Hydro Puls Direct Drive (HPDD)

Technical Dossier: Aviation

The revolutionary propulsion architecture transforming aviation toward thermodynamic perfection — zero contrails, >80% efficiency, and modular redundancy that makes engine failure virtually impossible.

Design Freeze / Prototype Phase 1Status: 2026

The Core Engine: Hydro Puls Principle

The HPDD replaces all rotating, friction-prone components with a fluid-elastic system built around three integrated cycles.

Primary Cycle — Combustion

Direct injection of HVO100, Hydrogen, or SAF into a hermetically sealed Inconel 718 bellows. Explosive expansion drives linear pulse motion — zero mechanical friction, 100% gas containment.

Secondary Cycle — ORC Heat Harvest

Siloxane (D5) jacket absorbs waste heat, reducing ΔT from 800°C to 230°C. Resulting vapor drives a micro-turbine, generating electrical power for onboard systems.

Tertiary Cycle — Hydraulic Output

Bellows pulse displaces synthetic fire-resistant ester through ceramic high-speed valves into a nitrogen accumulator at 350 bar nominal (roadmap: 1,000 bar).

Total system efficiency: >80% — combining direct hydraulic work, ORC turbine output, and exhaust heat pump recovery. Simulated operational lifespan: 20,000 hours maintenance-free.

HPDD v26 TRT: Modular Containerized Power Swarms

The HPDD's highest operational flexibility comes from integration into standardized LD3 (AKE) air cargo containers — transforming propulsion from a static installation into a dynamic, interchangeable energy ecosystem.

1.64 MW

Per LD3 Container

At 100 Hz current operating frequency

3.28 MW

Roadmap Output

At 200 Hz per container unit

11.4 MW

A320 Total Power

7 LD3 positions at current 100 Hz standard

15 min

Swap Time

Full container exchange by two personnel, no specialized tools

Operational & Strategic Advantages of Modular Architecture

Plug-and-Play Maintenance

A faulty container is swapped in under 15 minutes — no engine overhauls, no specialized tools, drastically reduced aircraft downtime.

Extreme Redundancy — 99.999% Safety

Power distributed across dozens of independent modules. Losing one unit means only a 2% power loss vs. 50% with a traditional twin-engine failure.

AOG Elimination

"Aircraft on Ground" situations due to engine failure are virtually eliminated. Modular redundancy keeps the aircraft operational even during individual module servicing.

Pay-Per-Hour Financial Model

Airlines carry no engine inventory risk. The HPDD supplier guarantees uptime based on the 20,000-hour lifespan — CAPEX becomes predictable OPEX.

Airbus A320 Integration: Centralized Fuselage Power

Architecture Redesign

50 modular HPDD units are integrated into the fuselage. High-pressure hydraulic power is transmitted via a siloxane network to oil plunger motors driving wing-mounted propellers and landing gear.

Eliminating massive engine nacelles (e.g., LEAP-1A) and pylons reduces aerodynamic drag by 15–18% — the "Clean Wing" design.

Weight Cascade

  • Turbofans, nacelles, pylons: −8,700 kg
  • APU and heavy electrical subsystems: −1,500 kg
  • Water tanks (replaced by exhaust harvesting): −160 kg
  • 106 units + 20 accumulators: +6,200 kg

~4.1T

Net Weight Saved

The A321 is approximately 4,160 kg lighter than a conventional aircraft — excluding additional fuel weight savings from higher efficiency.

For the A380, removing four turbines and pylons saves up to 40 tons, enabling the most competitive ticket prices in the market.

Operational Innovations: Beyond Conventional Flight

Hydraulic Wheel Drive (HWD)

In-wheel oil plunger motors enable silent, autonomous taxiing without propellers. During takeoff, instant torque shortens runway requirements. During landing, energy is regenerated into accumulators — saving brakes and enabling immediate-takeoff readiness.

Zero-Fuel Descent

During the ~25-minute descent, 50 units are deactivated. Propellers windmill as turbines, recharging hydraulic accumulators via regenerative braking — consuming zero fuel on descent.

In-Flight Water Harvesting

The heat pump cools exhaust gases below the dew point, producing approximately 1.2 liters of potable water per kg of fuel. The required onboard water tank shrinks to a mere 40-liter buffer.

Waste Heat Utilization

Wing de-icing and cabin heating are powered entirely by waste heat from return-line oil — eliminating dedicated heating systems and their associated weight and complexity.

Zero-Contrail & Emission-Free: "Ghost Exhaust"

The HPDD v26 TRT eliminates contrails through five integrated physical mechanisms — transforming propulsion from a "combustion-exhaust" cycle into a "combustion-processing" cycle.

1

Active Water Harvesting

Vapor condensed on-board via the 230°C thermal circuit — dry exhaust eliminates ice crystal formation.

2

Integrated Scrubber

Zero particulates and soot — nucleation sites eliminated, exhaust stream "invisible" to atmospheric contrail triggers.

3

Reduced Air Intake

High-pressure 600-bar cycle processes far less ambient air — minimizing moisture agitation and thermal shock.

FAQ: Key Questions Answered

Weight Penalty of Electric Flight?

Batteries are too heavy for long-distance flight. The HPDD offers the power-to-weight ratio required for aviation while using high-energy-density fuels like Liquid Hydrogen or Ammonia — zero-emission flight with payload and range that batteries cannot match.

Fuel Flexibility?

The HPDD is fuel-agnostic. While optimized for Hydrogen and Ammonia, it runs on any sustainable liquid fuel — a versatile bridge for airlines transitioning from carbon-based fuels to a fully emission-free future.

Maintenance Requirements?

Designed for a 20,000+ hour maintenance-free lifespan — a quantum leap over traditional piston engines (2,000h TBO) and turboprops. Faulty units are swapped during a 30-minute gate stop.

Distributed Propulsion?

The HPDD acts as a "Core Power Processor," converting fuel into high-pressure hydraulic energy driving ultra-lightweight motors. Propellers can be placed anywhere on the wing to optimize lift and efficiency — no heavy mechanical driveshafts required.

Dynamic Mission Scaling & Economic Model

Dynamic Mission Scaling (DMS)

Unlike traditional aircraft where maximum power is fixed by two turbines, HPDD's modular nature allows airlines to adapt power capacity to specific mission profiles.

  • Short regional flights: Minimum containers loaded to save weight
  • Transcontinental: Full cargo hold utilized for maximum redundancy and range
  • Standardization: Modules compatible across aircraft types — regional jets to wide-body cargo

Financial Transformation

CAPEX → OPEX: The massive upfront capital expenditure of traditional turbines is replaced by a predictable Pay-per-Hour operational cost model.

  • Risk transfers to the HPDD supplier
  • No airline investment in spare engine inventory
  • A380 retrofit: up to 40 tons saved — potential to halve ticket prices while maintaining healthy margins
  • AOG situations statistically near-impossible: 99.999% system redundancy

The Open Ecosystem: Android Model for Aerospace



Accelerated Innovation

Sharing blueprints for Boundary Layer Ingestion (BLI) and hydraulic power distribution allows OEMs and startups to skip years of R&D and focus on airframe optimization.

HPDD Core as a Standard

Just as Android powers diverse hardware, our patented 600-bar HPDD modules serve as the universal high-pressure heart for a new generation of hydrogen-electric aircraft.

Global Scalability

From urban air mobility (UAM) to regional freight — the HPDD core adapts to any mission. We provide the propulsion technology; you provide the application.

Design freely. Fly efficiently. Powered by HPDD.
Contact: [email protected]