OWL F-18 Super Hornet 70mm EDF
( Semi Scale Model )
~ LW-PLA Digital Balsa and Foam and PLA Series ~
This OWL F-18 Super Hornet model uses a single 70mm EDF (please visit another OWL F-18 Super Hornet that uses also a single 64mm EDF). This model is a special edition where two sets of STL files and also gcode files are provided intentionally to print with LW-PLA or PLA filaments since their internals are designed differently. PLA design model needs more inner structure compared to LW-PLA design since there is no infill used to support the inner structure. This 70mm EDF version uses 4s 3300mAh or 6s LiPo 2200mAh. It is expected to have 330gr more weight if printed with PLA compared to LW-PLA.
There is no requirement to remove EDF intake lip so that you can reuse your fixed intake lip EDF such as FMS 70mm 6s inrunner motor into the model. Another 70mm EDF model EDF should fit also using the provided generic bracket. To make sure that it will fit into, you can download and print the 70mm bracket before you purchase the model and it is free to download.
We continue releasing the model with a “digital balsa and foam” approach. So far, we are very happy to get feedback from some of our customers when slicing the model designed with that approach. The printed parts are much stronger and still keep the weight about the same as the digital balsa approach. Whenever we feel the model will still fly excellent when printed with PLA, will include the PLA version and this model is one of them (more if possible in the future models). New PLA slicing profiles are introduced specifically for EDF PLA model (we continue improving our profiles). It adds bottom and top solid layers so that the model is more impact resistant during belly landing. During our test, the top and bottom solid layers support significant vertical impacts. To protect from scratches during landing, you may want to use fiber tape (you can find it in details below in this page).
If you are not familiar with hand launching an EDF jet, we would suggest you use our OWLplane Catapult Launcher (it is human free error from throwing the model). During maiden, also suggest using that launcher to get you familiar first with the model. When you have trimmed aileron and elevator control surfaces already, you will have no worry and no need anymore setting the control surfaces at the same time especially when trying to hand launch the model.
Directory for PLA : OWL F-18 Super Hornet 70mm – STL, 3MF and G-code ver 1.0\PLA Set
Directory for LW-PLA : OWL F-18 Super Hornet 70mm – STL, 3MF and G-code ver 1.0\LW-PLA Set
It is not with landing gear model (it is a hand launch or catapult launch type of model).
Videos and Pictures
Flying Play List
LW-PLA Digital Balsa and Foam Series
This is a special edition model where supporting for both LW-PLA and PLA filaments. Infill will be used when using LW-PLA but 0% infill for PLA. Both have their own characteristics and depending on your preferences, you can chose either one to print. Two sets of gcode and STL files are provided since they are designed and sliced according to the type of filaments. To make things simpler and easy to slice, the 3MF PrusaSlicer files are provided. In this edition, other PLA slicer profiles are not provided but if you are familiar with other slicers feel free to slice the PLA STL files with your preferred slicers.
Below is brief explanation about “LW-PLA Digital Balsa and Foam” design approach.
Printing Profiles with Gyroid Infill :
As you can see from the pictures below, they illustrate a 3D printed part when using gyroid infill and ribs. You can pick infill percentage to you preferences where the higher you set it will be stronger. To get optimal result, we also still use ribs so that we will achieve parts using optimal gyroid infill percentage. With having gyroid infill, we have tried to use top and bottom layers. The good news is that the AUW is still acceptable for the jet and allow it to use like lego style blocks to assemble.
We run some research and experiment with some number of setting values for infill percentage. Final values will be used in our OWLplane slicer profiles. Feel free to increase or decrease the values including playing with other settings if you feel better than ours (we are happy listening / getting your input/feedback, so keep us posted about your build in our facebook group).
*) Below is from F16 part for illustration.
Like Playing Lego :
As explained above, click the right side youtube video showing how to assembly the fuselage like playing “lego” blocks.
Expected Some Stringing but Easy to Clean :
Since active foaming filaments such as LW-PLA is not affected by retraction, some stringings are expected. The good news is that they are easy to clean compared to printing with standard PLA/PLA+.
*) below are sample parts from F16 model.
Sandpaper Cleaning the Excessive Materials Surrounding Plug-In Blocks :
Sanding parts would make assembling much easier and also cleaner. Excessive materials can be found on the top surfaces. For example, the circle in the picture need to sand so that there is no need to push the part harder later to fit into the next part.
*) a sample part from F16 model.
Sand The Surfaces To Get Smooth Ones :
Comparing surfaces before and after sending it. LW-PLA material let you smoothing surfaces where it would not be applicable when sanding standard PLA or PLA+.
Specification and Some Details
Spar Requirements :
- 1 x 8mm OD and with 460mm long fiber carbon tube as front fuselage and wing spar.
