Timeless Wings Arsenal VG-70 User manual

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PRINTING AND ASSEMBLY GUIDE ARSENAL VG-70 VERSION 1.2 28 JUNE 2023
SCALE
1/13 (approximately)
WINGSPAN
687mm (27 inches)
LENGTH
797mm (31.4 inches)
FLYING WEIGHT
640g (22.5 ounces)
WING AREA
160 SQ IN
WING LOADING
20 OZS/SQ FT
EDF
X-FLY Galaxy or FMS 50mm EDF or
similar 4S unit
LIPO
4S x 1300mAh

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PRINTING AND ASSEMBLY GUIDE ARSENAL VG-70 VERSION 1.2 28 JUNE 2023
Arsenal VG-70 –history
Shortly after the conclusion of WW2, the French Arsenal company began designing a swept-
wing research aircraft that would incorporate wind-tunnel data acquired from former
Messerschmitt engineers. The required airframe would be the smallest structure that could
fit the Junkers Jumo 004, which was the only available engine at that time.
The result was the Arsenal VG-70, with a fuselage built from metal, along with wooden
wings and tail. The nearly complete airframe was displayed at the Paris Aero Show in 1946,
and ground testing was completed by the end of 1947.
Wind tunnel testing which indicated some potential problems delayed the first flight until 23
June 1948, when it became the second French jet aircraft to fly. After a brief but successful
test-flying career, the VG-70 was retired in early 1949, as it had reached its development
potential, and the much-improved follow-on VG-90 was well under way.

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PRINTING AND ASSEMBLY GUIDE ARSENAL VG-70 VERSION 1.2 28 JUNE 2023
NOTES ABOUT THE DESIGN PROCESS AND PRINTING OPTIONS:
The Arsenal VG-70 files include G-code files and .3MF files for all parts, sliced on the free Prusa slicer
(version 2.5.2).
In the first instance, the G-code files should be generic enough to give acceptable results when
loaded directly on a cartesian printer with at least a 200 x 200 x 200mm build volume, with direct
drive or Bowden extruder, but individual results may vary.
Alternatively, the Prusa slicer is easy to use to load the corresponding part .3MF file as a project, and
to change any applicable settings that are not working for your specific print job. These parts have
not been tested in other slicers and Prusa slicer should be used. Except for the motor mount, canopy
and auxiliary air intake which are in normal PLA, all parts are printed from LW-PLA.
The LW-PLA components were printed with 3DLabPrint PolyLight 1.0 LW-PLA which gave excellent
results. E-Sun PLA+ was used for PLA parts and can be recommended. Other filaments may require a
small adjustment to print temperatures and/or extrusion multiplier to give similar results.
Design methodology:
This model has been designed so that all components are solids and are printed with an outer skin
and internal infill. Depending on variables such as nozzle condition, extruder condition, bed
temperature sensor accuracy, filament condition etc. it may be necessary to tweak some of the print
settings to give the best results. The .3MF files when loaded as a project into Prusa slicer will
populate the Print Settings, Filament Settings and Printer Settings with the generic values generated
by the designer, as well as loading the component STL file.
The drop down “Printer Settings” menu can be used to load the default settings specific to your
printer (such as prime line G-code etc.) Additionally, any changes that you make in the Print Settings
menus or Filament Settings menus can be saved (if desired) under another name from the “Save
current….” icon option adjacent to the drop-down menu boxes at the top left of the Prusa window.
For this model, gyroid infill seems to work best on fuselage components, and cubic infill for the
wings and horizontal tail. Feel free to play around with the settings to achieve the balance of
strength vs skin support that you are comfortable with!
By default, a small amount of part cooling fan is used on all parts. If necessary, better layer adhesion
may be achieved with the fan off, if the print result is acceptable in other respects.
LW-PLA parts should be printed one at a time. Weights and times are just a guide, but should be
close to default file values, and are conservative giving strong parts. Weight saving may be achieved
at the discretion of the builder. In practice extrusion multipliers down to 0.45 and infill down to 4%
may be achieved on a good printer giving a suitable weight saving. The default setting (for most
parts) is an extrusion of 0.5 and infill 6% (Gyroid for the fuselage and Cubic for the wings and tail).

