Little Acro, an RC electric glider with brushless drive
span: approx. 1200 mm
Hull length: approx. 720 mm
Take-off weight (LW-PLA, electric glider): approx. 450-500 g
Functions: Altitude / bank / rudder / motor
Center of gravity: 35 mm behind the wing nose on the fuselage
Rudder deflections:
Aileron: 20-30°, EXPO-setting: 20%
Flaperons: 10° down for landing (and possibly also take-off)
Pendulum elevator: 10°, EXPO-setting: 20%
Motor: Brushless motor 28mm diameter, 25mm length
Battery: 3s Lipo 900 mAh
The Little Acro is a small, trunk-compatible aerobatic glider with electric drive.
The wing is in one piece and attached to the fuselage by a screw connection. It can be easily removed to provide good access to the servos in the fuselage if adjustments or repairs are required.
Thanks to its compact dimensions, the Little Acro can be transported fully assembled in the trunk. So you can simply "go for a quick flight", which was also the basis for this concept.
The Little Acro is not a beginner's model. You should already have some flying experience with aileron models and be able to land a model safely.
I have programmed flaperons (approx. 10° downwards) for landing. This makes the plane significantly slower.
However, the assembly is uncomplicated. Once all the parts have been printed out, the model can be built by an experienced model builder in 15 to 20 hours.
I have described the construction in various videos. I have created a playlist with the construction videos on YouTube:
YouTube: Playlist: Little Acro
A video of the first flight is also available on YouTube:
YouTube: First flight Little Acro
If you decide to build the model, I would be happy to receive a short report on your experience in the comments or you can contact me via the Cults Messenger.
This would help me a lot to improve the design of my new models or to fix bugs in the current models.
Modifiers in PrusaSlicer are used in the print files. These are essential for the stability and structure of the individual parts! The adhesive surfaces for connecting the individual parts are created with the help of modifiers.
Parts required for the assembly
Carbon rods or fiberglass rods and various adhesives are required for the body.
Adhesives:
Superglue, low to medium viscosity
Carbon rods:
Carbon rod 1 mm: 4 pieces (465 mm length)
Carbon rod 1 mm: 1 piece (525 mm length)
Carbon rod 1 mm: 2 pieces (500 mm length)
Carbon rod 1 mm: 1 piece (200 mm length)
Carbon rod 1.5 mm: 2 pieces (1000 mm length)
Carbon rod 2 mm: 1 piece (110 mm length)
Carbon rod 2 mm: 1 piece (125 mm length)
Carbon tube 3 mm: 1 piece (180 mm length)
Carbon rod 0.5x6 mm: 1 piece (450 mm length)
For the elevator pushrod:
Carbon rod 2mm (500mm length)
Steel wire
Steel wire 1 mm: 1 piece (approx. 500 mm length)
Bowden tube
Outer diameter 3mm: 1 piece (approx. 500 mm length)
Screws
Wood screws 2x10 mm (d x h): 20 pieces
Wood screws 2x16 mm (d x h): 4 pieces
M3x10 mm screws: 4 pieces (for motor mounting)
M3 washers: 4 pieces
Electronic components
Servos
Wing: Micro servos (maximum dimensions (LxHxW): 23.5x10x24mm) 2 pieces
Fuselage: 9g mini servo (standard dimensions) 2 pieces
I use metal gear servos.
Receiver
Minimum: 5 channels
Motor
Brushless motor (maximum dimensions (d x H) 28 x 25 mm)
ESC (speed controller)
Minimum: 20A (3-4S)
BEC minimum: 2A