Realizing High-Test Peroxide (HTP) in Aerospace

For over a year, I have proposed various VTOL aircraft and space rocket architectures utilizing optimized onboard propellant combinations. While Liquid Oxygen (LOX) is standard for low-frequency space launches, its cryogenic boil-off makes it entirely unviable for aviation platforms requiring extended operational readiness and hours of standby. The pursuit of a unified propellant across both domains requires an alternative oxidizer: High-Test Peroxide (H₂O₂). However, implementation demands specific mechanical architectures and tailored purity tiers to balance performance against handling logistics.

Implementing HTP requires solving strict physical design constraints:

Fluid Path and Feed Lines: The path from the storage tanks to the catalyst pack must be minimal with negligible valving. The "Naked Rocket" design resolves this by directly feeding the engines located under each structural support stud.

Turbopump Dynamics: HTP turbopumps require precise pressure management to avoid rapid decomposition. This is solved by using a cascaded configuration of smaller radial pumps to lift the pressure smoothly, combined with a reduction of the chamber pressure to 45 bar.

Nozzle Consolidation: The lower combustion temperature of the HTP-LPG combination enables a critical structural consolidation: replacing heavy, complex, gimbaled bell nozzles with fixed, highly efficient advanced aerospike nozzles. The reduced thermal flux protects the aerospike plug while allowing the same chemistry to drive high-efficiency Aerospike Space Vehicle Control Thrusters. Coupled with LPG, HTP forms the ideal propellant combination for mass-producible VTOL aviation and space missions.

While space missions dictate a strict requirement for 98% HTP to maximize density impulse, civil and military aviation—specifically rocket-powered, ramjet-integrated VTOL and STOL aircraft—can operate at lower purities. These atmospheric platforms leverage aerodynamic lift, air-augmentation, and afterburner effects, reducing the baseline efficiency penalty of a lower-purity oxidizer.

To optimize safety and logistics across these platforms, I propose a tiered concentration architecture:

Base-Level Storage (50% Purity): Peroxide is synthesized and stored long-term at 50% purity. At this concentration, the fluid is highly stable, significantly reducing decomposition risks during prolonged storage. Ground infrastructure utilizes passivated, cleanly maintained lining and valves, offering a far simpler and lower-cost paradigm than cryogenic LOX management.

Aviation Operational Fleet (70% Purity): For civil aviation, the onboard operational threshold is set at approximately 70% purity. This strikes an ideal balance, presenting an acceptable onboard risk profile while remaining the only viable way to store a non-cryogenic oxidizer alongside the primary fuel for hours. Military applications can scale above 70% depending on the specific mission profile.

The transition between these tiers relies on the solid-state purification technology proposed earlier. Rather than executing a high-energy synthesis from scratch at the launch site, parallelized, localized modules utilize high-frequency piezoelectric atomization and dielectrophoretic sorting to rapidly strip water from the 50% feedstock. This point-of-use concentration meets high-volume aviation demands on short notice, bypassing legacy thermal distillation hazards and ensuring safe, localized deployment for next-generation VTOL flight.