor to take for your purposes (number of cells, desired amp draw)

Really like the collet adapter, that the 4 screws for mounting the motor are provided, the fit of the spinner which was not difficult to nudge so it would be running true, but best of all, that it is really a drop-in, with the same size as the standard stock 64mm fans, which the Change Sun is NOT, unfortunately
Also, with the Change Sun, you can either buy the housing with the 24mm motor shroud (like this Freewing), but you are supplied with 3.2mm and 4mm shaft adapters, which cannot be used because the motors with standoff have 3mm shafts. OR you get the RC blog variant of the Change Sun fan, with an ugly step between the small spinner and the big motor shroud, allowing to use big motors for big power

For high power with this Freewing fan, this might be a good choice, it's a 97g motor but with standoff and 3mm shaft....

http://www.hobbyking.com/hobbyking/s..._for_64mm.html

blade pitch is lower than on the Change Sun, whether that really translates in higher efficiency I don't know

sound should be good, in my particular setup I couldn't get the motor whine to disappear, balancing is still not good enough I guess
Apr 16, 2015, 01:11 PM
Registered User

34A on 3s and 3500kV


put together another setup, slightly ligthter, but also less efficient:

the 2615 Turnigy motor with nomial 3400kV (measured 3500kV) got a lot warmer in my test / balancing runs than the bigger and heavier 2815 motor which was not far behind at 32A but stayed cool (also due to the air vents which the 2615 does not have). Another light setup for small planes

if I wanted 500W or more, I'd buy the 3300kV combo and run 4s, the motor looks massive enough

PS: One thing to notice - one of my three fan units had a 3.2mm AND a 3mm adapter, the others only a 3mm
cheers
Clemens
Apr 16, 2015, 02:34 PM
AKA Terry Till
ex-racr's Avatar
Quote:
Originally Posted by mopetista

blade pitch is lower than on the Change Sun, whether that really translates in higher efficiency I don't know
-For the most part, it does; from Stu Maxwell:
"with a specific inlet and exhaust diameter in mind, and then the blade loading is designed to be either conservative (ie it will operate efficiently over a wide range of conditions) or aggressive (ie it will be very efficient at its design point but less efficient than a conservative design when operating off design point). It's a bit like comparing an engine with a peaky power band with one with a very broad power band with lower peak power. In fan design we choose to run the blade at a low lift coefficient (conservative, results in more blade area but more drag)".
From his post:
https://www.rcgroups.com/forums/show...postcount=1126


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