Breguet Range Equation Calculator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t5-055

Effect

Computation or source lookup only

Input and validation requirements

The raw formulas produce an undefined result when c=0, so validation must reject that input. Additionally, an unspecified speed unit can change the computed range from 1673.5766349 to 860.9614583 for the same numerical speed value.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "aircraft_type": "jet",
    "cruise_speed": 250,
    "cruise_speed_unit": "m/s",
    "specific_fuel_consumption": 0.00025,
    "specific_fuel_consumption_unit": "1/s",
    "lift_to_drag_ratio": 17,
    "initial_weight": 240000,
    "final_weight": 180000,
    "weight_unit": "N"
  },
  "expected_outputs": {
    "range": 4890595.23,
    "range_unit": "m"
  },
  "working": "W1/W2 = 240000/180000 = 4/3. ln(W1/W2) = ln(4/3) = 0.28768207245. V/c = 250/0.00025 = 1,000,000 m. L/D × V/c = 17 × 1,000,000 = 17,000,000 m. R = 17,000,000 × 0.28768207245 = 4,890,595.23 m."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche5/tranche5-results.json