Akro-Baby (oz13669)

 

Akro-Baby (oz13669) by Jaromir Pipek 1981 - plan thumbnail

About this Plan

Akro-Baby. Radio control sport aerobatic model. Wingspan 1050 mm, for 2.5 cc engines.

Quote (google-translated from the German): "A model with simple lines, yet beautiful and appealing in its shape, easy to build with little material expenditure and fully aerobatic - that was the goal when constructing the Akro-Baby. All these properties can be certified after extensive testing of the model.

The construction time is approx 14 days with normal 'after-work work', the required amount of wood is small, mainly because the usual wing planking is not necessary. The strength of the wing is sufficient for all aerobatic maneuvers and the associated loads. Thanks to the simplicity of the model, the building instructions can be kept very brief.

Fuselage: The side walls are made of 3 mm balsa, the front and rear area reinforced with 0.8 mm plywood provided with round recesses. Strengthening parts (doublers) are marked with small black triangles on the blueprint. The plywood frames and the engine mount are glued in between the finished side walls (parts 1-5). The fuselage top is made of 3 mm balsa, the bottom is 2 mm balsa.

Undercarriage: We bend the legs in two parts from 4 mm steel wire. The landing gear mount in the fuselage is made of 4 mm plywood. The landing gear is first pushed into the finished and painted or covered fuselage and fastened with two small screwed aluminum clamps. We tie the skid made of 1.5 mm steel wire to a piece of pine strip, resin it with two-component glue and glue it into the fuselage.

Tail unit: The elevator and vertical tail are made of balsa strips 5 x 10.5, 5 x 5 and 5 x 15 mm, the elevator is in the middle with 5 x 5 mm jaw reinforced. We sand the rudder in profile from small balsa sheets with a thickness of 5 mm. Small light nylon hinges serve as a suspension.

Wing: We need hard 5 x 20 mm balsa for the spar, 10 x 10 mm balsa for the leading edge and 7 x 10 mm balsa for the trailing edge. We manufacture the ribs as a block of 3 mm balsa. The wing center piece is planked on both sides with 0.8 mm plywood. From 3 mm plywood we saw the wing connectors that give the wing the V-shape. We sand the strip ailerons from balsa 30 x 10 mm, for the linkage we use a finished part or we bend it from 2 mm steel wire. We cut and sand the edge arches of the wing out of 10 mm balsa.

Engine: With a 2.5cc engine, the Akro-Baby is well powered. In order to achieve the correct center of gravity without any trimming lead, it is advisable to place the battery as far forward as possible. But then the tank must be installed above the battery. The tank is pushed with its cap into the recess of frame 2 and fastened in the corresponding recess in frame 3. All connections are accessible from the engine compartment.

Finish: In its simplest form, the model can be covered with film most quickly. Paper covering of the model, or paper covering for the fuselage and artificial silk for the wings is of course also possible.

Flying: After the model has been adjusted (downthrust 0°, side thrust 2°, wing incidence 0°, EWD 0°) we can take off for the first flight. The model launches from the ground without any problems, hand launching is safer if the grass is too high. Thanks to the 0° adjustment angle difference, the acro baby behaves absolutely neutrally in all flight maneuvers.

For less experienced pilots it is advisable to adjust the wing incidence to 0.5 to 1°, this makes the model slower and much more inherently stable. After you have the Akro-Baby well under control, you can increase the setting angle difference to 0° and then get out of the model what's in it: A lively, agile, fast plane - an aAkro-Baby."

Direct submission to Outerzone.

Supplementary file notes

Article, in German.

Corrections?

Did we get something wrong with these details about this plan (especially the datafile)? That happens sometimes. You can help us fix it.
Add a correction

Akro-Baby (oz13669) by Jaromir Pipek 1981 - model pic

Datafile:
  • (oz13669)
    Akro-Baby
    by Jaromir Pipek
    from FMT
    January 1981 
    41in span
    IC R/C LowWing
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 10/01/2022
    Filesize: 676KB
    Format: • PDFbitmap
    Credit*: plato45
    Downloads: 1545

Akro-Baby (oz13669) by Jaromir Pipek 1981 - pic 003.jpg
003.jpg
Akro-Baby (oz13669) by Jaromir Pipek 1981 - pic 004.jpg
004.jpg
Akro-Baby (oz13669) by Jaromir Pipek 1981 - pic 005.jpg
005.jpg
Akro-Baby (oz13669) by Jaromir Pipek 1981 - pic 006.jpg
006.jpg
Akro-Baby (oz13669) by Jaromir Pipek 1981 - pic 007.jpg
007.jpg
Akro-Baby (oz13669) by Jaromir Pipek 1981 - pic 008.jpg
008.jpg
Akro-Baby (oz13669) by Jaromir Pipek 1981 - pic 009.jpg
009.jpg
Akro-Baby (oz13669) by Jaromir Pipek 1981 - pic 010.jpg
010.jpg
Akro-Baby (oz13669) by Jaromir Pipek 1981 - pic 011.jpg
011.jpg
Akro-Baby (oz13669) by Jaromir Pipek 1981 - pic 012.jpg
012.jpg
Akro-Baby (oz13669) by Jaromir Pipek 1981 - pic 013.jpg
013.jpg
Akro-Baby (oz13669) by Jaromir Pipek 1981 - pic 014.jpg
014.jpg
Akro-Baby (oz13669) by Jaromir Pipek 1981 - pic 015.jpg
015.jpg
Akro-Baby (oz13669) by Jaromir Pipek 1981 - pic 016.jpg
016.jpg
Akro-Baby (oz13669) by Jaromir Pipek 1981 - pic 017.jpg
017.jpg
Akro-Baby (oz13669) by Jaromir Pipek 1981 - pic 018.jpg
018.jpg

Do you have a photo you'd like to submit for this page? Then email admin@outerzone.co.uk

User comments

Hi there, attached are some photos of the Akrobaby [main pic, 008-012]. The orange one is powered by a O.S 20 FS and the yellow one by a O.S 15 FP. They fly very nice. Thank you very much, Gustavo From Brazil
Gustavo Delazaro - 05/07/2022
Hi Outerzone, Another model built from your plan! The Akro Baby [pic 013]. Not yet finished but soon. Best Regards,
Erick Baccus - 03/12/2022
Hello Outerzone, please find here some pictures of my Akro-Baby [pics 014-018] built this year with plan from Jaromir. I made some construction changes. Engine is OS FS30 which is very powerful for this small modell. If you like you can add this link to RC-Network. There is a building thread about this model issued by me: https://www.rc-network.de/threads/akro-baby-von-jaromir-pipek-1981.11994087/
The Akro-Baby is overall flying very good, following all commands very quick and gives high safety feeling to pilot. Only in case of spin, to finish it counterstearing is not enough also engine gas burst is needed. Very nice model for everyday use.
Kind regards,
Thomas - 27/05/2024
Add a comment

 

 
 

Download File(s):
 

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.

 

Terms of Use

© Outerzone, 2011-2024.

All content is free to download for personal use.

For non-personal use and/or publication: plans, photos, excerpts, links etc may be used, provided that full and clear credit is given to Outerzone with appropriate and specific direction to the original content i.e. a direct hyperlink back to the Outerzone source page.

Unauthorized use and/or duplication of this material without express and written permission from this site's owner is strictly prohibited. If we discover that content is being stolen, we will consider filing a formal DMCA notice.