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Electric Ducted Fan Jets Discuss electric ducted fan jets here including setup tips, power systems, flying techniques, etc.

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Old 11-01-2011, 08:27 AM   #1
raido56
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Default New Change Sun 70mm 10 blade fans in Super Airliner

Hi guys, I am getting ready to redo one of my Eflite Super Airliners with the new 70mm 10 blade fans from Change Sun. I posted a few pic's of them nice fans and rotors. They come with a 3.2 & 4mm shaft adapters. Gonna glass the whole jet with 1/2oz F/G and WBPU. Putting in electric retracts, lights and a new paint job. I fly off a grass field so these fans will have the extra pull I will need in the spring and summer when the grass is a bit thicker. Gonna run the Sapac D2842 3100Kv motors, 2x 4s 3300 40C packs. From what I have read on here they will pull about 95 amps at about 1400 watts each side at WOT. So total will be about 2800 watts and about 6 1/2 to 7 pounds of thrust total. I won't need all that power in the air but it's nice to know it's there if needed. Should fly real nice at 1/2 throttle and I hear these fans sound real nice. Not that high pitched sound like many of the high power 70mm fans make but that swoosh sound like a turbine.

Keep em flying
raido56/ Herb


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Old 11-04-2011, 06:15 PM   #2
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Here's a video of the fan unit from YouTube. Sounds real good.

http://youtu.be/7ZPsvqJ8ha0



Keep em flying
raido56/ Herb
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Old 11-04-2011, 07:22 PM   #3
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Sounds like JATO assist you're going to have!

I'm in the process of rebuilding mine now, took a real beating at this year's fly in, mostly due to mother nature and not me for once.

Taking out the air retracts and installing electrics too. Can't beat the look with wheels up.

Have you looked at the nacelles for fitment of the new units?

When I die, I want to go like my Grandfather did, in his sleep...... Not screaming like the passengers in his plane.
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Old 11-05-2011, 06:41 AM   #4
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Originally Posted by Glacier Girl View Post
Sounds like JATO assist you're going to have!

I'm in the process of rebuilding mine now, took a real beating at this year's fly in, mostly due to mother nature and not me for once.

Taking out the air retracts and installing electrics too. Can't beat the look with wheels up.

Have you looked at the nacelles for fitment of the new units?
Hello, Just a bit of sanding to the inside of the nacelles and they will fit no problem.

Keep em flying
raido56/ Herb
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Old 11-05-2011, 06:43 AM   #5
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OMG !!!!!!!!!!!

I had some time today and ran up the fan in my test stand. Damm this fan put out real good power. My motor is the Sapac silver can D2842-3200Kv, Battery is a 4s 3300 40C Sky Lipo and H/W Pentium 80 amp ESC. I got 1249 watts at 89.7 amps. I could not get the RPM's as I was inside my house and the light is not right to get a good reading from the optical tac. I also did not like the looks of the stock housing mounting holes. So what I did was grind down washers to fit the mounting slots holes. In other words I squared off the washers to get more grip area around the mounting holes. Balanced the rotor (BTW it was all most perfect out of the box) and put two small flat spots on the shaft. Pop it in the test stand and went to town. Yes this fan is quiet as all he!! for a 70mm fan for sure. Below are a few pic's of my test stand as you can see it not a light weight stand. It's all metal with the wood mounted on top. I was testing it on my kitchen table and it started to move the whole stand over the table . This was with the battery even mounted on the stand so I put it on my scale. Weight was 9 1/2 pounds. So this fan was moving all that at just over 1/2 throttle and smooth as silk to boot. Not bad for a 15 buck fan .

Keep em flying
raido56/ Herb


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Old 11-05-2011, 10:47 PM   #6
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Ok, Just retested my set up with a full charge on a 4s 3300 40C Sky Lipo. The test before the pack did not have a full charge on it. I wanted to see if I will need the 100 amp ESC's. Looks like I will lol. Here's what I got on my Power Pro analyzer for the first 15 sec.



