Bill of materials summary
Summary¶
The libdrone Pro bill of materials is entirely composed of commercially available components with no proprietary dependencies. Every item has a documented alternative or substitute. The full BOM is maintained in the shopping list document; this article provides the cost and category summary for procurement planning. A single-frame flyable build (no goggles) costs approximately 18,000 CZK. A complete two-frame build with HDZero Goggle 2 costs approximately 34,000 CZK. The sensor payload (air quality mast) adds approximately 2,650 CZK.
Concept¶
Cost structure¶
The cost breaks into six categories:
Video system (~19,300 CZK for two-frame with goggles) — the HDZero Goggle 2 (15,500 CZK) is the single largest line item and is shared across both frames. The VTX + camera (3,800 CZK) is per-frame. For multi-frame deployments, the goggle cost is amortised across all frames.
Electronics core (~8,050 CZK per frame) — FC, ESC, motors, GPS, receiver. These are the components most likely to be sourced locally from Czech hobby suppliers for reduced lead time.
Batteries and charging (~4,300 CZK) — three 6S packs plus charger. Budget scales linearly with the number of packs required for the operational profile.
Mechanical and consumables (~2,200 CZK) — screws, standoffs, connectors, O-rings, conformal coating, Loctite.
Filament (~1,000 CZK in stock) — PC-CF, PETG, ASA, TPU. Assuming a Prusa CoreOne printer with hardened nozzle is already available.
Sensor payload (~2,650 CZK, deferred) — SEN66, ESP32-S3, SD module, I2C cables. Not required for flight.
Make vs buy¶
The structural frame components (arm shafts, sandwich layers, Platform, Backplane, bumpers) are printed — approximately €16 in filament per frame. The same geometry in machined carbon fibre or injection-moulded nylon would cost ten to thirty times more. The printability is a cost advantage, a repairability advantage, and a customisability advantage.
There is no buy option for the frame. This is by design.
Reference¶
Cost summary by category (single-frame build with goggles)¶
| Category | Approx cost (CZK) | Notes |
|---|---|---|
| Video system (VTX + Goggle 2) | 19,300 | Goggle shared across frames |
| FC + ESC | 3,200 | Matek H7A3-SLIM + Pilotix 75A AM32 |
| Motors (×4) | 2,400 | BrotherHobby Avenger V2 2507 |
| GPS + receiver | 1,050 | Matek M10Q + RadioMaster RP2 |
| Propellers (2 sets) | 850 | HQProp 6×3×3 + 6×2.5×3 |
| Batteries + charger | 4,300 | ×3 packs + HOTA D6 Pro |
| Power components | 357 | Buck, TVS, caps, ferrites |
| Mechanical + consumables | 2,200 | Screws, O-rings, coating, Loctite |
| Filament (in stock) | ~1,000 | PC-CF, PETG, ASA, TPU |
| Single-frame with goggles | ~34,657 CZK | |
| Less goggles (second frame) | −15,500 | Goggle not repeated |
| Second frame incremental cost | ~7,000 CZK | |
| Sensor payload (deferred) | 2,650 | SEN66 air quality mast |
Key suppliers (Czech Republic)¶
| Supplier | Items | Lead time |
|---|---|---|
| HobbyDrone.cz / RCStudio.cz | FC, ESC, VTX, goggles, GPS, receiver, props | 7–10 days |
| Laskakit.cz | Buck converter, standoffs, passives | 2–3 days |
| AliExpress | Motors, batteries, hardware, O-rings, connectors | 10–15 days |
| Prusa.shop | Filament, nozzles, bed consumables | Next day |
| Farnell CZ / RS Components CZ | Conformal coating (HPA200H) | 2–3 days |
| Carbonrods.cz / RCProfi.cz | 2.0mm CF rods | 3–5 days |
Component substitutions (documented)¶
All critical components have documented substitutes in the hardware reference: - FC: any Betaflight-supported H7 board with 6× UART - ESC: any 4-in-1 6S AM32 or BLHeli_32 unit with BiDShot telemetry - GPS: any u-blox M8/M9/M10 module with magnetometer - ELRS receiver: any ELRS 2.4GHz receiver (bind phrase matching required) - Props: HQProp 6-inch variants — pitch choice affects calibration
Procedure¶
Rationale¶
Why the BOM is public and maintained¶
A BOM that is not public requires the buyer to trust the seller's claims about component sourcing and supply chain security. For institutional procurement in security-sensitive contexts, this trust is not a substitute for verification. The libdrone BOM is public, sourced from documented suppliers, and uses components whose specifications are publicly verifiable. An institution can audit the supply chain independently.
Connections¶
requires: - platform-overview related: - procurement - lipo-batteries - floating-motor-mounts - easa-open-category leads_to: - regulatory-overview