Ducted Fan with Brushless Outrunner?

[FinnFlyer]

Can you use an outrunner in a ducted fan?

If so, what fan would I need for an AXI 2814/10?

I have the motor, a phoenix-45, and a kokam 3S 2000mAh 15C.

Any help is appreciated.:)

[r_kopka]

Can you use an outrunner in a ducted fan?
If so, what fan would I need for an AXI 2814/10?
I have the motor, a phoenix-45, and a kokam 3S 2000mAh 15C.
Any help is appreciated.:)

~1500 KV , 3s -> 16000u/min is a bit low for ducted fan.
Motocalc: with 6x6" 14A 150Win Thrust 385g,
6x6" 4bladed-> 22A 226W 624g
so you would need quite a big fan.

Generally outrunners are for low rpm and therfore not for impeller. Most impellers will have problems mounting an outrunner (space, movement).

RK

[jonnyjetprop]

Kress jets makes a DF that uses an AXI motor. I've never seen one though.

http://kress-jets.com/outrunner.htm

John

[FinnFlyer]

Thanks Jonnyjetprop!

That's just what I was looking for.:D

[giflyrc]

My crazy random idea is this:

Using an outrunner because it delivers high torque and a gearbox geared up instead of geared down say 6:1 then you could turn a impeller, say between 30 to 50 thousand rpm under load using a low kv high torque motor (BLU SKY #'s )

I know, I know, there ain't no free lunch and this is a wild a$$t thought

Roger aka GIFLYRC

[ForestCam]

My crazy random idea is this:

Using an outrunner because it delivers high torque and a gearbox geared up instead of geared down say 6:1 then you could turn a impeller, say between 30 to 50 thousand rpm under load using a low kv high torque motor (BLU SKY #'s )

I know, I know, there ain't no free lunch and this is a wild a$$t thought

Roger aka GIFLYRC

One thing's for sure, it'd definatly sound like a turbine spooling up!:D

[Solcat]

www.balsapr.com (http://www.balsapro.com) is recommending outrunners for Walkera ducted jets.

[watt_the?!]

if you want to have an outrunner in an EDF, look for the larger EDFs...vfor sure.

id start with the midifan...good luck with the kress jets ones...

Tim

[babylon5]

Hi , go to this link . This 80mm and 58mm EDF uses outrunner motor.

http://www.jethobby.com.sg/cgi-bin/ezsite/prod/manager.cgi?action=show&pid=667&cid=37&idx=1

Cheers

[babylon5]

Sorry wrong link . Here is the correct one

http://www.jethobby.com.sg/cgi-bin/ezsite/prod/manager.cgi?action=show&pid=728&cid=37&idx=1

Uses a 580W outrunner motor for the 80mmEDF.
Don't know the performance. This is very new product. They also have a 58mm EDF fitted with outrunner motor.

Cheers

[ericthetree]

you might want to check this out over on rcg

[Bmiller]

The smaller fans are starting to show up with outrunners nowadays.
My E-flite airliner uses 3500kv outrunners in the 3bladed wattagepowerfan size units to great effect.

Termite and I both have the prototype LittleScreamers JetScream outrunners in our Alfa fans for testing. I've flown mine a bunch of times and it's just been rewound for higher RPM. Hope to pick it up today!
Randy have you flown your Mig yet? or sending the motor back?
LS is also currently testing an adapter to fit these motors on the Hobby-Lobby 56mm XF fan units for the F/S ME-262. These parts and motors should become available sometime after October from H-L.

Bruce

[ericthetree]

bruce what kind of thrust #'s are you getting ie 3s , 4s

[Bmiller]

I got mine back today!:) Will post numbers asap.
Okay this is the Alfafan with 3S Impulse1450s that need some cycling.:rolleyes:

[Erik van Schaik]

http://www.airpowernet.com/twe/product_info.php?products_id=184

I just found this link for an outrunner in an Ap700. Not very interesting data at first sight, but it might be an interesting setup for a light plane with a 3s1p hyperion 2100 16C pack (130gr aproxx) such as the Tsunami (edf design contest winner rcgrpz)

Grtz, Erik

[MrElusive]

I have the same idea and i have the gears needed. this will be 1:8 8 turns on the fan for every 1 turn of the motor. this will produce the needed rpm for max thrust needed in most edf jets. I just wish i knew someone with a shop that i could count on. heh. but iam working on making a proto type now. all i need to do now is some simple machining. I will post more once i get something together mounted in one of my scratch build edf's.