- 1 x 8mm OD and with 760mm long fiber carbon tube as back fuselage and wing spar.
- 2 x 6mm OD and with 215mm long for horizontal stabilizer spar.
Locking Belt for Attaching Wings to Fuselage :
Aileron/Wing Control Surfaces Rods:
Elevator/Horizontal Stabilizer Control Surfaces Rods:
Canopy Assembly Support Rod and Pins :
See below figures to assembly the Canopy by using 2-2.5mm support rod and provided 3D printed pins.
Electronic Positions :
Feel free to locate the electronics for getting the correct CoG.
70mm EDF Bracket and Installation :
Below pictures show how 70mm EDF installed into the fuselage.
*) Pictures above are from OWL ViperJet 70mm EDF for illustration only.
Two sets of EDF brackets can be used. The one with intake lip removed or the one with intake lip intact.
You can find the bracket STL files under “OWL F-18 Super Hornet 70mm – SUPPORT ver 1.0\EDF BRACKETS”.
*) For illustration only from 64mm EDF
Below showing 70mm EDF and their brackets. You do not need to glue the fixed intake lip EDF into its bracket but you need to screw left and right side arms before attaching to the fuselage so that the bracket will not easily separated from its bracket.
Left side : using screws to attach to the bracket for EDF with fixed intake lip.
Right side : using hot glue for 70mm EDF with no intake lip (removed intake lip).
EDF Hatch Support Rods :
Please insert steel support rods about 1.5mm OD into the provided holes to make parts stronger as shown by the pictures below :
*) Left side picture is for the front side of EDF hatch and right side picture is for the back side of EDF hatch.
*) Pictures above are from SuperOWL Jet 70mm EDF for illustration only.
Elevator Servos Installation :
Please follow step by step below to install the elevator servos into the fuselage. For the brackets, please find them under”OWL F-18 Super Hornet 70mm – SUPPORT ver 1.0\SERVOS\12gr ELEVATOR SERVO BRACKET”.
Note : hot glues is preferred to use instead of CA so that it can be easily replaced whenever necessary (use hot water to remove the servo from its bracket).
Keeping Vase Mode Printing for The Outer Perimeter :
Please cut areas shown on the right side picture for FUSELAGE-5 # B2T2_GR1 printed with LW-PLA filament.
Center of Gravity (CoG) :
How to Launch OWL F-18 Super Hornet 70mm EDF Model :
Recommend to launch the model using catapult launcher. If you wish to launch with our 3D printed catapult launcher, please visit OWLplane Catapult Launcher product page menu under “SHOP & PRODUCT LIST” tab after hovering the mouse over (you can use your own Catapult Launcher so that you just need to print the hook adapter).
Watch the following videos how easy it is to launch the rc model with OWLplane Catapult Launcher and human free errors.
Printing and Preparing OWL F-18 Super Hornet 70mm EDF Launcher Adapter :
If you plan to launch the model with your own catapult launcher, please print the parts shown on the right side from “OWL F-18 Super Hornet 70mm – SUPPORT ver 1.0\CATAPULT ADAPTER\GCODE & 3MF\PLA” for the puller and need to glue the hook bar “F-18 SUPER HORNET HOOK # GR4” from “1. FUSELAGE\GCODE & 3MF” directory.
Feel free to use your own catapult launcher or you can print OWLplane catapult launcher for free.
Optional : Fiber Tape Protecting The Model During Belly Landing
By using fiber tape attached to the belly skin, it will protect a model during landing from rough surfaces. Not only protecting, you may no need to clean the belly after sometime by replacing it to get back clean.
We have tested it and really happy with the result. The model is still in a good condition after landing it on rough surfaces.
*) Using F16 belly part as illustration only.
Some Note for Slicing STL Files – LW-PLA :
Note : please go directly to 3MF files for PLA filament.
Default Value are :
– Retraction : Set enabled only to make “extra restart length = 0.05mm” (PrusaSlicer), “extra restart amount = 0.05mm” (IdeaMaker) or “retraction extra prime amount = 0.5mm^3” (Cura) to compensate loosing materials due to stringing issues.
– Heatbed: 55 degree C.
– Hotend: 245 degree C (you may want to change it between 240 – 250 degree C).
– Extrusion Multiplier : 0.55% (feel free to update this value).
– Extrusion Width: 0.40mm (feel free to find your preference value, but it will be around that value).
– Extrusion Height: 0.25mm (greater is faster but less stronger bonding).
– Printing Speed: 35mm/sec.
– Retraction Speed : 50mm/sec.
Weight and Time Estimation for LW-PLA Only :
Following tables show the weight of printed parts, number of required filament rolls and time required to print for LW-PLA only. For PLA, please go directly to read from PrusaSlicer output information. 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.
Here are the summary table :
Table of Contents
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. 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).