# Helical-Manifold Film-Cooled Methalox Nozzle (v1.0.0)
DOI: 10.5281/zenodo.14681337
Parametric exploration + full epistemic uncertainty quantification of a reusable 30 MPa methalox nozzle using only passive 14–22 % methane film cooling delivered through large helical manifolds.
## Key results (95 % credible interval, plasma OFF)
- Vacuum Isp: 377.4 – 385.9 s
- Throat recession (GRCop-42): 42 – 112 µm/s
- Sweet spot: ~17 % bleed → ~383 ± 4 s with >200-flight life
## Files
- helical\_film\_nozzle\_v1.pdf – full 12-page write-up with derivations
- model\_epistemic\_honest.py – runnable uncertainty-aware model
- provisional\_claims.txt – USPTO-ready provisional claims
License: CC-BY-4.0
Author: @Benthic_Shadow
December 2025