"Red Swan" the biggest fully printed Flying Wing

by wersy, published

"Red Swan" the biggest fully printed Flying Wing by wersy Sep 6, 2014
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The ugly duckling became a swan. So the fairy tale of Hans Christian Andersen came true.
Yes I know, it didn't become the beauty of a swan, but it has this wonderful flight characteristic. It can glide like a sailplane. The motor was often not in use as you can see on this video, which was taken with a mounted mini cam: http://youtu.be/FHDhLBsC3_M
As I announced on "Red Duck" http://www.thingiverse.com/thing:407766 , I expanded the wing to a wing span of 1950 mm. As expected, the nose had to expand once more. 400g more weight of the wing required a 100 mm longer nose. Otherwise I had to add ballast weight.
This time it was even more difficult to find the plane on the display to follow all the movements, especially the aerobatics which Marcel from http://www.aero-club-nieder-eschbach.de/ had flown perfectly - crowned with a super soft landing.

This is a video with crash landing taken at Inter-Ex 2015. The flying wing was rewarded with the Innovation-trophy:

My Club: http://hackerspace-ffm.de/


wing span: 1950 mm
wing chord: 336 mm
aerodynamic center: 80.2 mm
aerodynamic center 8% stability: 61.4 mm
wing profil: Clark YS
wing overall weight: 1520 g
wing area: 65,52 dm²
fuselage overall weight 730 g
wing loading: 34,3 g/dm²
directional stability (Thies) STFs: 80

motor: Robbe Roxxy BL Outrunner 2834-08
propeller: Aeronaut CAM 10 x 6”
static thrust: 1100 g (3S Lipo)

Print and Material
print time wing: 120 h
print time fuselage: 35 h
used PLA: 1.8 kg

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Yes the Duck it shall be.
I have a 160 gram and a 4250, 245 gram motors, One of which might fit nicely on front of section #2 bolted from the back. I may make a fire wall from conventional material and bolt or screw it in place. i would probably leave the extension out to achieve balance.

I use a 4250 motor on a 48" span foamy plank. Weight is about 4 pounds. Here: https://www.youtube.com/watch?v=hSnHeVC-zBU

I uploaded "flat nose 42.5_test".
Diameter on front: 42.5
Plate thickness: 2.0 mm
One hole in the middle: about 12 mm, not round yet.
No motor camber yet
No side pull yet

Do you think, you can use something like this?
If so, tell me the dimensions you want.

I think I know what you mean. It was originally intended to mount the nose (fuselage 01) directly to fuselage 02. The spacer was necessary for the CG without to need additional weight.
Instead I can make a special shorter nose without slots. Just tell me what screw holes you need and what hole in the middle. If you tell me what outer diameter the plate should have, I can try that too.
BTW, I saw all your videos :-)

Any chance that you might create a flat plate to fit onto section 2? Would allow a larger motor.

I would be very happy, if you print this big one and I will try to modify everything you want..
But I would warmly recommend you to build the smaller "Red Duck". Later, you may enlarge it if you fastened the wing ends just with tape.
The "Red Swan" ist more a glider. It weighs now about 2,3 kg. With this weight you have to land very smooth, otherwise it will behave exactly like a "real" plane...
The “Red Duck” is faster, more agile, and more stable. I think you will be happier with it.

In the meantime I reinforced the middle wing sections. Nevertheless, at InterEx 2016, the wing broke next to it as the right wing touched the ground when landing. Luckily it is easy to repair.
I made the mistake, in order to save weight, painting the contact surfaces with glue only in narrow strips, instead to use the entire surfaces.
I think also, it's not a bad idea to print the middle sections thicker.

Comments deleted.

Thank you for the info, what kind of glue have you used by the assembly?

I use 2 component epoxy glue.
Important is, to slightly sand the contact surfaces.

Hello, what filling rate for the wings ??

No infill, just hollow.
One shell width 0,5 mm, layer height 0,3 mm.

what about placing the rotor behind the wing? many electric sailplanes are using this so you get a better image from your cam

Then I will run in a big problem with the GC and the nose has to be very long.
Here you can see why: http://forums.reprap.org/read.php?238,406825,419423#msg-419423

Very nice. Is it covered in plastic film? Any more part files? I would like to make one.

No, it is not covered in plastic film.
You can take all the other parts from the "Red Duck": http://www.thingiverse.com/thing:407766
The only difference are more wing sections fore more wing span and to take this spacers for a longer nose.

"Red Duck" First Take Off of a fully printed flying wing.
by wersy

Cool mal welche auf Thingiverse zu finden die deutsch sprechen :D
PS:Cooles Flugzeug ist das auch okay für anfänger?

Nurflügel sind nicht für Anfänger zu empfehlen, es sei denn man findet jemanden, der es fliegen kann.
I would not recommend a flying wing to beginners, except you have somebody who can fly it.

Very good job guys!

Thank you very much for the compliment, I am glad you like it.
The next days I will add some general information. Anyway, feel free to ask whatever you want to know.

This is awesome! I loved your previous projects, but this is one of the coolest things i've seen in a while! Would it be possible to write detailled instructions of how you built that beauty?

I am from Switzerland, so chances are higher for me to find the same parts you used, this was a problem I ran in a lot when I tried to recreate american designs...