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

by wersy, published

"Red Duck" First Take Off of a fully printed flying wing. by wersy Aug 5, 2014
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Summary

My intention was to design a plane up to 3 m wingspan without strengthening by carbon tubes - that means 100% printed.
But I had to stop at 1,35 m because the wing reached already a weight of almost 1,1 kg. My small motor which I used already on my sail plane http://www.thingiverse.com/thing:86982 wouldn't last for much more weight.
Additionelly I thought a flying wing would make less problems to get the CG forwards, because of the short tail. But again I got the same trouble. The big mass of the wing pushed the CG backwards, so I was forced to add a spacer on front. This makes the plane looks a bit like a duck ;-)
Nevertheless I fasten the wing ends just with tape to have the ability to extend the wing span at any time.
Uli Richter - a long standing pilot of the Lufthansa and very experienced in building and flying air plane models - was so kind to fly my wing plane. He had absolutely no problems and showed us immediately a fully acrobatic flight show. Thank you very much for the wonderfull flights!
It was not so easy to follow with the camera all the unexpected maneuver in flight. Therefore the video can't give by far the impression as it was in reality.

http://youtu.be/c6Udkt3NSK0
My Club: http://hackerspace-ffm.de/

Instructions

Specifications
wing span: 1350 mm
wing chord: 336 mm
aerodynamic center: 78.1 mm
aerodynamic center 5% stability: 61.3 mm
wing profil: Clark YS
wing overall weight: 1100 g
wing area: 45,36 dm²
fuselage overall weight 680 g
wing loading: 39,2 g/dm²
longitudinal stability (Thies) STFs: 45,4
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: 81 h
print time fuselage: 35 h
used PLA: 1.4 kg
.
Update 2014/09/29
"fuselage 02 brim.stl" replaced by "fuselage 02 mod brim.stl"
The lower edge of the border is rounded for easier printing.
.
The next days I will give more information.

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I forgot to mention it:
The wing parts need 2 solid bottom and 2 solid top layer.

What fill density and number of shells did you use?

All parts are printed with layer height 0.3 mm, width 0.5 mm.
Wings 1 shell no infill, Fuselage 100% infill.
BTW, did you see the UAV from AMRC University of your city?
I am going to try that... ;-)

Yes, I was actually at the slope site when they turned up with an early version - I think it was their second try. It didn't go well! Every launch ended in another wreck. More tape, try again, Crash.

Still they got it right in the end .

Thanks for the build info.

Aug 12, 2014 - Modified Aug 12, 2014
wersy - in reply to pintokitkat

How come, that you have been present, was it announced?
No wonder, that they had initial problems. This is an Horton princip, which is complex to calculate.
Anyway, my duck did fly at the very first start ;-)

Currently I print parts to expand the wing span to 1.95 m. The total weight will reach 2.2 kg. The wing loading will reduce from 40 g/dm² to 35 g/dm².
Once in the air, I hope it will come down again ;-)

No, it wasn't announced, it was just co-incidental. The team chose to test at our slope site because it is a great site and close to the city centre. I happened to be there slope soaring my wing and they just turned up.

Back to the duck, I tried printing the tail with zero infill and it simply collapsed, so I'm concerned about the skin strength of the wings.I might use a 5% fill.

You mean fuselage 07? I can give you this part without holes in the skin but there are no screw holes yet.
All parts of the fuselage have a skin of 1 mm (2 x 0.5 mm width). This is already very strong. The complete fuselage weighs 300g.
Do you print with PLA? What temperature you use?
I am afraid, if you print the wing with infill, it will take very much time - and the wing will be to heavy.
Better to print with width 0.55 - 0.6 mm, if you are unsure.

Nice work. How did you join the wing pieces together?

All parts are glued with 2 component epoxy.
The segments are absolutely form-fit, so there is no need to align.

Bravo! It's very exciting to watch. He's a fine pilot, indeed.

The wonderful flight is due to the excellent pilot. I was very lucky to had him for the first flight.
I am sure, there is nothing he couldn't fly.

Awesome!
I've been in the process of designing a 3d printed flying wing. Seeing flights like that gives me hope.
Mine will be a swept wing pusher design.
Keep up the good work!

wersy - in reply to 3DMON

My intention is to test the print limits and to show what is possible. Additional to present new methods of construction to give incitation for your design and your own improvements.

Swept wing? I have already something like that in mind...;-)
I'll be looking forward for your design.

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