ST1 OWL Flying Videos and Pictures

This model is a mid wing plane. Two open lids making it easy to access the electronics. The wings consist of two parts (left wing and right wing) making it easy to transport. The wing control surfaces are ailerons and also flaps.  ST1 would be all around model that you always want to bring with you to the flying field. With WCL around 10 – 11, it is not only good flying rc plane but also do as sport flying plane and some aerobatic maneuvers.    


Spar Requirement :

– Primary Wing Spar : 1 x 12mm OD and 1000mm long fiber carbon tube (Required).

– Secondary Wing Spar : 1 x 8mm OD and 300mm long fiber carbon tube (Optional) – see Update History section below.

– Horizontal Stabilizer Spar : 1 x 5mm OD and 450 long fiber carbon tube (Optional) – see Update History section below.

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. The numbers are taken from ideaMaker 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:

Free to download following Documents:

Table of Contents

Update History

Fuselage and Horizontal Stabilizer Update
Updated on July 17th, 2021.

Updated the STL files as an option when printing with LW-PLA or ePLA-LW, enforcing the horizontal stabilizer parts with 5mm OD fiber carbon tube  :

– FUSELAGE-7 # P3_H15

– HSTAB-BASE-L-1 # P3_H15

– HSTAB-BASE-L-2 # P3_H15

– HSTAB-BASE-R-1 # P3_H15

– HSTAB-BASE-R-2 # P3_H15

Please use 5mm OD fiber carbon tube with about 450mm length.

Additional 8mm Spar for Wings
Updated on October 21th, 2021.

– This is optional when you feel that you need to add more locked wing attachment positions (see screenshot attachment picture).

– 8mm OD fiber carbon tube is required with about 300mm in length.

Recommended Setup

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, Canopy and Hatch:

For Wings (except the control surfaces):

For Aileron, Flap, Rudder 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. 

3D Printed Motor Mount, Propeller Spinner, Collet and Spar

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.

ST-1 OWL Spinner and Collet Requirement :

1. 50mm Diameter Size Spinner.

2. 5mm or 4mm Shaft Propeller Colet (check your purchased motor shaft to pick the right size propeller colet).

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

Assembly Figures

ST1 Fuselage Assembly

ST1 Wing Assembly

ST1 Horizontal Stabilizer Assembly

ST1 Vertical Stabilizer Assembly

ST1 Canopy Assembly

ST1 Hatch Assembly

ST1 Main Gear Assembly

Watch ST-1 OWL Animation and Assembly Video
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