OWL L-39 50mm EDF
(Semi Scale Model)
~ LW-PLA/ePLA-LW/PolyLight 1.0 Series ~

OWL L-39 Videos and Pictures

If you do not want to get hassle preparing an rc jet plane at the flying field after arriving (all already well prepared at home)… just grab the plane, put the battery in, throw it and fly.  Woooooss… from left ….woos from right and the total cost to build is relatively cheap, this 3d printed rc plane may be your best choice. With cool looking shape copying form L-39 model, this OWL L-39 not only fly great but also beautiful in the air. It is semi scale plane where the wing ratio is longer than the L-39, intentionally to achieve max fun flying it. Three size wings are provided short, medium or long ones. You can change the wing to the same fuselage since wings are attached to the fuselage with two screws. It is your choice that you can permanently attaching the wings into the fuselage by gluing them for more solid attachment (suggest to bring CA glue with you in case the wing attachment parts get broken after hard landing).

This model must be printed with LW-PLA/ePLA-LW/PolyLight 1.0 filament only. 

Please note that G-code files generated from ideaMaker does not compatible to use with Prusa original 3D printers. Please use Cura or S3D instead if you would like to regenerate the G-code files for your Prusa printers.


Medium Wing Version

Long Wing Version

Short Wing Version 

(Added into the repository on Dec. 9th, 2021)

Spar Requirement :

  • 2 x 5mm OD and with 265mm long fiber carbon tube as primary and secondary fuselage and wing spar.
  • 2 x 5mm OD (left and right spar) and with 315mm or 325mm long for short or long wings respectively.
  • 1 x 5mm OD and with 340mm long for stabilizer spar.

Elevator Hook Requirement :

Electronic Position :

Feel free to position the electronics to get the correct CoG.

EDF Installation and Canopy Trim :

How to Launch OWL L-39 50mm EDF Model : 

Two methods are suggested to launch the model. The first one is to use OWLplane Catapult Launcher. Please visit OWLplane Catapult Launcher product page under “PRODUCTS” tab after clicking “ALL PRODUCTS”. You may want to download and print the 3D printed parts. The second one is by hand launching. 

It is recommended to launch the model by utilizing your own launcher or OWLplane Catapult Launcher since it is human error free.

#1 – By Utilizing OWLplane Catapult Launcher.

If you plan to launch the model with your own catapult launcher, you may still want to download the model hook profile adapter from OWLplane Catapult Launcher repository/product and its free.

#2 – By Throwing.

Follow the following tips to launch :

– Lean your body backward.

– Start throwing by also moving your body forward.

Center of Gravity (CoG) :

Weight and Time Estimation :

Following tables show the weight of printed parts, number of required filament rolls and time required to print. But the number may vary from printer to printer due to:

– Stepper Jerk value.

– Stepper Acceleration value.

– Steps per unit (either calibrated or uncalibrated).

– Extruder quality/condition.

– Nozzle quality/condition.

– Filament quality/condition.

– Etc. 

Here are the summary tables:

Table of Contents

Update History

Adding One More Wing Version – release as Version 1.1.

Updated Date: December 9th, 2021.

Shorter wing version is added into the repository. The shorter wing version is more scale look alike real L-39 comparing to other wing versions.

Some short wing parts are available under “OWL L-39 – Shorter Wings” Directory.

To assembly left wings base is as follow:

  – WINGS-L-1 # P3_H15.

  – WINGS-L-2 # P3_H15.

  – TANK-L-1 SHORTER VER # P3_H15.

  – TANK-L-2 SHORTER VER # P3_H15.

Note : no need to include WINGS-L-3 and R-3 short or long version anymore and similar assembly for the right wing.

– There is no change for Aileron Parts.


Locking Belt for Having 2 more Screws Attaching the Wings – released as version 1.2.

Updated Date: January 11th, 2022.

With locking belt, attaching the Wings to the Fuselage not only with 2 screws but with total 4 screws. It makes the Wings attachment solid to the Fuselage.

Updated STL files :

– FUSELAGE-2 # P3_H15 v1.2

– WINGS-L-1 # P3_H15 v1.2

– WINGS-R-1 # P3_H15 v1.2

Added STL file :


Adding Internal Ribs for “WINGS-L and R-1 # P3_H15” Parts – released as version 1.3.

Updated Date: February 18th, 2022.

With additional ribs on “WINGS-L and R-1 # P3_H15”, they will better maintain their shape.

Updated STL files are:

– “WINGS-L-1 # P3_H15 v1.2” upgrade to “WINGS-L-1 # P3_H15 v1.3”

– “WINGS-R-1 # P3_H15 v1.2” upgrade to “WINGS-R-1 # P3_H15 v1.3”


Creating Two Tabs for “CANOPY-2 # P3_H15” – released as version 1.4.

Updated Date: October 8th, 2022.

Updated STL file is “CANOPY-2 # P3_H15”, upgraded to “CANOPY-2 # P3_H15 v1.2”

The created two tabs are for centering the canopy.

Recommended Setup

Tools and Materials

Hardware Needed

For Fuselage and Canopy:

For Aileron and Elevator Servos:

*) Illustration only

Setup for Servo Travel/Throw

Suggested setup for medium travel/thrown are depicted below and you may adjust the setup according to your need.

Assembly Figures

L-39 Fuselage Assembly

L-39 Wing Assembly

L-39 Horizontal Stabilizer Assembly

L-39 Vertical Stabilizer Assembly

L-39 Canopy Assembly

Watch OWL L-39 Animation and Assembly Video
Please visit the page for having visual learning