Battery-only endurance
High peak power and simple onboard electrical distribution.
What compounds
At extreme endurance and cold soak, thermal conditioning, installed mass, recharge, repeat recovery, and cell lifecycle can become system-defining.
Technology
Extreme endurance is a whole-system design problem.
Energy choice cannot be separated from heat, acoustic signature, payload, servicing, safety or cost. Andrasta designs those constraints together around the mission.
Extreme-endurance design space
Choose the architecture against the whole mission, not one energy metric.
At extreme endurance, heat, signature, handling, safety, serviceability, survivability and cost can matter as much as the energy stored onboard. Relative advantages depend on vehicle scale, duty cycle and available support.
Mid-scale liquid hydrogen
High gravimetric fuel storage.
What compounds
Cryogenic containment, insulation, conditioning, boil-off management, and specialist logistics can dominate a mid-size platform.
Ultra-high-pressure hydrogen
Avoids cryogenic fuel storage.
What compounds
Containment mass, high-pressure hardware, safety demonstration, handling and cost can become significant as endurance requirements increase.
Combustion + bulk-liquid AIP
Mature fuel logistics and established machinery.
What compounds
Noise, thermal and reaction management, maintenance and survivability require mission-specific trade-offs where low-signature persistence is a priority.
Andrasta design space
Integrated hydrogen-electric architecture
Conformal low-pressure hydride hydrogen storage, electrochemical conversion, battery peak-power buffering and shared thermal management are sized together around the vehicle and duty cycle.
No single subsystem is allowed to optimise at the expense of the whole vehicle.
Cost, manufacture, service and adversarial operation enter at concept stage.
The result is intended to scale into affordable distributed systems, not only high-cost specialist vehicles.
Optimised concurrently
EnduranceThermal balanceAcoustic signatureSurvivabilityLifecycle + recoveryServiceabilitySafety + complianceUnit cost
Hybrid duty cycle
Hydrogen carries endurance. Batteries deliver peak power.
Low-pressure hydride hydrogen storage supports persistent demand, while a temperature-managed battery system is configured for propulsion peaks, sensing and high-power payloads.
Hybrid energy architecture
Separate the endurance load from the peak-power load.
Hydride hydrogen for endurance
Conformal low-pressure hydride hydrogen storage carries persistent hotel, transit, loiter and mission demand through electrochemical conversion.
Batteries for peak power
Configured for peak propulsion, sensing and demanding appliance loads without carrying the complete endurance requirement.
Shared thermal architecture
Maintains the battery within its intended operating environment as part of the integrated power system.
Mission demand
Power demand changes through the mission.
Low → peak
Hibernate + watch
Low-power awareness between active tasks.
Transit + station-keep
Efficient continuous mission demand.
Manoeuvre + appliance burst
High-power propulsion, sensing and mission appliances.
Separating energy from peak power creates electrical headroom for demanding mission appliances that are difficult to accommodate within a compact, cost-controlled endurance vehicle.
Integrated building blocks
Capability depends on controlled interfaces.
Vehicle, energy, payload and command interfaces are developed together so new capability can be added without redesigning the whole platform.
01
Conformal hydride energy architecture
Low-pressure hydride hydrogen storage and electrochemical conversion carry persistent demand while a temperature-managed battery power domain is reserved for peak propulsion, sensing, and demanding appliance loads.
02
Low-signature propulsion
Direct-drive electric propulsion, a low moving-part count, and system-level acoustic design support quiet operation and maintainability.
03
Robotic replenishment
AndraCharge is designed to connect portable fuel and service nodes with compatible vehicles. Replenishment is intended to extend deployment within inspection, reliability and service limits; it does not replace maintenance.
04
Modular payload bays
Accessible, configurable payload volumes with defined power, data, and thermal interfaces support sensing, inspection, communications, and demanding specialist appliances.
05
Autonomy + command interfaces
Defined power, data, navigation, communications, and command interfaces allow specialist autonomy and C2 capability to integrate cleanly.
06
Design for manufacture
Additive manufacture is used where it reduces tooling, weight, part count, or iteration time; conventional fabrication remains where it is stronger.
Manufacturing strategy
Prototype quickly without designing out repeat manufacture.
Early builds are used to close physical risk quickly, while common interfaces and production methods carry the useful learning into repeatable systems.
Printed structures and tooling can shorten design loops, consolidate parts, reduce weight, and support repairable modular construction. Conventional composite and metal processes remain part of the same production system.
Prototype
Rapid iteration of vehicle geometry, controls, energy systems and payload integration.
Scale
Common modules and interfaces carried into mission-size vehicles.
Lifecycle
Designed for inspection, component replacement and refurbishment, with improvements informed by fleet experience.
Integration model
Own the platform. Integrate specialist capability where it is stronger.
Andrasta controls the physical subsea architecture and defines the interfaces used by specialist partners in autonomy, command-and-control, sensing, fabrication, testing and assurance.