Keep em flying
raido56/ Herb


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Old 11-05-2011, 11:37 PM   #7
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Did a small video of the fan on my test stand. You can hear it get quieter as more power is put into it. As you can see in the video it's got real good power out the back end of the fan lol. I like this fan for sure gonna get a few more of them next week.

http://youtu.be/l1mdDAAGl-o


Keep em flying
raido56/ Herb
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Old 11-09-2011, 06:53 PM   #8
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Heres another video on YouTube. Wow sounds great!!!!!



Keep em flying
raido56/ Herb


http://youtu.be/elrBV1tkpQg
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Old 11-16-2011, 02:14 AM   #9
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Herb keep me posted on how they work out for you on the airliner.
Much as I like the stock fan performance, I wouldn't mind a little more speed out of it. And getting rid of the whine would be an added bonus.

Any ideas on using them on a 3S set up instead of 4S. Nearly 200 amps is a little out of my league for performance. I'd have to gang up four 3S3700's I have and I'm afraid of adding that much weight, even with the higher power.

When I die, I want to go like my Grandfather did, in his sleep...... Not screaming like the passengers in his plane.
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Old 11-16-2011, 08:02 AM   #10
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Originally Posted by Glacier Girl View Post
Herb keep me posted on how they work out for you on the airliner.
Much as I like the stock fan performance, I wouldn't mind a little more speed out of it. And getting rid of the whine would be an added bonus.

Any ideas on using them on a 3S set up instead of 4S. Nearly 200 amps is a little out of my league for performance. I'd have to gang up four 3S3700's I have and I'm afraid of adding that much weight, even with the higher power.
Hey GG, Well I got one nacelle done. It took about 1/2 hour to sand by hand and fan fits just right. Look real good with the 10 blades in it. I did a test today with a 3s 40C 2650 pack but it was not fresh off the charger. Each cell was at about 4.1 and got 690 watts at about 60 amps. Will test later today with a fresh charged pack. I think it will be about 800 watts at about 65 amps. So the S/A should have about 1400 to 1600 watts with both fans at WOT.

keep em flying
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Old 11-17-2011, 03:48 AM   #11
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Originally Posted by raido56 View Post
Hey GG, Well I got one nacelle done. It took about 1/2 hour to sand by hand and fan fits just right. Look real good with the 10 blades in it. I did a test today with a 3s 40C 2650 pack but it was not fresh off the charger. Each cell was at about 4.1 and got 690 watts at about 60 amps. Will test later today with a fresh charged pack. I think it will be about 800 watts at about 65 amps. So the S/A should have about 1400 to 1600 watts with both fans at WOT.

keep em flying
raido56/ Herb


Never saw an airliner hover.

When I die, I want to go like my Grandfather did, in his sleep...... Not screaming like the passengers in his plane.
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Old 12-01-2011, 05:49 AM   #12
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Ok, Got the C/S 10 blade fans mounted in the S/A all ready to go. Hope to get her in the air this week. Running 2-Sapac 3200 kV motors, 2-65 amp HiFi ESC's, 5 amp UBEC and 2-40C 3s 2650 Sky Lipo's. Should fly real nice with these fans. I am getting 62 amps, 665 watts per motor at WOT. So I will have about 1330 watts total to take off from my grass field. Here are a few pic's of her. Will repaint her after her maiden flight.

Keep em flying
raido56/ Herb


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Old 12-01-2011, 02:27 PM   #13
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Looks sweet Herb.
Question though, looking at the specs you posted, I'm coming up with roughly 2 minutes of flight time using 80% of the pack capacity?

When I die, I want to go like my Grandfather did, in his sleep...... Not screaming like the passengers in his plane.
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Old 12-01-2011, 06:18 PM   #14
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Hi GG, Yes at WOT I would only get about 2 1/2 min flying time. I should get about 4 to 4 1/2 min flying time. I have the same motor with a Het 4 blade fan in a T-45 pulling 65 amps from a 40C 2650 pack and get 3 1/2 min flying time. And this is flying the T-45 at WOT about 50% of the flight. The stock S/A only had about 400 watts total and flew just fine. So I will be flying WOT for the take off and then go to 1/2 throttle at about 34 amps at 385 watts per motor and still have about 2 times the power of the original power set up. I have 3 other D/F jets that use a 2650 pack all pulling about 55 to 65 amps and they all get 3 1/2 min flying time or more with the right throttle management. I don't go by calculations that much. I like to go by real flying times it works for me.

