Case study on the production of low altitude economic sand table model
Project Background
This model focuses on the scenario of "urban low altitude logistics+manned travel", restoring the low altitude economic demonstration zone, including unmanned aerial vehicle takeoff and landing points, eVTOL (electric vertical takeoff and landing aircraft) apron, communication base stations, logistics sorting centers, and simulated routes, with a target restoration degree of 90%. The model needs to reflect the spatial logic of "air ground collaboration", while presenting the technological sense and practicality of low altitude economy through details.
1、 Material selection: "Life oriented industrial style" that is close to real scenes
The core of the material is "easy to obtain+easy to process+high simulation", avoiding professional model materials and balancing cost and realism:
Chassis and terrain: 5mm thick EVA foam board (light gray) simulates urban ground, which is light and easy to cut; Local areas (such as roads and green belts) are covered with imitation asphalt stickers (dark gray with granular texture) to enhance the texture of the ground.
Architecture and Facilities: The main building (logistics center, base station tower) is cut with 3mm thick PVC board and polished with rounded edges; The density board (2mm thick) sprayed with imitation cement paint is used for the apron and takeoff and landing points, and the surface is pressed with fine unevenness to simulate the texture of concrete; Cut small objects such as fences and road cones with ABS plastic sheets (1mm thick) and refine the edges with sandpaper.
Aircraft model: UAV and eVTOL fuselage use foam board (3mm thick) to carve the basic shape, and the surface is covered with imitation plastic stickers (matte white/light blue/gray); The propeller is made of thin bamboo slices (thickness 0.5mm) and the edges are trimmed and rounded; LED beads (miniature) are embedded in the "porthole" position of the body to simulate the operating status of the equipment.
Route and identification: The air route is pulled with fine cotton thread (0.1mm) and fixed above the chassis according to the actual planned path; Ground markings (such as takeoff and landing point arrows, no fly zone borders) should be drawn with waterproof markers or affixed with reflective stickers (which can reflect low light at night).
2、 Production process: precise restoration from "spatial framework" to "dynamic logic"
Chassis and terrain shaping (2 days)
The chassis drawing shall be drawn at a scale of 1:300, and the wood board (5mm thick) shall be used as the base layer, and EVA foam board shall be used to cover the surface. Restore the road trend according to the real city map (paste black electrical tape with hot melt adhesive to simulate the road), trim the foam board bulge (1cm high) in the green belt area with scissors, and cover it with imitation turf stickers (0.5cm high); Use blue glass paper (0.1mm thick) to paste water areas (such as rivers), and use sponge to assist in bending the edges to simulate natural water patterns.
Ground facility construction
Logistics Center: Cut the PVC board into a rectangular frame, use a carving knife to dig out a "loading and unloading port" groove (2cm deep) on the front, and paste a transparent acrylic sheet (simulating an automatic door); Install micro solar panels on the roof (black plastic sheet, with silver glitter simulated photoelectric film attached to the surface).
Communication base station: PVC board is used to build a "tower column", and the top is wrapped with thin iron wire (0.2mm) to form an antenna array (spaced 1cm apart); Stick imitation metal stickers (silver gray with mottled rust) on the tower body to simulate the industrial feel of long-term operation.
Landing and apron: The density board is cut into circular (diameter 6cm) or rectangular (length 8cm x width 5cm) shapes, and the surface is sprayed with dark gray paint (adjusted to matte with water) to simulate cement material. After drying, a template is used to draw "UAV Landing Area" and "eVTOL Parking Stand" signs (white line, width 2mm); Paste reflective strips (yellow, simulating safety warnings) on the edges.
Aircraft and Dynamic Systems
UAV model: foam board carved fuselage (15cm long x 10cm wide x 5cm high), wings cut with 0.5mm thin bamboo pieces (radian is consistent with the real UAV), and transparent tape is pasted on the edge to prevent breakage; The propeller is made of bamboo slices (diameter 8cm), and the base is fixed to the top of the fuselage with white glue. It can be manually rotated with a light tap (simulating standby mode).
EVTOL model: foam board carved streamline fuselage (20cm long × 12cm wide × 6cm high), wings and tail wings are bent with PVC strips (2mm thick) (radian refers to real aircraft); The cabin door is connected by miniature hinges (made of thin wire), which can be opened and closed slightly (simulating the scene of boarding and disembarking passengers).
Route linkage: The cotton thread passes through the preset "route slot" on the chassis and is fixed at both ends to the takeoff and landing point model; A micro LED light (0.3mm) is suspended in the middle of the cotton thread, simulating a "flight path light strip" when powered on at night.
3、 Post processing: using "color hierarchy" to enhance the realism of the scene
The key to the realism of the model lies in the "de artificiality", which integrates layered coloring with the environment, allowing each component to "blend" into the real city background:
Architecture and Facilities:
Logistics Center: The surface of the PVC board is first sprayed with light gray water filled soil (exposing the unevenness of the cutting edge), and then dark gray acrylic (diluted) is used to sweep shadows along the "loading and unloading port" and "roof edge". Finally, the wall surface is lightly swept with a dry sweep method (a small amount of white acrylic+soft bristled pen) to simulate the reflection of cement walls.
Communication base station: the tower foam plate is first painted with white primer, and then painted with dark gray propylene along the antenna support and tower column joints (simulating metal seam); The antenna is wound with thin copper wire (0.1mm), and the surface is dipped with transparent nail polish (brightening) to simulate metallic luster.
Ground and vegetation:
Imitation asphalt pavement: Dip a sponge in dark gray and a small amount of black acrylic (adjusted to matte), lightly tap the road surface (avoiding the marking line), and simulate the natural wear and tear of the unevenness; The road cone is sprayed with yellow acrylic as a whole, and a reflective sticker is pasted on the top (visible in low light at night).
Greenbelt: Spray a small amount of green water-based paint (diluted to 1:5) on the surface of the grass sticker, use a fine brush dipped in dark green pigment to spot dye the "tip of the grass leaf", simulating the natural layering of growth; The trees are twined with fine iron wire with green wool (diameter 0.5mm), and the bottom is inserted with foam board (simulated trunk).
Aircraft details:
UAV: the foam board fuselage is first painted with light beige propylene (simulated plastic material), and then dried with dark gray propylene to draw thin lines along the propeller shaft and wing edges (simulated structural gaps); Paste a miniature orange transparent sheet (0.1mm thick) at the position of the LED bead, which emits warm light when powered on (simulating device operation).
EVTOL: The streamlined body is sprayed with a gradient of light blue and white acrylic (the color becomes lighter from the nose to the tail), simulating aerodynamic streamline light and shadow; The edge of the cabin door is outlined with black acrylic (simulating a sealing strip) to enhance industrial precision.
