Lift Coefficient / Lift Force 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

t5-033

Effect

Computation or source lookup only

Input and validation requirements

Required-Cl calculations divide by zero when V=0 or S=0 and must reject the input rather than emit a numeric result. The specification also provides no genuine formula branch, so signed negative velocity handling and the sign convention for lift and Cl remain ambiguous.

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": {
    "Cl": 0.5,
    "S_m2": 16,
    "V_mps": 50,
    "rho_kg_m3": 1.225,
    "weight_N": 12000
  },
  "expected_outputs": {
    "lift_N": 12250,
    "required_Cl": 0.4897959184
  },
  "working": "Dynamic pressure q = ½ρV² = ½ × 1.225 × 50² = 0.6125 × 2500 = 1531.25 Pa. Lift L = q × Cl × S = 1531.25 × 0.5 × 16 = 1531.25 × 8 = 12250 N. Required Cl = W/(qS) = 12000/(1531.25 × 16) = 12000/24500 = 0.4897959184."
}

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