Keep em flying
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Old 12-02-2011, 01:11 AM   #15
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i like the looks of those fans.. will look good in a 747

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Old 12-05-2011, 07:26 AM   #16
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Hi all, I had her maiden flight on Sat. She took off real nice from our grass field. Full power on take off than down to half power for most of the flight. Rolls, loops even knife edge no problem. She has real good power way better than the 3 or 6 blade stock fans. Ran the motors on 2- 3s 2650 40C packs and getting 4 min on the packs. After I get the retracts in it I will be able to use some 3000 or 3300 packs and get about 4 1/4 to 5 min out of her. I have to say the sound from these fans are better than the stock fans. I don't get the woosh sound like other have gotten in a long ducted jet. I think it's because of the short nacelles and lower RPM's from the 3s packs. But it does look real neat with all them blades in the fan. Had a few flights today also. My buddy took a video of one of her flights today so as soon as I get it from him I'll post it.

Keep em flying
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Old 12-05-2011, 07:23 PM   #17
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Sounds great Herb! Would love to see the video.

I see you didn't use the lips on the fan shrouds, do you think it would make any difference?

And what motor did you run on 3S with em? The Sapac 3200's?

When I die, I want to go like my Grandfather did, in his sleep...... Not screaming like the passengers in his plane.
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Old 12-06-2011, 06:31 AM   #18
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Originally Posted by Glacier Girl View Post
Sounds great Herb! Would love to see the video.

I see you didn't use the lips on the fan shrouds, do you think it would make any difference?

And what motor did you run on 3S with em? The Sapac 3200's?
Hi GG, I did use part of the lip. I cut the lips down so just the part that went around the front of the shroud was used. I did them that way to give the front of the fans some extra strength.

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Old 12-08-2011, 07:27 AM   #19
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Hi all, My buddy shot this video of her maiden flight. This flight was on 2-3s 2650 40C packs. I like the take off from grass on the stock wheels. (NOTE) The rate she climbed at after take off I like it for sure .. Plus the winds were about 10 MPH with the stock fans I would not fly her when it was windy as she would get pushed all over the place. With these fans no problem at all. I hope to get a better video this week with my HD cam. After that I will try to get the retracts on her and new paint job sometime later.

Keep em flying
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http://youtu.be/l4b8UtZQ7Qc
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Old 12-19-2011, 11:53 PM   #20
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Herb, since I'm not in need of Mach1 speed, I was looking at these motors.
http://www.hobbypartz.com/75m96-ducted-2220-2700.html

Good for up to 5S power. Found a set up on 4S running a Wemo 6904 and was only pulling 34 amps.

Figure this might fit the bill for the CS units for me.

Thoughts?

When I die, I want to go like my Grandfather did, in his sleep...... Not screaming like the passengers in his plane.
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Old 03-02-2012, 01:21 AM   #21
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Herb thanks for the inspiration, and advice.

Here's what mine looks like as of today when I got her on her wheels finally. Of course she's got the CS fans!

And she's loaded. Electric retracts, servo operated gear doors, full NAV lamps, strobes, beacons, landing lamps, cockpit lamps, even tail emblem illumination. Glassed all of it.

Even spent the big bucks on Rustoleum rattle can paint.

Got the lips installed too. Built a set of hoops to fit between the lips and fans so it's all tied together and a straight uninterrupted shot to the rotors. And even lined the tail cones with sheeting to cut down on FOD.

Going with Turnigy 2855/2300 kv motors on 4S. Should provide plenty of go go, will be over 1:1 on thrust, nearly 1800 watts.


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When I die, I want to go like my Grandfather did, in his sleep...... Not screaming like the passengers in his plane.
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