The Hardware Ledger
The Hardware Ledger is a learning environment and sharing site, not a business. Explore UAS and hardware projects, practical calculators and lessons learned.
Systems, evidence and operational reality
Technical analysis of the interfaces and assumptions that determine whether hardware becomes capability.
Pi Zero 3 W and Pi 4A: What the Kernel Code Actually Confirms
Pi Zero 3 W and Pi 4A appear in Raspberry Pi’s kernel source. Here is what device trees confirm and which buying and integration claims remain unverified.
More analysis
Why GNSS Can Fail During Geomagnetic Storms
Understand what geomagnetic activity can tell a drone operator—and why receiver evidence matters more than a universal Kp limit.
Did AI break PHP? What PHP2Shell actually revealed
What PHP2Shell really revealed: AI-assisted research, two serious memory flaws, the patch timeline and practical checks for website owners.
Line of Sight vs Radio Horizon
A visible drone can still have a poor radio link. Separate optical sight, radio horizon and Fresnel clearance, with worked examples and existing THL calculators.
LiPo vs Li-Ion for Long-Endurance Drones
Compare drone battery packs by usable energy, current limits, voltage sag and installed mass. Understand LiPo terminology and estimate endurance with clear assumptions.
Amazon drone deliveries in Bloomfield Hills: inside the MK30
Local reporting describes Amazon drone deliveries to eligible addresses in Bloomfield Hills and Bloomfield Township from Pontiac. This article examines the MK30 engineering behind those flights, from payload…
UK Drone Conspicuity: Do Operators Have Enough Hardware Choice?
UK drone conspicuity hardware compared: ping978EC, emerging alternatives, integration costs and the evidence operators need before choosing a supplier.
Why Counter-UAS Systems Fail at the Interfaces
Counter-UAS is not a collection of sensors, effectors and screens. It is a chain of decisions whose reliability is determined by the interfaces between them.
The Wage of War: Promoting Major Innovation
An analysis of defence innovation, investment and capability development, using Major Innovation to examine experimentation, testing and integration.
Selection Under Fire: How Conflict Filters Unmanned Airpower
An analysis of unmanned airpower under conflict pressure, focusing on navigation resilience, communications, integration and the pace of adaptation.
Tactical Necessity and the Ubiquity of Unmanned Systems
An analysis of how the war in Ukraine has embedded unmanned systems in surveillance, strike, logistics and electronic warfare, and what that implies.
Calculate first. Check the assumptions.
Use individual calculators or apply selected checks to a saved UAS profile.
Electric UAS Flight Endurance
Estimate usable flight time from mass, battery and power assumptions.
Battery Pack Builder
Compare cell configuration, usable energy, capacity and reserve.
RF Link Budget
Check power, antenna gain, path loss and required link margin.
Understand the physics before trusting the result.
Follow 22 reviewed lessons from service definition and path geometry through equipment, commissioning and maintenance.
Averfold
Protect files locally, open authenticated protected records, and verify integrity without restoring plaintext. See the concept and workflow before installing.
Follow the engineering decisions
Configuration, tests, failures, changes and next gates remain traceable.
ADS-B Feeder Kit MVP
Pre-beta build and validation programme for an Ethernet-first Raspberry Pi ADS-B feeder kit.
Multi-Sensor UAS Detection Testbed
A staged receive-only build exploring SDR-based RF observation, acoustic cueing, visual confirmation and evidence-led sensor fusion.
Evidence before certainty
Bring a technical problem worth examining
Send an article proposal, collaboration enquiry or calculator suggestion.