Der Kleine Uhu (oz4247)
About this Plan
Graupner Der Kleine Uhu (1967 version). Free flight towline glider. Wingspan 43-5/8 in, wing area 202 sq in. A1 contest class sailplane model. Graupner Quickie-Kit no 4223.
Note there are currently two listings on Outerzone of Der Kleine UHU. This here is the 1967 version. For the later 1984 version see: Der Kleine UHU (oz14245)
Direct submission to Outerzone.
Update 3/5/2022: Added instructions sheet (full build text in 4 languages, also inc materials list) thanks to Martin Huebner.
Quote: "Der kleine UHU. Quickie Kit. Indent-Nr 4223, sheet #2.
Preface: Der kleine UHU is a beginner's model designed with special consideration for ease of construction and splendid performance. The model meets the contest rules for A/1 class gliders and is equipped with a dethermalizer in cyder to prevent OOS flights. The model is easy to launch with the aid of a towline.
An easy-to-read Quickbuild plan and the photos simplify the build of the model very much. Numbering of the parts follows the sequential order of the assembly of the model.
In order to cut down the building time the material contained in the kit has been profusely prefabricated and several parts have been made of cementable plastic. Cautiously remove all plastic parts singly from their 'tree', using a sharp knife. A surplus dethermalizer horn (13) has been supplied, which serves as a spare for a damaged one.
Cautiously cut out all die-cut parts from the sheets, using a sharp knife or a razor blade; don't try to press them out. Two surplus ribs (18) are provided on die-cut sheets B/2 which may serve as spares for damaged ribs, if necessary. The fuselage center layer is only partially die-cut and is cut out with a scroll or coping saw. Cut plan in two at center (broken lines) for ease of handling.
Building instructions: Tools: This prefabricated kit makes it possible to build the model with very few tools; this is what you'll need:
1. a scroll or fret saw with blades, a working platform and a clamp, to fasten the latter to the workbench
2. a sharp knife, such as indent No.10, and a. razor blade
3. a sanding block with coarse and fine sandpaper, plus a small round file
4. a couple of spring-type clothespins (indent No. 543)
5. some 40 glass-head modelling pins (indent No. 639)
6. a small brush for glueing, a slightly wider one for doping
7. a straight plank for the wing assembly
Fuselage: The fuselage consists of part (1) through (5) and (11). Start assembly by cutting out the fuselage center layer (1). Its outlines are marked by die-cuts, which guide the saw blade. Sand part (1) with sandpaper, then fit tail boom (3) and part (11). Next cement one of the fuselage doublers (2), coloured side outside, and boom (3) to part (1). (Fig.1)
After the cement has thoroughly set the two holes for the wing dowels are drilled through part (2) with a round file. Be sure not to enlarge the holes in part (1), which serve as a guide for the file. Sand off surplus wood at the fuselage center layer/tail boom junction, if necessary.
The second fuselage doubler, again with coloured side outside, is now cemented to the center layer. Until dry the parts are pressed together with clamps. File holes for the wing dowels through second doubler (Fig. 2). Finally sand the fuselage thoroughly, as per plan.
The milled wing platform (4) is then cemented to the fuselage in such a manner that the wing sits perpendicular to the fuselage later on. The wing dowels (5) are cemented in their holes and the rear end of the tail boom is cut off obliquely, as per plan..."
Update 30/11/2022: Added CAD file of all parts, thanks to Tom.
Quote: "Hi, I downloaded the plan of the small 1967 Uhu (oz4247) from your great website. Because I use a laser and CNC I traced the plan in Freecad and formatted it with Lightburn and exported it as a DXF file. To save others the work here is the DXF file so you can add it there."
Direct submission to Outerzone.
Update 14/12/2022: Added two more supplement files thanks to Martin Huebner (see below), the plan and instructions for the wooden version of Der Kleine Uhu.
Quote: "Dear Steve and Mary, concerning Der Kleine Uhu (oz4247) I like to send you this link to some further information with very nice pictures: http://www.koralpe.biz/kleiner%20uhu.htm
The Graupner quick build kit contains some plastic parts that are difficult to obtain even with a 3D printer, see attached picture [pics 006, 007]. Fortunately, there is also a version built completely made out of wood without any plastic parts, see attachment. Note that some dimensions are slightly different compared to the Graupner quick build kit, e.g. the thickness of the fuselage plywood mid part is 5mm instead of 6mm. I regret the poor resolution of the plan and that I only have the relevant instructions in german language. Does anyone have a better copy of it?
Greetings,"
Direct submission to Outerzone.
Note it might be best if we split this here listing into two entries (?): the Quickie kit (inc plastic parts), and the original wooden version. But as we don't (yet) have a good high-res copy of the original wooden version plan, that can wait.
Supplementary file notes
Instructions.
Wooden instructions.
Wooden plan (low res).
CAD file
This plan is available for download in CAD format.
