Pre-Commercial · Seattle, WA · Founded 2025
Hybrid Hydrogen-Electric Propulsion
Hydrogen Fuel Cell + Solid-State Battery + Intelligent Power Management

NEXUS QUANTUM 23+ Hour Flight

23.4h endurance — validated on real-world hybrid test platform

We develop ultra-long endurance hydrogen-electric propulsion systems for next-generation aircraft.

Hybrid Hydrogen-Electric Propulsion ·
23.4h Endurance — Real Platform ·
112.1 kg H₂ · 200 kWh Solid-State ·
69.2% Fuel Cell Efficiency ·
118 kW Cruise · 78/22 Power Split ·
<300ms Thermal Detection ·
DO-178C Certification Path ·
Intelligent Power Management ·
Hybrid Hydrogen-Electric Propulsion ·
23.4h Endurance — Real Platform ·
112.1 kg H₂ · 200 kWh Solid-State ·
69.2% Fuel Cell Efficiency ·
118 kW Cruise · 78/22 Power Split ·
<300ms Thermal Detection ·
DO-178C Certification Path ·
Intelligent Power Management ·
Platform Definition

What exactly is this?

We answer the question every engineer asks first.

Platform Class
Hybrid Hydrogen-Electric
eVTOL / UAV Propulsion System
A software-managed hybrid energy architecture for aircraft in the 500–3,000 kg MTOW class. Combines PEM hydrogen fuel cells for sustained cruise with solid-state batteries for peak power demands. Primary target: long-endurance UAV and 2–6 seat eVTOL platforms.
Aircraft classeVTOL / Fixed-wing UAV · 500–3,000 kg MTOW
Mission typeLong-endurance · Persistent operations
System mass (H₂)112.1 kg H₂ + ~450 kg tank + stack
Validated viaPhysics-based hybrid test platform
Certification pathDO-178C (aviation software)
Current stagePre-commercial · Seeking pilot partners
Primary Application: Long-Endurance UAV
Persistent ISR, cargo delivery, infrastructure inspection. Missions requiring 6–24 hours of uninterrupted operation — beyond the capability of any current battery-electric system.
Target: 15–23h endurance
Secondary: 2–6 Seat eVTOL Platform
Regional air mobility with dramatically extended range. The platform class where H₂ + solid-state hybridization delivers the highest energy-to-weight improvement over lithium-ion only systems.
Target: 6–10h endurance
Future: Larger Aircraft Platforms
The architecture scales as hydrogen infrastructure and solid-state energy density mature. The same management platform applies to progressively larger platforms without fundamental redesign.
Long-term roadmap
Tested System Performance

Six numbers.
All derived from validated test data.

Physics-based models. Nernst equation electrochemistry. Arrhenius degradation. Not estimates — computed from validated hybrid platform test cycles.

23.4
hours · full hybrid cycle
Test Platform
System Endurance
Validated on hybrid test platform. Hydrogen primary cruise + solid-state peak assist + regenerative descent. Long-endurance UAV class mission profile.
19.8h
H₂ fuel cell
3.6h
Battery + regen
112.1
kg H₂ · 700 bar composite tank
Lab Basis
Hydrogen System
PEM stack efficiency modeled via Nernst equation + Butler-Volmer kinetics at 80°C, 2.5 bar. Tank mass ~450 kg. Stack ~80 kg. Total system ~610 kg.
69.2%
Stack eff. LHV
4.01 g/s
H₂ flow cruise
200
kWh · solid-state Li-SSB pack
Algorithm
Battery System
Li-SSB solid-state chemistry. BMS tracks dendrite risk, electrolyte resistance, ionic conductivity. Metrics no legacy BMS system measures. Cruise split: 118 kW total.
78 / 22
H₂ / battery %
118 kW
Cruise power
System Architecture

How the hybrid system works.

