02/03/2026
Phase II CFD results are in ✅
We iterated our bi-lobe envelope geometry Mk1 → Mk2 → Mk3 to quantify how the center “cleavage” interface drives turbulence + parasitic drag.
Key takeaway: Mk1 is lowest drag overall, while Mk2 cleans up the center flow and is slightly best per-volume at 40 km/h in our AWS hi-res set.
Blog (full plots + numbers): https://h2use.com/2026/03/02/phase-ii-envelope-iteration-mk1-mk2-mk3-aerodynamics-focus/
Video: https://youtu.be/doJn7A2Z1fM
This video shows a continuous FluidX3D speed sweep for our Phase II airship envelope (Mk1, Mk2, Mk3 composite), using one run from 0 to 50 km/h and back to 0...
