OWL MDM-1 Fox
Flying Videos PlayList
Not confidence enough hand lunch an rc plane. no worry ! OWL MDM-1 Fox has swappable between its landing gears and main wheel. Whenever you feel confidence enough to throw the plane than you just need to replace the landing gears with main wheel reducing about 150 grams of weight.
If you do not have folding propeller yet, no need to worry also, just use a standard one. You still can fly it and later use the folding propeller when its ready (a 3D printed adapter is provided for this).
The wings is split into left and right wings convenience for transporting. The stands (front and back) for the plane are also provided. Whenever you want to store the plane, just detach the landing gears if you use them, and use the stands for the fuselage. The stand for the wings is also provided.
Now, it is up to you… ready with hand launching !… prepare the plane in its flying position on your hand, push the throttle until you feel that the plane is about to leave your hand (about 80%) and just throw the plane. It flies like an eagle bird…
OWL MDM-1 Fox Flying PlayList
Folding propeller is already available to download
Adapter is provided if you have printed the fuselage with v1.0.
Specification
- Wing Loading : 46.8 - 49.4 gr/dm^2.
- AUW/Flying Weight : 1.800 - 1.900 gr (with battery 2200mah 4s).
- Wing Area : 38.5 dm^2.
- Wing Cube Loading (WCL) : 7.5 - 7.9.
- Flight Performance Category : Trainer Aerobatic.
- Radio Channels : Throttle, Aileron, Flap, Elevator and Rudder.
- Length : 1.222mm.
- Wing Span : 2.388mm.
- Available to Use Standard or Folding Propeller
Spar Requirement :
OWL MDM-1 Fox uses 2 x “10mm OD – 1000mm Long” and 1 x “12mm OD – 500mm Long” Fiber Carbon Tube as Spar.
Since OWL MDM-1 Fox wing require fiber carbon spar, the Wing Parts can be printed with LW-PLA/ePLA-LW for saving more weight.
Center of Gravity (CoG) :
- CoG is 62mm from Wing Root Leading Edge.
- During maiden, please allow 3 - 4mm toward the nose (forward), start with more solid flying and adjust gradually during the next flight.
Use Gear Extension if Not Ready Hand Launching :
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
Nose Heavy Correction Available as an Option
Updated on April 26th, 2021.
- When using heavy spinner and also attaching main gear extension, OWL MDM-1 Fox may end up in nose heavy condition.
- Many ways to make correction for this condition, one of them is to use "FUSELAGE-7 # P3_H15 v1.1" and "FUSELAGE-7-LID # P3_H15 v1.1" instead of "FUSELAGE-7 # P3_H15".
- Use some objects to put more weight into "FUSELAGE-7-LID # P3_H15 v1.1" (you may want to make some trials to achieve optimal weight by temporarily attaching the lid with tape).
- Once optimal weight is achieved, glue "FUSELAGE-7-LID # P3_H15 v1.1" into "FUSELAGE-7 # P3_H15 v1.1" to make the correct shape of OWL MDM-1 Fox fuselage.
- Better to use "FUSELAGE-7 # P3_H15 v1.1" and "FUSELAGE-7-LID # P3_H15 v1.1" instead of "FUSELAGE-7 # P3_H15" in case CoG correction is required later.
5mm Horizontal Stabilizer Fiber Carbon Tube Available as an Option
Updated on October 19th, 2021.
- It is optional to use but better for having stronger and correctly aligned horizontal stabilizer parts.
- Use about 440-445mm fiber carbon tube.
Available to use folding propeller. If you have printed the plane, you just need to print the adapter to use folding propeller (no need to reprint the plane)
Updated on November 3rd, 2021.
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 : 12gr Servos for Aileron, Flap and Rudder and 17gr Servo for Elevator (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.
- Standard 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).
- Folding Propeller Size : depending on your motor KV. For 840 or 790KV above, tried with 11x8, it works great.
- Battery Size : LiPo 4s 2200mah.
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 and Canopy:
- 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 56mm 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 36mm 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 - 1x.
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, Stabilizer, Rudder and Elevator Servos:
- 1.5mm - 2mm rod for creating flap, aileron, elevator and rudder hinges (ER308L - TIG Stainless Steel Rod).
- 1.5mm - 2mm 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 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.
OWL MDM-1 Fox Spinner and Collet Requirement :
1. 70mm Diameter Size Spinner or 50mm Folding Propeller 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
MDM-1 Fox Fuselage Assembly
MDM-1 Fox Wing Assembly
MDM-1 Fox HStab Assembly
MDM-1 Fox VStab Assembly
MDM-1 Fox Canopy Assembly
