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Old Jan 15, 2008, 04:47 PM
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ajreynolds's Avatar
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Question
Outrunner for EDF

For the most part, people seem to use inrunners for EDF. I have seen some outrunners appropriate for using in EDF applications though. Is there any benefit of one over the other? Are the considerations (kv, amp draw, watts, etc) the same for both? Are there mounts available for outrunners that would hang the motor out in the airflow instead of burying it inside the center of the fan?

Thanks,

Andy
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Old Jan 15, 2008, 05:15 PM
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Andy... you want to KEEP this out of the air flow... at least as much as possible. Inrunners seem to be the easiest on EDF's since they offer higher KV. On EDF's KV is very important along with max amps. On a prop you can easily change props if you pull to many or to little amps to improve thrust. On a EDF its a larger and more expensive process of changing fans or motors and ESC or all of them to improve performance.

Most use inrunners cause you have a larger selection of motors that will work in the fan your using... thus allowing great control over performance.

Key things to remember:

1) what size lipo are you running (IE 3s or 4s)
2) Maximizing your motor KV and amps to match your lipo
3) using a good fan housing and rotor (some suck and will pull amps and produce little thrust.... other produce mad thrust and pull less amps)
4) get a ESC that will support 10 more amps then you motor... since you will more then likely run WOT the entire flight...speeds addictive.
5) ensure your lipo has a C rating larger then you need...so your volts stay higher or your RPMS will drop and the thrust will disappear.
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Old Jan 15, 2008, 05:45 PM
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First, outrunner can and are used. Little Screamers and Dons RC wicked series are used in smaller fans. Byrojet fans are being powered by large Hacker outrunners.

It's the matching the motor to the fan that's important. Not if it's an inrunner or an outrunner.

John
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Old Jan 15, 2008, 06:12 PM
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Let's put it this way: Most applications are better served with an inrunner and a few applications such as smaller 60-65mm fans have specialty outrunners, like the JetScreamer, purpose designed.

In a nutshell the outrunner (because of the high pole count) is harder for most ESC's to deal with at the higher RPM's than a typical inrunner with 2 to 6 poles. The other factor is in MOST cases an inrunner has a small bit better % efficiency, which in EDF can mean quite a lot.

For the very specific case of the Byron/Hacker the original fan was an approximately 19,500RPM gas design and this RPM adapts well to an outrunner.

A lot of the high performance 69mm EDF's are in the 45-50,000RPM+ range, 90mm's in the upper 30's to mid 40'000RPM and 120mm's anywhere from 25-35,000RPM.
Inrunners just deal with those RPM's more easily.
-Mike
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Last edited by Speed is Life; Jan 15, 2008 at 06:20 PM.
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Old Jan 15, 2008, 09:12 PM
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Thanks for the responses everybody. I'm learning more every day.

Andy
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Old Jan 15, 2008, 10:53 PM
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But rest assured, we are working very hard on it for larger EDF's as well I will have an outrunner in a WM400 70mm fan in an HET F-104 that should get close to 160 mph at AEF in the next weekend.
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Old Jan 15, 2008, 11:14 PM
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Quote:
Originally Posted by rvincent
I will have an outrunner in a WM400 70mm fan in an HET F-104 that should get close to 160 mph at AEF in the next weekend.
details?
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Old Jan 15, 2008, 11:23 PM
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Here's a couple pic's of the motor next to our Jet Screamer and also one mounted in the WM400 fan. The WM400 fan is unique because the motor is in front and the rotor is in the rear. We have made a new adapter for it to fit in all the fans we have been able to find. We concentratedon the 6904 and WM400as they seem to be the ones most like to use.


This is not a sales pitch,but just a reply to the thread starter's question. We have a thread going about it already.
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Old Jan 15, 2008, 11:29 PM
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And yes it will run 90mm fans easily as well. It has been tested to 1400 watts with very little heat. I ran the 6904 fan on 57 amps on 6S at 54,000 rpm's
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Old Jan 15, 2008, 11:29 PM
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I have a 6904 I am trying to come up with a good power system for, that I am going to put in my Twister.

The new motor looks great and I know you guys will have a grat product when the R and D is complete.
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Old Jan 16, 2008, 12:10 AM
hole digger
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Quote:
Originally Posted by rvincent
Here's a couple pic's of the motor next to our Jet Screamer and also one mounted in the WM400 fan. The WM400 fan is unique because the motor is in front and the rotor is in the rear. We have made a new adapter for it to fit in all the fans we have been able to find. We concentratedon the 6904 and WM400as they seem to be the ones most like to use.


This is not a sales pitch,but just a reply to the thread starter's question. We have a thread going about it already.


That's just a pretty sight.
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Old Jan 16, 2008, 12:24 AM
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The isolator ring on the adapter is a plus.
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Old Jan 16, 2008, 01:18 AM
I need a bigger garage...
ajreynolds's Avatar
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A bit off topic, but it's my thread, so I'll ask anyway...

RVincent, I know I've read that you had all of the different Haoye fans from Sonic Electric. I'm figuring out what I'm going to put in a GWS A-4 with a Haoye 3" fan (my first EDF, thus all the questions I've been asking). What motors have you found that will drive this well, on either 3S or 4S? I don't need blazing speed, just something to learn with and more than the stock GWS system can provide.

That's a really nice looking motor and mount you posted, but if it follows along with the current JetScream motor, it's going to be too expensive for my wallet.

Thanks,

Andy
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Old Jan 16, 2008, 01:52 AM
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Corona, CA
Joined Feb 2006
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i'm not bob but i did sleep at a holiday inn last night...for that 3" haoye fan, you're probably looking at a motor in the 2200-2700kv range...for 3 cells, look at the het 2w23 and arc 28-47-1.5...for 4 cells, look at the het 2w25 and ammo 28-56-2300...the prices on a few ammo 28s and 36s look pretty sweet right now at towerhobbies...
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Old Jan 16, 2008, 05:11 AM
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...here is another one:
http://www.airpowernet.com/twe/produ...roducts_id=525
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