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.
OWL L-39 Flying PlayList
Specification
- Wing Loading : 65.2gr/dm^2.
- AUW/Flying Weight : 750gr (with battery 1800mAh 4s).
- Wing Area :11.5dm^2.
- Wing Cube Loading (WCL) : 19.3.
- Flight Performance Category : Racer.
- Radio Channels : Throttle, Aileron and Elevator.
- Length : 778mm.
- Wing Span : 762mm.
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) :
- CoG is 54mm from Wing Root Leading Edge.
- During maiden, please allow 2-3 mm toward the nose (forward), start with more solid flying and adjust gradually during the next flight.
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:
Klipper Firmware Does Not Accept “#” / Hash Character
Unfortunately the Klipper firmware does not accept the “#” / hash character when naming the file. More and more 3D printers nowadays and upcoming most likely will use the Klipper firmware where when using previous firmware such as Marlin, Prusa, etc. do not prevent it from processing.
Since our naming convention for our g-code files utilize the “#” character and already since we started the OWLplane, we still keep them until our new release models dated after July 2024 (after BD OWLjet 70mm 6s EDF).
No worry, to use our g-code files, just need to remove the “#” character, that is it !
Fore example :
“FUSELAGE-1 # P3_H15″ replace the file name with “FUSELAGE-1 P3_H15”
Note : no “#” character is used in the new file name.
How To Extract Our Zip Files
Somehow when the folder path is too long, files and directories can not be extracted directly to a destination directory. There is a workaround for this, just follow the guide below. What you need to follow is to double click zip file until you find the directory. From there, double right click to invoke a “copy” command. After that, just paste the directory into your destination directory. That is it !
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 :
– LOCKING_BELT # G3
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.
Recommended Setup
- Motor Options : 50mm EDF 4s shown above. It may be possible powered by 3s type of EDF but not yet tested.
- Servo Options : 2 x 12gr servos for aileron (left and right) and 1 x 12gr servo for elevator.
- ESC Options : ESC may be enough with 40A but better to use 50A.
- Battery Size : LiPo 4s 1500mAh - 1800mAh.
Tools and Materials
- Printer, in general 200mm x 200mm x 200mm (W x L x H) for all OWLplane Models.
- Filament: LW-PLA from ColorFabb, ePLA-LW from eSUN and PolyLight 1.0 from 3DLabPrint.
- CA glue with accelerator. Use thick glue to join surface to surface. Use thin CA glue for coating the joint surface areas.
- Velcro sticker/polyester hook and loop peel-n-stick self-adhesive for locking the battery.
- Fine sandpaper.
- Sharp knife.
- Screwdriver and/or allen wrench for chosen screws/bolts.
- Pliers, needle-nose pliers, nippers.
- Steel bolt cutter.
- Dremel/rotary tool for cutting carbon fiber tubes and rod with more than 2.5mm.
- Electric drill, its drill-bit size from 1.5mm - 5mm and step cone drill.
- Propeller shaft reamer or hole puncher reamer.
Hardware Needed
For Fuselage and Canopy:
- Self tapping screw M3x25mm or M2.5x25mm with their washers (optional) for mounting left and right wings including fuselage lid - 4x.
- Ballpoint pen springs for Canopy - 1x.
For Aileron and Elevator Servos:
- 1.5mm - 2mm rod for aileron and elevator hinges (ER308L - TIG Stainless Steel Rod).
- 1.5mm - 2mm rod for aileron and elevator pushrod (ER308L - TIG Stainless Steel Rod).
- 2-2.5mm rod for horizontal stabilizer hook (ER308L - TIG Stainless Steel Rod).
- Landing gear wheel stop set collar 9x2.1mm for aileron and elevator - 3x.
- Linkage stopper D2.1mm for for flap, aileron, rudder and elevator - 3x.
- 2.0mm-2.5mm OD shaft for creating pins connecting two parts for aileron and stabilizer.
*) Illustration only
Assembly Figures
L-39 Fuselage Assembly
L-39 Wing Assembly
L-39 Horizontal Stabilizer Assembly
L-39 Vertical Stabilizer Assembly
L-39 Canopy Assembly
