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Old Jun 24, 2012, 11:30 AM
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andrecillo76's Avatar
Heidelberg
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Graubele 4: Antique-Nurflügel from 1936

Hi,

Johannes, Wolfgang (=Quaxi), and me have been busy lately with a remake of an antique wing from 1936, the Graubele 4. Wolfgang had the great idea of making a new design of it for a meeting on ancient rc-models at the club he is flying at. The meeting was yesterday and we managed to have the design ready and flying, and presented two of our three Graubele 4. So much on the background story. Essentially, it is the Graubele 4 from 1936 with a shiny new aerodynamic design.


I though it would be great to share some of the building details with you.

Enjoy,
Andrés
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Old Jun 24, 2012, 11:44 AM
I don't like your altitude
Stupot46's Avatar
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Nicely done Andres.I just Googled it and the Ben Buckle plan came up.Does your "shiny new"design use the same foils?
Stuart
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Old Jun 24, 2012, 11:53 AM
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What a great vintage plane. It looks light. Love the elevons. I'll bet that they are very effective. That big pod makes for a friendly plane with lots of ground clearance for landing. A classic dope and tissue plane. I would be interested in seeing a naked frame construction photo if you happen to have one.

Thanks,
Kent
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Old Jun 24, 2012, 11:57 AM
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Quote:
Originally Posted by Stupot46 View Post
.Does your "shiny new"design use the same foils?
Stuart
Stuart. I'll bet you $10 that it does not.

Kent
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Old Jun 24, 2012, 12:10 PM
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@Kent: Should I wait unitl Stuart agrees? LOL. I'll post some photos later.

@Stuart: we used new airfoils to increase the performance. Ben Buckle states it is from 1937. I was not able to see a date on the plan but I knew it was either from 1936 or 1937. I took my chance with 36 . So the original design is "only" 75 years old...

Andrés
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Old Jun 24, 2012, 12:21 PM
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Quote:
Originally Posted by andrecillo76 View Post
@Kent: Should I wait unitl Stuart agrees? LOL. I'll post some photos later.
Andrés
There goes an easy $10....
Kent
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Old Jun 24, 2012, 01:14 PM
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Germany, Nordrhein-Westfalen, Nettetal
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Here are some links to my first testflight with the No. 2,

The Number 2 was the first build from 3 , but Johannes No. 1 was the first into the air.

Graubele 4 , No.2 - an der Leine (0 min 44 sec)


Graubele 4 , No.2 - 1. freier Flug (0 min 30 sec)


Links from the flight of No. 1

Grauberle 4 Retro Erstflug (0 min 15 sec)


Grauberle 4 Hochstart 1 (0 min 52 sec)


Grauberle 4 Hochstart 2 (1 min 1 sec)


Grauberle 4 Hochstart 2 (1 min 19 sec)


regards

Wolfgang
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Old Jun 24, 2012, 01:53 PM
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These are great videos !

It looks cold and windy there. You are the daring one to fly in such conditions. Nice job handling the wind gusts.

This plane must weight nothing. It climbs like crazy on the high start. Maybe there is helium in the pod?

Love the landing in "Grauberle 4 Hochstart 1 ". It's smooth like a 10 kg scale plane.

I wish I had a pod.

Kent
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Old Jun 24, 2012, 03:46 PM
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Andres,lots of wings from that era.What drew you to this particular one?
Stuart
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Old Jun 24, 2012, 11:59 PM
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Hi,

here's another video from mine:

Antique-Nurflügel Graubele 4 from 1937 (2 min 11 sec)


Go to Vimeo's site for full resolution. This is only a small choice of the flights that made it into the camera. I've had other longer flights, including a high start last Friday night (22:00 - 22:30) with Wolfgang. We even aerotowed the Graubele once. I can tell, that was a wild experience.


@Stuart: It was Wolfgang's choice. He wanted something different, but I do not know the particular reason. Accessibility of the plan? Maybe he can explain this better than me...

Andrés
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Old Jun 25, 2012, 01:07 AM
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Hello Andres,

Nice videos, thank you for sharing them with us. It is always nice to see these classics back in the air. Are these plans available online for download or is it something that must be ordered?

Jens
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Old Jun 25, 2012, 01:36 AM
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Jens,

as far as I know, the original Graubele 4 plans are not available for download. A copy can be purchased at e.g. Ben Buckle's site.

Andrés
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Old Jun 25, 2012, 03:03 AM
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Thank you Andres :-)
Jens
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Old Jun 25, 2012, 09:51 AM
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I have to admit Andres, I like your videos and I like your choice of gliders. We are cut from the same cloth, although your scissors are sharper.

Kent
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Old Jun 25, 2012, 09:58 AM
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Does anyone know the Graubele 7? A picture or a short plan would be nice.

Heinz
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