ST-1 OWL
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.
Specification
- Wing Loading : 58.0 - 65.2 gr/dm^2.
- AUW/Flying Weight : 2.000 - 2.250 gr (with battery 2200mah 4s).
- Wing Area : 34.5 dm^2.
- Wing Cube Loading (WCL) : 9.8 - 11.1.
- Flight Performance Category : Sport Aerobatic.
- Radio Channels : Throttle, Aileron, Flap, Elevator and Rudder.
- Length : 1.165mm.
- Wing Span : 1.510mm.
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) :
- CG is 92mm from wing root leading edge.
- During maiden, it is safe to have CG around 92mmm or exactly on the spar. After that, you may want to adjust it as per your preference CoG. It is already considered if miss by couple millimeters.
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:
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 !
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
- Motor Options : 3548 with 790KV/900KV/1100KV motor type (already tested it with 900KV, should work also with 790KV - 1100KV, see options above but not limited to).
- Servo Options : 17gr Servos, 4 x for left and right wings and 2 x for stabilizers (see some options above but not limited to).
- ESC Options : ESC with 60A, just pick your favorite ESC but make sure that rated at least 60A.
- Propeller Size: depending on your motor KV. For 900KV above, tried with 12x6 and also 11x7, it works great (suggestion : choose lower KV to get lower temperature for the same propellers especially when you print the motor mount with PLA and use low quality spinner).
- Battery Size : LiPo 4s 2200ma - 3300mah.
Tools and Materials
- Printer, in general 200mm x 200mm x 200mm (W x L x H) for all OWLplane Models.
- Filament such as PLA, ABS, HIPS and ASA (do not use silk PLA, it tends to be very weak in layer to layer adhesion).
- 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.
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:
- M3 x 0.5mm thread x 12mm screws with their washers for outrunner motor to motor mount wall - 4x.
- Self tapping screw M3x20mm or M2.5x20mm with their washers for mounting motor wall to the fuselage (Fuselage - N0) - 6x.
- 4mm OD and 63mm steel long shaft for main wheel axles - 2x.
- Landing gear wheel stop set collar 9x4.1mm for main wheel axles - 4x.
- 2.0mm OD and 32mm steel long shaft for tail wheel axle - 1x.
- Landing gear wheel stop set collar 9x2.1mm for tail wheel axles - 1x.
- Ballpoint pen spring for Canopy and Hatch - 2x.
For Wings (except the control surfaces):
- 3D printed wing and fuselage pin left and right - 2x.
- 1mm OD aluminum wire with about 40mm length- 2x.
For Aileron, Flap, Rudder and Elevator Servos:
- 1.5mm - 2mm OD rod for creating flap, aileron, elevator and rudder hinges (ER308L - TIG Stainless Steel Rod).
- 1.5mm - 2mm OD rod for flap, aileron, elevator and rudder pushrod (ER308L - TIG Stainless Steel Rod).
- Landing gear wheel stop set collar 9x2.1mm for flap, aileron, rudder and elevator - 6x.
- Linkage stopper D2.1mm for flap, aileron, rudder and elevator - 6x.
- 2.0mm-2.5mm OD shaft for creating pins connecting two parts for aileron, flap and stabilizer.
*) Illustration only
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.
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