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PRINTING AND ASSEMBLY GUIDE ARSENAL VG-70 VERSION 1.2 28 JUNE 2023

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PRINTING AND ASSEMBLY GUIDE ARSENAL VG-70 VERSION 1.2 28 JUNE 2023
PART F1
•LW-PLA
•Print weight: 1.98g
•Print time: 34 mins
PART F2
•LW-PLA
•Print weight: 23.48g
•Print time: 4hr 14min

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PRINTING AND ASSEMBLY GUIDE ARSENAL VG-70 VERSION 1.2 28 JUNE 2023
PART F3
•LW-PLA
•Print weight: 31.55g
•Print time: 6hr 13min
PART F4
•LW-PLA
•Print weight: 23.57g
•Print time: 4hr 23min

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PRINTING AND ASSEMBLY GUIDE ARSENAL VG-70 VERSION 1.2 28 JUNE 2023
PART F5
•LW-PLA
•Print weight: 32.24g
•Print time: 5hr 59min
PART F6
•LW-PLA
•Print weight: 25.51g
•Print time: 4hr 51min
•4% gyroid infill preset in
G-code and .3MF files

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PRINTING AND ASSEMBLY GUIDE ARSENAL VG-70 VERSION 1.2 28 JUNE 2023
PART hatch
•LW-PLA
•Print weight: 9.55g
•Print time: 2hr 35min
•A brim may be necessary
if print bed adhesion is
not good
PART W1L
•LW-PLA
•Print weight: 20.13g
•Print time: 3hr 49min

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PRINTING AND ASSEMBLY GUIDE ARSENAL VG-70 VERSION 1.2 28 JUNE 2023
PART W1R
•LW-PLA
•Print weight: 20.13g
•Print time: 3hr 49min
PART W2L
•LW-PLA
•Print weight: 12.01g
•Print time: 2hr 21min

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PRINTING AND ASSEMBLY GUIDE ARSENAL VG-70 VERSION 1.2 28 JUNE 2023
PART W2R
•LW-PLA
•Print weight: 12.01g
•Print time: 2hr 21min
PART W3L
•LW-PLA
•Print weight: 6.11g
•Print time: 1hr 32min
•A brim may be necessary
if print bed adhesion is
not good

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PRINTING AND ASSEMBLY GUIDE ARSENAL VG-70 VERSION 1.2 28 JUNE 2023
PART W3R
•LW-PLA
•Print weight: 6.11g
•Print time: 1hr 32min
•A brim may be necessary
if print bed adhesion is
not good
PART L aileron
•LW-PLA
•Print weight: 3.22g
•Print time: 45mins
•8 bottom layers +
extrusion multiplier of
0.7 have been preset in
G-code and .3MF files
•A brim may be
necessary if print bed
adhesion is not good

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PRINTING AND ASSEMBLY GUIDE ARSENAL VG-70 VERSION 1.2 28 JUNE 2023
PART R aileron
•LW-PLA
•Print weight: 3.22g
•Print time: 45mins
•8 bottom layers +
extrusion multiplier of
0.7 have been preset in
G-code and .3MF files
•A brim may be
necessary if print bed
adhesion is not good
PART L wing tip
•LW-PLA
•Print weight: 0.43g
•Print time: 8min

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PRINTING AND ASSEMBLY GUIDE ARSENAL VG-70 VERSION 1.2 28 JUNE 2023
PART R wing tip
•LW-PLA
•Print weight: 0.43g
•Print time: 8 mins
PART L tailplane
•LW-PLA
•Print weight: 6.26g
•Print time: 1hr 20min
•A brim may be necessary
if print bed adhesion is
not good
•An extrusion multiplier
of 0.7 is preset in G-code
and .3MF files

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PRINTING AND ASSEMBLY GUIDE ARSENAL VG-70 VERSION 1.2 28 JUNE 2023
PART R tailplane
•LW-PLA
•Print weight: 6.26g
•Print time: 1hr 20min
•A brim may be necessary
if print bed adhesion is
not good
•An extrusion multiplier
of 0.7 is preset in G-code
and .3MF files
PART L elevator
•LW-PLA
•Print weight: 3.36g
•Print time: 47min
•A brim may help if print
bed adhesion is not good
•8 bottom layers + an
extrusion multiplier of
0.7 is preset in G-code
and .3MF files

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PRINTING AND ASSEMBLY GUIDE ARSENAL VG-70 VERSION 1.2 28 JUNE 2023
PART R elevator
•LW-PLA
•Print weight: 3.36g
•Print time: 47min
•A brim may help if print
bed adhesion is not good
•8 bottom layers + an
extrusion multiplier of
0.7 have been preset in
G-code and .3MF files
PART L tail tip
•LW-PLA
•Print weight: 0.51g
•Print time: 10m

