Relay One

The model above is not an illustration. Every plate in it is extruded from the same DXF files that would go to the factory — same octagon, same bolt circles, same 52 holes in the upper deck.

The performance figures are not brochure numbers either. The hover model is momentum theory with its figure-of-merit calibrated against DJI's own published M350 data — 6.47 kg on 21-inch propellers for 55 minutes on 526 Wh. Applied to this airframe and the 1 554 Wh semi-solid pack already in the building, it returns 72 minutes of still-air hover at 12.2 kg.

Nothing here needs to be invented. The propulsion is an off-the-shelf integrated unit, the flight controller is a standard Pixhawk-class board, and the airframe is carbon plate and tube — the same construction as every agricultural drone flying today.

Already done

• ✓Full airframe specification, mass budget and power architecture
• ✓Seven A3 manufacturing drawings, general arrangement to spec sheet
• ✓Five DXF cut files, dimensioned and toleranced
• ✓Bill of materials with named suppliers and price bands
• ✓RFQ pack ready to send to five carbon shops

Still open

• 1Weigh the battery — the design assumes 4.78 kg
• 2Fix the arm hinge model, then match the deck hole patterns to it
• 3NCAA registration and operating permit, started in parallel