My crazy random idea is this:

Using an outrunner because it delivers high torque and a gearbox geared up instead of geared down say 6:1 then you could turn a impeller, say between 30 to 50 thousand rpm under load using a low kv high torque motor (BLU SKY #'s )

I know, I know, there ain't no free lunch and this is a wild a$$t thought

Roger aka GIFLYRC

[Larry3215]

The Little Screamer jet scream motors work reasonably well in the XF fan and the Alpha fans in the Alpha Saber and Mig.

Not as efficient as an inrunner but not all that bad. The Himax 2025 5100 is a better way to go on 3S.

They have the advantage that they get a lot more cooling and you can push them way beyond thier max efficiency range and get some significant extra speed - at the expense of a lot more watts - by going to 4S.

There are balance and space issues as well but its doable.

They are not much god on larger fans.

Im running a pair in my GWS F15 on the 64mm GWS fans on 3S and they are pulling about 27 amps and giving me about 35K rpm.

I am using a pair of Hyperion 1913 06M outrunners in my GWS 262 and they only pull about 21 amps and give me 34000 rpm. On 4S Im seeing about 39K and a significant speed boost at about the same power consumption as the LS on 3S.

The Hyperions are more efficient and cheeper to boot.

The guys at CustomCdRom and MikroDan motors are both working on outrunners for the smaller fans - 70mm and smaller - that look to be very very nice performers.

They both have offerings that outperform the Little Screamer by a large margin and the CustomCdRom tripple looks very good for 64mm fans to maybe 70 mm fans. The customCdrom has the advantge that you can order a kit and wind what ever Kv works best for your application - or you can order one custom wound.

The Hyperion 1923 motor also looks promising for the GWS 64 and 75mm fans.

In general - inrunners will always be more efficient but the outrunners have a definate advantage on cooling that may offset that to a large degree. Especially if an appropiatly sized inrunner isnt available - which is true of the smaller to mid sized fans.

Larry

[babylon5]

I have the same idea and i have the gears needed. this will be 1:8 8 turns on the fan for every 1 turn of the motor. this will produce the needed rpm for max thrust needed in most edf jets. I just wish i knew someone with a shop that i could count on. heh. but iam working on making a proto type now. all i need to do now is some simple machining. I will post more once i get something together mounted in one of my scratch build edf's.

Hi Mr. Elusive, I have been toying with the larger size EDF 89-90mm .
I notice that you can get quite a hack of thrust if the fan turns anything above 24,000-27,00rpm .

I have this crazy idea that if you can get a high KV brushless motor geared down say from 1.5 :1 or 2:1 ratio , you might get enough rpm to turn those larger diameter rotor fan.

Like you am also looking for anyone with a mechanical /machine workshop to do the job. This idea might just work.
:D
Cheers

[bruff]

To date I have flown the following out runner motors in Haoye fans.
3.5" Hacker A30-10XL 8S LiPo
4" Hacker A40-12S (10 POLE) 8S LiPo (flew 7+ lb jet)
4" Hacker A40-8L (8 Pole) 6S
5" Hacker A50-14S (10 pole) 11S LiPo

Testing is going great to date.
Bob

[MrElusive]

Hi Mr. Elusive, I have been toying with the larger size EDF 89-90mm .
I notice that you can get quite a hack of thrust if the fan turns anything above 24,000-27,00rpm .

I have this crazy idea that if you can get a high KV brushless motor geared down say from 1.5 :1 or 2:1 ratio , you might get enough rpm to turn those larger diameter rotor fan.

Like you am also looking for anyone with a mechanical /machine workshop to do the job. This idea might just work.
:D
Cheers

Yeah ive been looking into the bigger edf's too but ive got alot of thrust with just the 3 " walkera edf's.