OWL TL-Ultralight Stream

OWL TL-Ultralight Stream Videos and Pictures


Try to avoid printing all parts with 0.40mm extrusion width for getting best experience with the model. If still want to print with that extrusion width than try to print some parts with LW-PLA, ePLA-LW or PolyLight 1.0 such as stabilizers and wings whenever possible/strong enough (both are supported with spars).

OWL TL-Ultralight Stream flying videos posted on the youtube were printed with all PLA+ and 0.32mm extrusion width. It saves significant weight (see the “Weight and Time Estimation – Summary Table below”) !

If printed with 0.3 extrusion width, 3548 outrunner motor is more than enough and if printed with 0.4 extrusion width, 4248 is better (more power). Please note that 4248 outrunner is about 70gr more weight than 3548. 4248 outrunner motor helps on getting correct CoG with less battery weight.

Spar Requirement :

  • Left or Right Wing Spar Only: total 2 x 10mm OD – 500mm long fiber carbon tube.
  • Wing-Fuselage Spar : 1 x 12mm OD – 500mm long.
  • Horizontal Stabilizer Spar (Left and Right) : 2 x 5mm OD – 215mm long fiber carbon tube.

Special Note for Allowing Wing Servo Cables into Fuselage :

  • Cut some areas on the fuselage as shown in the right side figure.
  • 2 areas on the fuselage outer skin and two areas inside the fuselage.
  • Please watch the video for mode details.

Special Note for Allowing Vertical Stabilizer Servo Cables run into Fuselage :

  • Cut small area shown in the picture.
  • It is possible to cut that small area after full fuselage assembly but it would be very careful.
  • Please watch the video for more details.

Installing Servo Bridge for Horizontal Stabilizer Servos :

  • Suggest to use hot glue for quick servo bridge installation.
  • Hot glue is better filling some gaps comparing to CA when attaching the servo bridge.
  • Please watch stabilizer servos installation video for more details.

Warning Regarding Motor Installation :

  • This is seriously critical when installing motor mount ! The Motor Mount wall is already designed to prevent any unwanted move such as sudden pitch down or up when increasing the motor power. The thrust line is designed for certain up or down and also 2 degree right horizontally. The gap will introduce incorrect thrust line causing problem when flying.
  • If your motor can not move freely, try to enlarge the shaft hole on the motor mount and remount the motor right after.
  • If not happy with the default thrust line, feel free to modify it. The motor mount STEP file is provided for you under “SUPPORT\MM” directory. 

Motor Mount Installation :

  • The three dots should face forward.
  • STEP file is provided if you would like to change the thrust line.

FUSELAGE-0 and 1 Version :

Two versions for FUSELAGE-1 and FUSELAGE-2 are are provided. They are for 4mm shaft and 5mm shaft servoless retraction nose landing gears.

  • Left side picture is for 4mm nose landing gear version.
  • Right side picture is for 5mm nose landing gear version.

Nose Landing Gear Pictures :

  • 12gr servo for nose steering.
  • Servoless retraction nose landing gear. 

Special Note where Printed with 0.4mm Extrusion Width :

  • Due to get correct CoG, best to use 4248 650kv than 3548 kv (more weight on the nose).
  • 5-6s battery 2200mAh is suggested to use (weight about 420grams) for that outrunner motor.
  • Right side figure shows 6s 2200mAh battery from 2 batteries 2s 2200mAh and 4s 2200mAh in series with total weight is about 420gr.
  • Suggested propeller to use is 12×6.

Center of Gravity (CoG) :

  • CoG is 126mm from wing root leading edge.
  • 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. The numbers are taken from S3D slicer calculation. From experience, actual numbers show about -5% less than depicted in the table. 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. 

For sure the relative number are useful when deciding to accept the total strengths or weights when printing. Picking higher strength to some parts are necessary to avoid breaking during high impact landing or sharp maneuver for example.  

Here are the summary tables:

Table of Contents

Update History

No Update for this model yet

Recommended Setup

Printed with 0.4<x>mm extrusion width (either 0.4mm nozzle or 0.3mm nozzle) – more weight needed on the nose side.

  • Outrunner 3548 : required battery weight around 550gr.
  • Outrunner 4248 : required battery weight around 420gr.

Printed with 0.32mm extrusion width (either 0.4mm nozzle or 0.3mm nozzle) – less weight needed on the nose side.

  • Outrunner 3548 : required battery weight around 400gr.
  • Outrunner 4248 : required battery weight around 300gr.

How to Select Servoless Retractable Landing Gear and Oleo Legs

Battery Protector and/or Weight Balancer Holder for 2200mAh 3s/4s and 3300mAh 4s Battery :

One of challenges in 3D printed plane is where it has a wide range of possible total weight result. For example, the plane printed with 0.40mm comparing to 0.32mm extrusion width may end up the CoG moved about 2cm – 3cm backward with using the same battery. You may need to move the battery forward or add more weight at the nose to get back the CoG to its previous location. To solve this issue at the same time protecting your battery, the following STL files are created for your 2200mAh 3s/4s and 3300mAh 4s. Feel free to download and use the files (G-code files are also provided for Bowden or Direct Drive setup including STEP files).

Tools and Materials

OWLplane Printers (for your ref.)

See figures below some printers used, created, developed and modified by OWLplane. Two group printers are set, the first one is utilized only for printing PLA/PLA+ and the other one is utilized to print with ABS, ASA and HIPS filaments (the one with enclosures). Just hover onto the figures to find more information about them.

Modified all Bowden setup printers into Direct Drive but leave Tevo Tornado and Anycubic Mega as is (still in bowden setup).

Hardware Needed

For Fuselage and Hatch:

For Wings (except the control surfaces):

For Aileron, Flap, Elevator, Nose Gear Servo and Rudder 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.

3D Printed Motor Mount, Propeller Spinner and Collet

Motor Mount Requirement

Motor mount wall should be 3D printed with more heat resistance filaments such as ABS, ASA or HIPS. If your 3D printer does not have enclosure you may want to try with PETG filament (more heat resistance than PLA/PLA+). In case you still would like to use PLA, please do annealing process (not sure can do for standard PLA), some successful with HT-PLA/Hight Temp-PLA. Click here for you to read about annealing article.

Motor Mount
Propeller Spinner and Collet Requirement

OWLplane does not provide STL file for printed propeller spinner due to our concern about strength, shape and uniform weight when spinning at high speed. Not all 3D Printer has really free of skew issues for all their axes. The skew issue generates uneven shape that will lead to problem when spinning. Good spinner should be available in your local hobby store or online store, even that spinner, you still need to balance it before using it.

Spinner and Collet Requirement :

1. 56mm diameter size spinner.

2. 5mm or 4mm shaft propeller collet (check your purchased motor shaft to pick the right size propeller collet).

Please watch the following Videos to balance your Propeller and Spinner:

Assembly Figures

TL-Ultralight Fuselage Assembly

TL-Ultralight Wing Assembly

TL-Ultralight Horizontal Stabilizer Assembly

TL-Ultralight Vertical Stabilizer Assembly

TL-Ultralight Canopy Assembly

TL-Ultralight Hatch Assembly

Watch TL-Ultralight Animation and Assembly Video
Please visit the page for having visual learning