Working tool · engine preview

Layout converter

Live output from Architect’s layout engine. Convert a Dual-Angle layout into its VLS equivalent, compute the 2LS Lightning Arc from a PAP, and resolve span conventions.

Dual-Angle → VLS

Cross-system conversion

No published converter exists between these systems. This one is derived from spherical geometry — the pin, PSA and PAP form a spherical triangle, and each system measures it differently.

Dual-Angle50.0° × 4.50″ × 35.0°
VLS equivalent4.50″ × 4.21″ × 2.23″
pin-to-PAP × PSA-to-PAP × pin buffer
Round-trip check✓ converts back exactly
  • pin-to-PSA assumed 6.75" (symmetric virtual mass-bias convention)
  • Ball modelled as a sphere of radius 4.294" (Storm's constant)
  • Angles are unsigned magnitudes — orientation is carried separately
2LS

Lightning Arc from the PAP

Storm publishes this as a lookup chart. Computed here instead, straight from the entered PAP.

Lightning Arc (chart value)5.000″
Exact (unquantized)5.050″
Storm’s published chart rangewithin
Verified

Checked against every cell of Storm’s published Lightning Arc chart — all 1,681 values match this formula exactly (the chart rounds to ⅛″).

Storm Lightning Arc Chart, verified 2026-08-02
Fit

Span conventions

Full span includes inserts; cut-to-cut excludes them. The difference is the insert thickness per hole — there is no universal offset.

Full span (with inserts)4.500″
Cut-to-cut (no inserts)4.375″
Conventional grip?no — inserts present

This is the engine, not the product. The full application — wall library, drill sheets, customer records — is in build.

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