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Old Jul 23, 2015, 09:50 AM
Knoll53 is offline
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That is one skinny wing !

I wonder if I could make a zig zaggy turbulator strip from adhesive foam tape and pinking shears? Might be worth while for my skinny wing.
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Old Jul 23, 2015, 02:25 PM
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Quote:
Originally Posted by iron eagle View Post
Uwe, nice plane and video.
Music was perfect as well.
The music was OK, but considering the title of the video (and the name of the plane) I would have chosen something a bit different...
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Old Jul 23, 2015, 10:01 PM
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"Silent Wings of Freedom"?
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Old Jul 24, 2015, 02:38 PM
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a wing is enough
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Quote:
Originally Posted by Fly Wheel View Post
I would have chosen something a bit different...
In Germany this is not so easy because we have the GEMA that prohibits many titles also for non-commercial use as in private videos of model flight because of copyright.

Quote:
Originally Posted by Knoll53 View Post
That is one skinny wing !

I wonder if I could make a zig zaggy turbulator strip from adhesive foam tape and pinking shears? Might be worth while for my skinny wing.
Kent, the 1:2 AK-X uses the turbulator strip because in the downsized version it uses the same laminar profiles of the large man carrying version.
The turbulator balances the effects of the different Re-number, especially the location of the transition point between laminar an turbulent and suppresses the formation of laminar separation bubbles.
Turbulators work very well at low reynold numbers of our model airplanes when the strip has a thickness of 0.3 - 0.6 mm.
The AK-X 1:2 model use turbulator strips of man carrying Sailplanes to be sure of the effect. The thickness is between 0.5 to 0.85 mm:
http://www.brodbeck-flugzeugbaender.de/produkte.html
The point is to find the right position for the desired effect and to know what the desired effect is

http://www.rc-network.de/forum/showt...lieg-Karlsruhe

http://www.rcgroups.com/forums/showthread.php?t=2462032


Regards, Uwe.
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Old Aug 28, 2015, 10:44 AM
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Hi everybody,

it's been a long time since I posted here. Many things changed since then, but not my love for Nurflügel . A couple of years ago, I decided to built a Horten microlight airplane, which I baptized "Schneewittchen". I've been working on it regularly, including the aerodynamic and structural design, but also less theoretical things, such as a mockup . By the way, a real airplane is so much more elaborate than an rc-model... After moving into a new city and a new home, I have now a nice workshop to work further on the project.

I decided to make a blog for those who would like to keep updated:

https://hortenmicrolight.wordpress.com/

I'll try to post from now and then also here on how it is going... I attached a couple of photos of the mockup.

Cheers,
Andrés
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Old Aug 28, 2015, 11:06 AM
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You know nothing....
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Thanks for the link Andrés,will be following you progress.Are you "borrowing"from the Hortens with regard to control stick/pedal position?
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Old Aug 28, 2015, 11:16 AM
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This is great Andrés !

Yes, full sized aircraft are more complex with a higher design standard than models. But it is the designer's decision as to just how much effort goes into each stage of development.

I still remember clearly, speaking to an engineer/builder/pilot, in 1988, as he strapped into his hand made bamboo and plastic sheeting Rogallo hang glider. He used clear packing tape to attach the plastic sheeting to the bamboo frame. It was a simple aircraft ! He launched and flew fine, always with a low angle of attack. No attempt to soar the cliff, but still he was 100' above the beach at one point. BTW, he launched from the same spot from which I fly my RC today. Indeed I later went on to fly hang gliders from this spot, then later got diverted to RC...............which took over completely.

I found this guy quite inspirational and a good demonstration that you do not need to have NASA funding to design/build/fly.

Back in those days, the popular hang gliding adage was "Never fly higher than you're willing to fall." This was actually possible with early slow hang gliders while flying at a low sloped sand dune.
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Old Aug 28, 2015, 01:29 PM
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Hmmm the bamboo butterfly .
But how would it be replicated in aluminum
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Old Aug 29, 2015, 11:59 AM
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@Jon Snow: I'm thinking of a more or less conventional position: drag ruder and tailwheel with pedals, one central stick for the elevons and spoilers separatelly on a cable with springs deployed by hand. BTW, the Horten brothers varied quiet alot the control position in their builts. The most unusual was probably the Horten IV/VI.

@Kent: I'm impressed! This looks pretty much like in the early days of aviation . Sure, the effort put into an experimental airplane is much less than for an airliner, but here in Germany there are regulations and standards for everything . The difference in the precedure between an own experimental aircraft and a commecially distributed kit is marginal . I guess that bamboo-plastic glider would have never tasted air legally in Germany

Cheers,
Andrés
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Old Aug 29, 2015, 01:03 PM
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Quote:
Originally Posted by andrecillo76 View Post
but here in Germany there are regulations and standards for everything .
Yes back in the 1978, poor enforcement of regulations played a key role in our decision to fly. Somehow we survived. ( BTW the bamboo glider was 1978, not 1988). I took a look at the modest, 69 page, LTF-L handbook...........you have a lot of work ahead of you!

This is a really exciting project.
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