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Dec 17, 2016, 07:01 PM
Lost in the Sky
Richard N's Avatar
A bit more work done. The lighting on the model was poor because I got distracted photographing some other nurflügel (or canards) in my back yard pond and ran out of daylight.
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Dec 17, 2016, 07:14 PM
less is more
Knoll53's Avatar
That is some fine balsa work. Almost a shame to cover it.

Just joking..........COVER IT !
Dec 18, 2016, 08:59 AM
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Knoll53's Avatar
All your pictures are "better" pictures. High quality pics make for a great build log.

From the details, I can see that this is a very light plane. Is there any explanation for the unusual wingtips?

Dec 18, 2016, 10:31 AM
dare to thermal
http://www.epj-conferences.org/artic...m-13_02077.pdf
http://www.das-nurfluegelteam.de/win...nglet_uli.html
Use google picture search "dsa rohr winglet"

/Bernd
Dec 18, 2016, 10:44 AM
Registered User
Hallo!

DSA-Winglet ©Zanonia-Flyers 2014, is the correct name of this wing-tip. DSA stands for Druck-Sog-Ableitung, I try to translate it with high pressure - low pressure discharge. Developed from the Zanonia-Flyers, Hans Jürgen Unverferth und Reinhard Sielemann, they cause a better airflow around the wingtips an the winglets. One of the effects off this wing tips is an outstanding slow-flight behavior.

kind regards

Franz
Dec 18, 2016, 11:09 AM
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Knoll53's Avatar
Quote:
Originally Posted by resdart
One of the effects off this wing tips is an outstanding slow-flight behavior.
As a designer, do you feel that the DSA tip benefit is significant enough to allow you to change other parameters, such as total wing twist? The thought being that as wing twist is reduced overall lift is increased.

Viele Grüße
Kent
Dec 18, 2016, 11:29 AM
Registered User
Hallo!

The wing has a twist of 5°. I think, only the summery of all parameters, airfoil, wing twist, DSA-winglet and so on, allows to use the whole ca-range.
And that is the way it flys:
RES-DART (5 min 51 sec)


kind regards

Franz
Dec 18, 2016, 03:01 PM
Lost in the Sky
Richard N's Avatar
Hello Franz

One other effect of wing twist might be thrust from the lift vector being twisted forward according to the Prandtl-D developers: https://www.rcgroups.com/forums/show...andtl-d/page16.

This flyer I saw near my pond seems to be using wing twist for extra thrust.

Richard
Dec 18, 2016, 04:09 PM
Registered User
Hallo Richard!

I am a hobby model-plane-developer. The zanonia-flyers did a lot of analytical studies and also published some of their research findings in the Aufwind-Magazin.
I learned a lot by trying to fly every possible and every impossible possibility, but i am only able to interpret effects. A wind-tunnel in my garden would be great.

kind regards

Franz
Dec 18, 2016, 07:14 PM
Lost in the Sky
Richard N's Avatar

DSA Rohr Visualization


Here is a video visualization of the flow through a DSA tube compared to a conventional wingtip: http://www.minix.fr/video_minix_swf.htm

It was mentioned in the RC-Network.de DSA-Rohr thread in post 18: http://www.rc-network.de/forum/showt...SA-Rohre/page2
Dec 28, 2016, 06:43 AM
Lee
Lee
PERFECT LANDING !!!
Lee's Avatar
This is an amazing plane as seen in the last video. I found in years of flying slope with flying wings that they turn without burning as much energy as a similar size traditional tail plane. My planes were fiberglass and heavier however. Seeing this lightweight Resdart fly makes me want to build one.

I am surprised that the small amount of air that finds its way through the tube would make that much difference in drag and lift.
Dec 31, 2016, 07:16 PM
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Knoll53's Avatar
Quote:
Originally Posted by Richard N
A bit more work done.
Have you put work on hold until the truly spectacular Springtime soaring conditions roll around to Texas?
Dec 31, 2016, 08:18 PM
Lost in the Sky
Richard N's Avatar
Have the winglets and one wing bottom panel covered. The rest will be done by tomorrow morning. It is going to be calm, sunny, and mild in the afternoon and I think it will be flying then.
Jan 01, 2017, 06:28 AM
Registered User
Hallo Richard!

Please check wing twist and profileshape after covering and follow the manual for your first flight.

Happy new year and a successful maiden

Franz


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