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(oz4247)
Der Kleine Uhu
by Helmut Walther
from Graupner (ref:4223)
1967
44in span
Glider F/F Kit
clean :)
all formers complete :)
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Submitted: 17/04/2013
Filesize: 496KB
Format: • PDFbitmap • CADfile
Credit*: PatrickUrbain, MartinHuebner, Tom
Downloads: 10196
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User comments
It is a very good glider due to the fact it had a large number of molded plastic parts which made it easy to build. Pity the kit is no longer made. I still have the model today & it flies well [pic 003].RichardHenderson - 06/10/2015
Very interesting subject the Kleiner Uhu! From the very beginning it was sponsored by UHU-glues from Germany, their name is also the German word for eagle owl, so the Kleiner Uhu was nothing but a small eagle owl ... There was a big nation-wide contest with this small glider organised by UHU and Graupner, and the model was actually redesigned in 1964, 1967, 1976, 1981, 1984, 1999, 2014 and 2016 (!) For more information have a look at www.flugmodellbau-kirch.de
ArminB - 06/01/2017
Richard's Model is a later mark of this model which has gone thru many variations from the 1950-ies onwards. The plan is for the one of the early 1970-ies whilst Richard's model appeared around 1979/80. Thus, the plan is without a prefabricated forward fuselage and can easily be built from balsa and plywood, given some skills with a jig saw. I built it myself as a kid, more than once, and they flew really well.
Peregrine - 21/01/2019
Addition: If I remember correctly, Graupner continued to produce and sell this specific version as "Pilot", just like they continued the 1956 version as "Sonny", which also is on Outerzone.
Peregrine - 21/01/2019
Hello my dear Outerzone friends. I visit your site every day to see what's new, since a few years ago, when I discovered the page, and I feel now, friend of the house.
In the decade of the 70s I built a UHU of Graupner. The 1967 version. I still keep the original box of the kit, the plan and the instructions, all in German. And the model, of course. My model was heavy, but for my expectations at that age (about 15 or 16 years old), it was flying very well with a line of about 25 to 30 meters.
Years later with time and Autocad through, I redrew the plan to keep a copy that could be printed at will. I must have photos on paper or slides of the UHU at that time, if I find them I will send them to you, in case they are of any use.
I will always remember with dearness that Der Kleine UHU. Since then, many other models was built, including a Keil Kraft Lady Bird (I also keep the box, the blueprint and the original instructions) but that's another story.
Steve, Mary. I thank you for the wonderful work you do, it has allowed me to remember old good times, and I think that same thing happens to many of your followers. I am at your service if I can be useful in some way.
I wish you the best from Argentina.
Hugo Hurrell - 24/05/2019
Hi!, Thank you for make this plans available, I really appreciate it. just my 2 cents on this one, the Description, plan and pictures are wrong. The plan is for the Der Kleine UHU 4223, you have published the pic for the 4234, and decription for the 4247. I have the plans for the 4234 and 4247 and Junior 4241 if you want them.
Gonzalo Enrique Jimenez - 02/03/2022
Hi Gonzalo, yes please, that would be great - email us in everything you have, and we'll put each one up here as a separate listing. Many thanks,
SteveWMD - 02/03/2022
Gonzalo, it seems to me the Graupner plan here is ref 4223, the instructions are ref 4223, and the main pic shows model ref 4223. So all is well. The description, plan and main pic are correct. The only thing on this page that's not straightforward is that pic 003 (from Richard) shows a later model variant, with polyhedral wing layout (as previously mentioned by Peregrine in an earlier comment). I think that's fine. Send us in the later plans, when you get a chance.
SteveWMD - 03/05/2022
About this model saga: https://www.flugmodellbau-kirch.de/Der-kleine-UHU.htm
pit - 03/05/2022
Hi Steve and Mary, there is probably a misunderstanding between the outerzone no. (4247) and the Grauper kit no. (4223).
By the way, here: https://www.ogs-seebach.ch/p/infoseld.php?src=ogstheme2.php&tid=30&sid=319&id=6277 you'll find some additional informations about this cultural famous model. In Germany, even those who have nothing to do with model flying are knowing the name.
Greeting,
Martin Huebner - 04/12/2022
I found a video online of this model slope soaring, real free flight: https://www.youtube.com/watch?v=f3pddSwYjmM
Olivier - 12/12/2022
Here is a photo showing the lasered parts [pic 008] from the CAD file for the 1967 Der Kleine Uhu (oz4247).
Tom - 14/12/2022
and this version of 'der kleine uhu' was designed by Helmut Walther in 1967
Tom - 14/12/2022
Designer Helmut Walther. Got it, thanks.
SteveWMD - 14/12/2022
There is also an RC version of Der Kleine Uhu with video, assembly instructions (all in german) https://www.youtube.com/watch?v=rSRTMMRWtVY&ab_channel=WilfriedStraub , pictures and DXF files here: https://drive.google.com/drive/folders/1y9sVXJffEhn6V7h-1J35aSOF0dFpwY8U
https://www.youtube.com/watch?v=rSRTMMRWtVY&ab_channel=WilfriedStraub
Martin Huebner - 26/12/2022
Add a comment
- Der Kleine Uhu (oz4247)
- Plan File Filesize: 496KB Filename: Der_Kleine_UHU_oz4247.pdf
- Supplement Filesize: 3429KB Filename: Der_Kleine_UHU_oz4247_instructions.pdf
- Supplement Filesize: 4986KB Filename: Der_Kleine_UHU_oz4247_wooden_instructions.pdf
- Supplement Filesize: 197KB Filename: Der_Kleine_UHU_oz4247_wooden_plan.pdf
- CAD Zip Filesize: 60KB Filename: Der_Kleine_UHU_oz4247_cad.zip
- help with downloads
Notes
* Credit field
The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.
Scaling
This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.
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