Fast-Fill Cylinder Programme — Refuel a Drone in 90 Seconds
Refuel a hydrogen drone in 90 seconds. Without cooking the cylinder.
Hydrogen drone fleets are growing fast. The bottleneck on the airfield is the same every time: standard 350-bar field refills take 5–15 minutes, the cylinder liner reaches 60–80 °C even at 25 °C ambient, and operators can’t push faster without crossing the SAE J2601 85 °C safety limit.
The MEYER Fast-Fill Cylinder Programme demonstrates that MEYER cylinders can be quick-filled safely. We have run sub-90-second 0→300 bar fill tests where liner temperatures stayed below the critical thermal limits for the polymer and bond-line, so the cylinders themselves are safe under fast-fill conditions. The programme then offers engineering paths to actively suppress the heat-of-compression rise itself when an application calls for additional thermal margin — through finned aluminium boss heat sinks, phase-change-material interstitial layers between liner and CFRP overwrap, and refuelling protocols matched to the cylinder’s actual thermal mass rather than the SAE J2601 generic default.
Why this matters: a 90-second refill changes the unit economics of hydrogen drone fleets. Sortie turnaround drops from “swap the cylinder” (1 spare per airframe, logistics overhead) to “fill the cylinder” (no swap, no spare inventory). Operations that can’t justify hydrogen at 10-minute fill times start working at 90 — and our test data shows the cylinders run safely at that fill rate.
The architecture — design paths for additional thermal margin
For programmes that want a wider thermal margin than what a stock cylinder + standard fill protocol already delivers, the Fast-Fill Programme offers four engineering paths. Any of them can be applied individually, or combined for the most demanding fast-fill envelopes.
- Integrated finned aluminium boss heat sink — replaces the standard machined boss with a 6061-T6 boss that has external cooling fins. Acts as a thermal short between the in-cylinder gas and the surrounding ambient air during fill.
- Phase-change-material (PCM) interstitial layer — a 1–2 mm layer of paraffin-PCM (or proprietary inorganic blend) between the PET liner and the CFRP overwrap. Absorbs heat-of-compression isothermally during the fill and releases it slowly back to ambient over the next 10–15 minutes.
- Co-designed refuelling receptacle — a thermal-quick-connect that meters the fill ramp based on real-time in-cylinder temperature feedback, not just inlet pressure. Adapts to ambient — 30 s in cold weather, 90 s in 40 °C summer.
- Refuelling protocol — calibrated specifically to the cylinder’s thermal mass, replacing the SAE J2601 generic light-duty-vehicle protocol that doesn’t apply to sub-49 L vessels anyway.
Status
The Fast-Fill programme is at the prototype-design stage. PCM materials selection and cycle-life testing are running in 2026. Receptacle co-development is in scoping. First flight-test articles targeted for 2027.
What we’re looking for in design partners
UAV airframe integrators
Hydrogen drone OEMs in the 5–25 kg gross-weight class who can flight-test a Fast-Fill prototype on a working airframe. Partner gets early-access spec, co-development pricing, and named recognition in the qualification dossier.
Field refuelling station operators
Companies building drone-grade refuelling stations (cartridge-swap, mobile electrolyser, or compressed delivery). We’re looking to co-validate the receptacle-side protocol against real-world fill ramps.
Emergency-response & survey operators
Wildfire-monitoring, search-and-rescue, infrastructure-inspection and rapid-survey drone operators where ground time between sorties directly costs information, money or lives. Sub-30-minute mission turnaround across long shifts shifts the operational case for hydrogen significantly.
What you get if you join
- Early access to prototype articles for flight test
- Named recognition as a co-development partner in the qualification dossier
- Co-development pricing on first production lot
- Influence over the receptacle-side protocol and connector geometry
- Dedicated MEYER engineering support during integration