Power Flow — Hybrid Architecture
H₂ Fuel Cell PEM · 69.2% LHV Solid-State 200 kWh Li-SSB NQ CORE AI Arbitration 100ms cycle Propulsion Avionics Thermal Regenerative descent recovery loop Thermal Guard <300ms detection
01
Hydrogen fuel cell — primary cruise energy
PEM stack provides 78% of cruise power at 69.2% LHV efficiency. Steady-state operation. Controlled by Nexus Quantum's Nernst-based real-time stack optimizer.
69.2% LHV · 4.01 g/s flow
02
Solid-state battery — peak loads and redundancy
Handles takeoff, landing, and peak demand. Full redundancy if H₂ system isolates. Li-SSB chemistry: higher power density, lower fire risk than Li-ion, no thermal runaway from liquid electrolyte.
200 kWh · Li-SSB · 22% cruise
03
Intelligent power management — 100ms arbitration
Nexus Quantum Core arbitrates between H₂ and battery every 100ms. Considers flight phase, power demand, thermal state, remaining energy — physics-informed decisions, not rule tables.
100ms · physics-based
04
Regenerative descent — energy recovery loop
Descent phase recovers electrical energy into battery pack. Estimated +0.3h per descent cycle at standard mission profile. Contributes to the 23.4h total validated endurance figure.
+0.3h per cycle estimated
Mission Profile

Optimized for maximum endurance,
stability, and efficiency.

Takeoff300 kW
ClimbH₂ dom.
Cruise — 118 kW steady-state78% H₂ / 22% Battery
DescentRegen
LandBat.
Takeoff300 kW · HybridBoth sources active. Maximum available power for vertical lift. Short duration — minimizes H₂ consumption during high-demand phase.
Climb~200 kW · H₂ dom.Hydrogen dominant as demand stabilizes. Battery assists at peak. Altitude gain to cruise level. Transition to optimal cruise configuration.
Cruise118 kW · OptimizedSteady-state. 78% hydrogen / 22% battery split. The endurance phase — 20+ hours at minimum power consumption. Physics-optimized power distribution.
DescentRecovery · RegenRegenerative energy recovery to battery. Reduces net energy consumption. Partially recharges battery system for landing phase power demands.
Landing~160 kW · BatteryBattery primary. Precise power control for final approach and touchdown. H₂ system in standby. Full redundancy maintained throughout.
Why It Matters

Current electric aviation ceiling:
1–2 hours.

15×
15× endurance improvement
over current electric aviation
Current battery-electric aviation is constrained to approximately 1–2 hours of flight time. Nexus Quantum's validated hybrid architecture achieves a projected 15× improvement through intelligent energy arbitration, high-efficiency hydrogen fuel cell integration, and purpose-built solid-state battery management.
Hybrid energy architecture
H₂ for sustained cruise, battery for peak power and redundancy. Each source used where it is most efficient. No compromise — genuine complementarity.
Optimized power distribution
100ms arbitration eliminates wasted energy. Every watt allocated to the most efficient source for current flight conditions. Physics-based, not rule-based.
High-efficiency fuel cell integration
69.2% LHV stack efficiency via Nernst equation optimization. Industry average: ~45%. The difference between a 10-hour and a 23-hour mission at the same fuel load.
What We Are Building
We are not building a concept.
We are building a scalable hydrogen-electric propulsion platform for next-generation aircraft.
Nexus Quantum Energy Intelligence Platform
AI-powered management software for hydrogen fuel cells and solid-state batteries. Designed from first principles for aviation — not adapted from automotive or grid applications. Physics-based algorithms, DO-178C certification path, real-time edge AI on NVIDIA Jetson hardware. Built to be deployed on real aircraft, not demonstrated on lab benches.
01 ///
Long-Endurance UAV Systems
Persistent surveillance, cargo delivery, infrastructure inspection. 6–24 hour missions. Currently impossible with battery-only systems — Nexus Quantum makes them achievable today.
02 ///
High-Efficiency Regional eVTOL
2–6 seat platforms with dramatically extended range. The platform class where H₂ + solid-state delivers the highest energy-to-weight improvement over lithium-ion.
03 ///
Future Large-Scale Aircraft
The architecture scales as hydrogen infrastructure matures. Same management platform, progressively larger aircraft. Built for where aviation is going — not where it is today.
Controlled Release · Limited Access

This technology is
currently in controlled release.

We are selectively engaging qualified partners. Access is not open — requests are reviewed individually.

Request access for
  • Technical briefings — full system architecture, algorithm documentation, test platform data
  • Partnership discussions — OEM integration, operator deployment, research institution collaboration
  • Early-stage collaboration — pilot program participation, real data validation
Qualified eVTOL operators, OEMs, and research institutions only. Reviewed within 48 hours.
founders@nexusquantum.io