Zlin Agroturbo RC plane (1100 mm wingspan)

Zlin Agroturbo 1100

Version 1.0 (12.11.2023)

• Wingspan: ca. 1100 mm
• Body length: ca. 750 mm
• Take-off weight: ca. 550 - 650 g
• Motor: Brushless Motor 28mm Durchmesser (2200kV)
• ESC: 30A brushless-ESC
• Propeller: 7*5 ‘’
• Battery: 3s Lipo 800 - 1000 mAh
• Controls: elevator / rudder / aileron / motor
• Center of gravity: 25 mm behind the profile nose
• Deflections:
  aileron: 15-25°, EXPO-setting: 0% für direct response
  elevator: 10-20°, EXPO-setting: 30 - 50%
  rudder: 20-30°, EXPO-setting: 30 - 50%

The model is mainly made of XPS panels (Depron) in 4mm and 6mm thickness.

Additional parts like the winglets, cowling and the nose section of the wing are made using 3D printing.

The XPS parts are manufactured using a CNC milling machine. The working area of the CNC milling machine should have the dimensions 180 mm (x-axis) and 250 mm (y-axis). Since the load on the CNC milling machine when milling the XPS parts is very low, there are no special requirements for the machine and a simple, commercially available version is sufficient.

The model is controlled via all rudders. It has very good-natured flight characteristics. Due to its low weight of approx. 500 - 600 grams, it can be flown very slowly. But aerobatics such as loops, rolls and inverted flight are also possible.

If you decide to build the model, I would appreciate a short report on your experience in the comments or you can contact me via the prusaprinter messenger.
This would help me a lot to improve the design my new models or to fix errors in the actual models.

CNC-desktop mill settings

This video shows the setup of my 3018 CNC milling machine for Balsa and Depron:

My cnc desktop mill has a milling range of 180 mm along the x-axis and 280 mm along the y-axis.
However, many (cheap) CNC desktop milling machines have a milling area that is rotated by 90°, i.e. approx. 300 mm on the x-axis and approx. 200 mm on the y-axis.

This video shows how to rotate gcode files by 90°:

For the CNC files I use the Path Workbench in Freecad.
This video shows how to adapt gcode files to your own CNC milling machine:

3d-printer settings

I placed more than one part on the printplate but they are printed sequetially one by one. This saves a lot of time and reduces stringing when printing in LW-PLA or TPU!

The individual parts should be printed from PLA or better PETG, which has significantly higher thermal stability than PLA.

They are made for a layer height of 0,20 mm to 0,33 mm and a 0,4mm nozzle.

When designing and printing the parts for my RC flight models, I use PrusaSlicer, which can be downloaded from https://www.prusa3d.de/prusaslicer/, to realize special desired properties for 3D printed parts. These properties (e.g. adhesive surfaces or internal support structures) cannot be achieved at all or only with great difficulty using a CAD program alone. 

I do not provide stl-files, but 3mf-files for download. If you still need stl files, I made a short vido on YouTube how stl files can be exported in PrusaSlicer.

Building instructions

I have added assembly instructions to the files for download in PDF format.

Build Videos

Parts required for the build

A few 3 mm screws and various adhesives are required for assembly.

Adhesives:
White glue
5-minute epoxy resin
Superglue, low to medium viscosity

For the elevator and rudder linkages:
Bowden cables (approx. 500mm length)

Steel wire
Steel wire 2 mm: for the chassis

screws
Wood screws 2x10 mm (d x h): 4 pieces

M3x20 mm (d x h): 2 pieces
M3x30 mm (d x h): 2 pieces

Electronic components

Servos
Mini (9g) servos: 4 pieces

Receiver
Minimum: 4 channels

Motor: Brushless Motor 28mm Durchmesser (2200kV)

ESC: 30A brushless-ESC

Propeller: 7*5 ‘’

Battery: 3s Lipo 800 - 1000 mAh