16 Subsystems.
70 Years of Iteration.
Each traced from first-generation failures through to current state and recommended next steps
Gloves & Dexterity
Most persistent mission-limiting subsystem across all three programs. 12 development lines documented. Torque vs thermal paradox at finger-joint level remains unsolved.
Helmets & Visors
Visibility, thermal load, comms, dust contamination and maintainability. Helmet penetrations in dusty lunar environments proved consistently problematic across Apollo and concept studies.
Life Support / LSS
Vehicle-fed IVA vs umbilical EVA vs autonomous backpack. EVA-23 water intrusion (2013) proved contamination sensitivity is life-critical. Water loop management now rated P1 priority.
Torso & Entry Systems
Front vs rear-entry architecture. Soviets pioneered rear-entry from KRECHET (1967) through Orlan. US adopted modular HUT from Shuttle EMU. Rear-entry enables solo donning — critical for planetary surface ops.
Mobility Joints
Link-net restraint (IVA ideal, EVA insufficient) to hard-bearing modular joints. Soviet and US programs independently converged on convolute→hard-bearing progression. Partial-gravity mobility remains under-characterised.
Thermal & Materials
LCG became mandatory post-Apollo as EVA duration increased. Dust, cold shadow, and hot-sun regimes simultaneously present at lunar south pole. Modular outer layers and self-cleaning concepts needed.