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PRINTING AND ASSEMBLY GUIDE ARSENAL VG-70 VERSION 1.2 28 JUNE 2023
PART R tail tip
•LW-PLA
•Print weight: 0.51g
•Print time: 10m
PART auxiliary
air intake
•PLA
•Print weight: 9.73g
•Print time: 1hr 2mins
•A brim may be necessary
if print bed adhesion is
not good
•Arachne perimeter
generator has been
preset in G-code and
.3MF files

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PRINTING AND ASSEMBLY GUIDE ARSENAL VG-70 VERSION 1.2 28 JUNE 2023
PART motor &
servo mount
•PLA
•Print weight: 10.43g
•Print time: 51min
•Arachne perimeter
generator has been
preset in G-code and
.3MF files
PART canopy
•Natural (clear) PLA
•Print weight: 4.28g
•Print time: 24min

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PRINTING AND ASSEMBLY GUIDE ARSENAL VG-70 VERSION 1.2 28 JUNE 2023
PREPARING THE PARTS FOR ASSEMBLY
LW-PLA parts will need a little cleaning up in places with a sharp blade and/or sandpaper before
assembly. Note that the colour of the material changes (goes lighter) when sanding deeply and can
highlight the underlying structure. At the expense of a slight increase in weight, a coat or two of
water-based polyurethane evens out the colour and gives a significant increase in strength to the
skin.
Medium cyanoacrylate glue used with accelerator is the preferred adhesive for all parts of this
model. As an alternative, Gorilla Clear Polyurethane Glue (the non-expanding kind) has been used
interchangeably on this and several other projects with great success. The beauty of this latter glue
is that you have many minutes of positioning time as opposed to just seconds with CA. This can be
very helpful especially on wing panel alignment or even on control surface hinges. A paper towel
used dry or with isopropyl alcohol removes any residue before the glue sets.
The assembled model is in 6 parts: The forward and rear fuselage sections which are screwed
together and can be separated for fan and servo installation and removal; the hatch which is
magnetically attached for electronics access, and a detachable auxiliary air intake which gives day to
day access to the fan. Finally, two wing halves sit on a carbon spar and are held in place by screws.
FORWARD FUSELAGE ASSEMBLY
•Cut fuselage alignment pins to the lengths shown on the diagram below from 3mm dowel or
carbon rod and insert into formers as shown. Check that all parts fit together snugly. Separate
parts again then apply glue in turn to the front and rear of F2, and the front F4 where it
contacts F3. Carefully reassemble parts and clamp until dry.
•Glue 10mm diameter x 3mm thick hatch magnet into the hole in the front of F4.

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PRINTING AND ASSEMBLY GUIDE ARSENAL VG-70 VERSION 1.2 28 JUNE 2023
REAR FUSELAGE ASSEMBLY
•Take two lengths of elevator piano wire pushrods and push through the pushrod channels in
F5 and F6 until they slide freely. The channels will take up to 1.2mm (0.047in) diameter wire
(optimum), but 0.8mm (0.031in) has been used on one prototype and works OK.
•Cut fuselage alignment pins to the lengths shown on the diagram below from 3mm dowel or
carbon rod and insert into formers as shown. Check that all parts fit together snugly. Separate
F5 and F6 again then apply glue to the front of F6, ensuring glue does not get into the pushrod
channels or on the pushrods . Carefully reassemble parts and clamp until dry.
HATCH ASSEMBLY
•Glue 10mm diameter x 3mm thick hatch magnet into the hole in the rear of the hatch.
IMPORTANT! Make sure that the polarity of the magnet is correct so it attracts the
hatch magnet in F4.
•Place the hatch on a flat surface then glue canopy in place.

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PRINTING AND ASSEMBLY GUIDE ARSENAL VG-70 VERSION 1.2 28 JUNE 2023
WING ASSEMBLY
•Cut wing alignment pins to the lengths shown on the diagram below from 3mm dowel or
carbon rod and insert into holes as shown. Check that all parts fit together snugly. Some light
sanding of mating surfaces with a flat block may be necessary. Note that the wing tips are not
added at this stage to make fitting the ailerons easier.
•Glue parts together and clamp until dry.
AILERON ATTACHMENT
•LEFT Wing underside shown (repeat process for RIGHT wing).
•Cut CA hinge sheet to dimensions in drawing below. Glue to wing first, then aileron.