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break-up: magic  ~ 42 nmi
@100kft - no more heating
@50kft - free fall (straight down) & wind

[[left margin]]
80km
80,000 m
[250,000 ft]
[[/left margin]]

10-40% of re-entry material [[?]]

break-up: early shedding ~ 250kft
ET ~ 220K ± 20kft
standard (w/ dramatic event)
large aerodynamic deccl loads
shuttle= early shedding 230k
            break-up ≈ 200k
SSTO relevance (!)