governs the human habitat only — the shield is sized from the cargo shadow below
Engine core — candle arms
Arm pin radiusm
where the three arms pin to the shield's aft face, measured from the spine axis
Arm slenderness×pin
candle length = pin radius × slenderness — ICMRC's own default ratio
Burn cycles
time-based demo cycle, independent of any mission timeline — full length down to minimum, then reset
Shot cadenceHz
a fixed rendering cadence — never tied to the arms' angle or theta, so it cannot speed up as they converge
Mass per shotkg
at the calculator's mass flow, held constant below — so a constant shot cadence is the correct way to show it
Flash intensity250%
stylises the glow only — apex light and flash sprite brightness; the burn geometry underneath is untouched
Habitat — four tethered container modules, in a cross
Berthscrew
Assumed nausea ceilingrpm
2 rpm is the standard human figure; raised here for this crew
Module height (ceiling)m
the container's own height — floor to ceiling
Spin raterpm
g at the floorg
Cargo — shipping containers
Container type
Mast side lengthm
fixed to one container's own cross-section edge
Beam tube radiusm
runs the full mast length, through the shield's own bore, out to the habitat's bearing
Heavy — tiers / bays
tiers
bays
Bulk — tiers / bays
tiers
bays
Precision — tiers / bays
tiers
bays
Ring k is a complete square outline around the mast, 8k cells. Tiers = N includes every ring from 1 to N, nested: N=1 → 8, N=2 → 24, N=3 → 48. Bays repeats the whole nested structure end to end along the mast.
Mass
Module densitykg/m³
1000 kg/m³ is water
Mast, funnel and shieldt
flat allowance
View
Extract
Enginerate
Inspectburn statefreshdeconverge0%
Drag "burn state" to jump straight to any point in the burn (it freezes automatically). "Deconverge" temporarily reduces the arms' inward tilt so all three spread apart and each wedge's own taper is visible on its own, without the others crowding it — 100% points them straight back, parallel to the mast, not converging at all.
YOUR value — the tool derives burnup from it. The button inverts against the best ablator loading.
LiD fraction of ablator φ%
fraction of the ablator that is ⁶LiD; K is solved to match ve
Compressed ρRg/cm²
Fusion burnup%
Effective fusion yieldJ/kg
Design — mechanisms, each switchable
Foil areal densitymg/cm²
Range in fuelmg/cm²
a fragment cannot outrun its own range; thicker foil fissions more and exhausts slower
Redirection ε%
aft fraction ξ = ½(1+ε) of whatever escaped the foil
Ablator enthalpy hGJ/kg
paid before any of the deposit becomes jet kinetic energy
Range in ablatormg/cm²
with the range in fuel, sets the least ablator that can stop the inbound half
How η is chosen
Marshak coupling η%
P_abl = η·P_dep; the remainder (1−η) has nowhere to go but the radiator
How the radiator is sized
Radiator allowance%
of dry mass — the radiator is deducted from the dry mass, not added to it
Film thickness τµm
self-radiating film: the radiator IS the structure, no pumps, no working fluid
Film density ρkg/m³
Film temperatureK
Emissivity ε_r
κ = ρτ / (2·ε_r·σ·T⁴)
Radiator sized by
Radiator κkg/MW
Design — other channels
Decay heat to matrix%
of retained decay heat absorbed by the ablator
Decay heat to hull%
of retained decay heat reaching the structure — goes to the radiator
Design — what it takes
—
Fragments clearing foil%
Exhaust ve achieved%c
Solved η%
Ablator : fuel K
φ used%
Least K for φ ≤ 100%
Fuel loadedt
Ablator loadedt
Ablator jet speed%c
Fission power releasedW
Deposited on the blockW
Carried off by ablatorW
Radiator loadW
Radiator masst
Radiator aream²
Ledger residual
Where the released energy goes
—
Only the nine final fates partition the released power; they sum to 100% exactly. The first group splits that same power by origin, and the middle group is heat routed onto the block on its way to a final fate — both are views of energy counted once below, not extra energy. The residual re-forms the jet terms independently: the sublimation term from mass × enthalpy, and the jet kinetic term by taking the jet speed back through γ, so an error in the enthalpy split shows up instead of cancelling.