EL-39 - Semi scale RC jet for 120 mm EDF
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3D model description
Added a new EDF housing that can use the HET motor without any heatsink because the heat sink can be hard to find now. EDF-housing04-Noheatsink.stl
It supports the motor all the way through and has a gap for air to pass around the motor. It should be printed from a more heat resistant material than PLA, and that goes for the impeller as well because the lack of an extra heatsink can raise the motor and axle temperature to where the PLA will start to soften.
Added a new canopy that is one main piece instead of two for printing in a very large printer (in addition to the front windshield part). The new files are Canopy01-onepiece and canopy02-onepiece.
The human is not included.
Length: 1858,5 mm
Wingspan: 1451 mm
All up weight: 7,2 kg (prototype #1), 8 kg (prototype #2), 7,5 kg (prototype #3)
CG: 83-103 mm from the leading edge at the wing joint with the gear in the up position. There is a protrusion on the top of each wing surface to indicate the safe 83mm/25% MAC position. Gear up or down should make little difference because of the low weight of the nose gear. The prototype maidened with CG at approximately 90 mm. 103 mm CG has been tested and flies very well.
Initial control throws:
Elevator: Up 18 mm / Down 16 mm
Ailerons: Up 20 mm / Down 15 mm
Rudder: 15mm / 15 mm
Use 30% exponential on all surfaces to reduce center sensitivity.
Appropriate pilot figure:
Video of the prototype without flaps:
High speed fly bys and landings compilation:
Various flight videos:
Build notes and BOM is moved to the text file BuildNotes.txt because of new limitations on Cults when i updated the page 17.11.2020.
3D printing settings
Most parts should be printed with one 0,4 mm perimeter only and no infill off course. The exceptions are hinge pieces, small parts and landing gear parts which should be printed with many walls or solid infill.
EDF-housing should be printedwith 100% infill and with three perimeters.
EDF-impeller should be printed with 6-8 top and bottom layers and 6-8 perimeters and 0% infill.
Fuselage-parts need 3 bottom layers and six top layers for the most part.
I recommend that Nose03 be printed with two perimeters for the first 120 mm so that the gear mounts are strengthened.
Fanrail01 need to be printed solid if you plan to drill them for an aftermarket EDF.
Maingearmounts01 should be printed with six perimeters and twenty top layers to give something for the retract mounting screws to grab on to. Bottom layers can be just four or five. Infill isn't important. Iuse zero infill.
Maingear01-02 should be eight 0,4 mm perimeters, twelve top and bottom layers and at least 50% infill. The same goes for the nose gear parts.
- 3D file format: STL, TXT, and ZIP
- Last update: 2021/07/22 at 16:08
- Publication date: 2018/06/14 at 23:34
Norwegian inventor/designer/cat owner.
Please don't ask for original design files or parametric files.
If you ask a question about a design, ask under the design so that I can answer there.