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Old Aug 09, 2006, 07:34 PM
L33
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EDF55 with which brushless motor?

I am working on an A380 Slope Soarer and plan to convert it to EDF. The engine nacells fit the EDF55. I want to equip it with brushless motors but do not know which. I read one posting that said the GWS brushless inrunner runs to hot. Any suggestions? This thing is big so I need plenty of thrust. Span is 71 inches.

Thanks,

Bill
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Old Aug 10, 2006, 02:20 AM
Houng-wen Lin
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Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
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2028 3500KV should be a great combination with EDF55 run at 4 cells Li-Po.

2028 4500KV for 3 cells or 12V 10 cells Ni-MH.
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Old Aug 10, 2006, 07:01 AM
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so is that the 2028-4? or is that 4 reffering to the turns? I can find the motors but no specs or anything on them.
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Old Aug 11, 2006, 12:12 AM
L33
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Joined Feb 2005
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Thrust and current measurements?

Quote:
Originally Posted by GWS4CEO
2028 3500KV should be a great combination with EDF55 run at 4 cells Li-Po.

2028 4500KV for 3 cells or 12V 10 cells Ni-MH.
Mr. Lin,

Thank you for your reply. Has GWS performed thrust and current measurements with those motors? I think that 16 cells for four motors will be to heavy. I want to try to stay down to 3 cells per motor if possible.

Bill
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Old Aug 11, 2006, 12:45 AM
Seeing the Farside.
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Seattle WA, USA
Joined Aug 2005
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You know you can run any amount of motors off of one battery... as long as the battery can supply that many amps.

Personally, I'd start by giving us an expected AUW to work with.

As a standard, I'd probably try Himax 2015-3600's in the new gen EDF-55's. By my bench tests, it only draws 10.5A WOT... and is said to have 6-8oz of thrust each max.

I would have measured the thrust myself, but I don't have a proper thrust stand.

-Chris
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Old Aug 11, 2006, 01:20 AM
Pickin' an a Flyin'
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United States, TN, Knoxville
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From BPHobbies:
Feigao 1308434S at 6.63-1 ratio, 2753 Rpm/V, 0.2293 Ohms

At 11.1V in EDF 55 running EP-2245x6 rotor gets 7.4oz thrust at 5.3A.

$16
http://www.bphobbies.com/view.asp?id...49&pid=U969152

If you have a lighter plane you would like to put this in try the 1308441S, also $16. 6.2oz at 4.3A, with 11.1V.
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Old Aug 11, 2006, 02:38 AM
Houng-wen Lin
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Shijr, Taiwan. DungGwan, China. City of Industry, California.
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Looks like the thrust not too much more than GWS STD motor?

Motor torque need more up grade. Better use 2028, which motor outter dimension with 45mm length.
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Old Aug 11, 2006, 05:53 PM
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Salt Lake City Utah
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Could you please varify the current that the new GWS 4600kv (blue) inrunner will draw on a 3 cell lipo.

Cheers --- Stacker
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Old Aug 11, 2006, 07:34 PM
Pickin' an a Flyin'
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I know, but I like the low current draw and the fact that it will last more than a handfull of flights before burning up I hear the stock brushed motors are kinda random in how long they last. Some people have had many, many, many flights and some have had ONE. I figure, for $6 more why not go brushless?

On his 71" A380, we're looking at 29.6oz thrust on a fresh pack at 21.2A, which should be way more than enough for fun flight. The cheapness of the motor and esc make it that much more attractive, and the low current means he can use smaller (read: cheaper) batteries to power it. Unfortunately, only the 41 is in stock now. More efficient, but less total thrust.

Where are the thrust data tables for the 2028 in an EDF55?
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Old Aug 11, 2006, 07:42 PM
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I don't have the definitive answer, but I have the GenII fans and a pair of Himax 2025-4200 motors/cc25 controllers I'm going to use. I might just run them on 2s though because AUW is only around 13oz
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Old Aug 12, 2006, 12:36 AM
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Taipei, Taiwan
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Quote:
Originally Posted by Wufnu
I know, but I like the low current draw and the fact that it will last more than a handfull of flights before burning up I hear the stock brushed motors are kinda random in how long they last. Some people have had many, many, many flights and some have had ONE. I figure, for $6 more why not go brushless?

On his 71" A380, we're looking at 29.6oz thrust on a fresh pack at 21.2A, which should be way more than enough for fun flight. The cheapness of the motor and esc make it that much more attractive, and the low current means he can use smaller (read: cheaper) batteries to power it. Unfortunately, only the 41 is in stock now. More efficient, but less total thrust.

Where are the thrust data tables for the 2028 in an EDF55?
Here are some threads which I found out earlier, take a look at post #14 http://www.rcgroups.com/forums/showthread.php?t=539616

Chen
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Old Aug 12, 2006, 01:23 AM
Pickin' an a Flyin'
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United States, TN, Knoxville
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I also found this thread just a few minutes ago:
http://www.rcgroups.com/forums/showthread.php?t=457151

Thank you for looking those up
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Old Aug 12, 2006, 03:26 AM
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Melbourne, Australia
Joined Oct 2004
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Stacker,

I am running a blue motor in a gen 2 edf55 with a heat sink from Air craft world.
On a tower-pro speed controller on 3s I can push the motor towards 25 amps.
However it severly glitches the radio equipment.
An align 25 amp speed controller from my trex draws around 20 amps.
i can measure these exactly for you if interested

cheers

anth
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Old Aug 12, 2006, 03:40 AM
Registered User
Taipei, Taiwan
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Hi anth,

I've been informed by R&D manager that applying a GWS RD8 dual conversion receiver could eliminate lots of glitches owing to high current drawings.
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Old Aug 12, 2006, 09:01 AM
Registered User
Melbourne, Australia
Joined Oct 2004
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G'day Chen,

I have tried both of my dual conversion receivers with no improvement.
I assumed it was as a result of using a lower quality speed controller.
However that said, when testing the speed controller on another motor at much lower power settings it did not glitch. Thus I assumed it was a combination of the high power setting on a cheap speed controller for this specific motor. As the airframe I constructed is powered quite nicely at 20 amps, I have decided to avoid using the tower pro controller on this motor and sticking with an align, or hyperion controller. i can provide more detailed performance specs for the motor in the edf 55 with the blue motor for a hyperion 1500mah and an alight 2100mah 3s packs from a power draw perspective. But as the motor is ducted in an airframe, I may struggle to accurately measure rpm anymore. Thrust should be okay though, through the nose on scale method.

Cheers

anth
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