PNC-50-4, current 072703 — Revision B — ESTIMATED
Source identity: CURRENT_072703

This free pack preserves the original STL and STEP geometry from the expanded
Estes Nose Cone Library B. All geometry is in millimeters.

Base diameter: 24.79 mm
Exposed height including features: 104.78 mm (excludes shoulder)
Shoulder: 24.13 mm diameter x 19.05 mm long
Overall X x Y x Z: 24.79 x 24.79 x 123.83 mm
Evidence confidence: low. This is not a numerical tolerance.

These models use educated estimates, including inferred dimensions and shapes.
They are solid exterior references for CAD editing, not verified replicas or
finished hollow flight parts. No printer clearance, original hollow interiors,
electronics or recovery hardware are included. Solid CAD does not prescribe
100% slicer infill. Digital geometry checks do not validate physical fit, mass,
strength or flight suitability. Check actual tubes and print fit yourself.

Why this shape was chosen:
The slender photographed nose is about four to five base diameters long. Interpret the unqualified official 4.125 in as exposed length, using the closely related historic PNC-50YR size as a dimensional anchor. A 19.05 mm shoulder is borrowed from that family. The alternative overall-length interpretation remains possible; this assumption is explicitly an estimate.

Estimated fields:
- exposed_length_mm
- profile_stations
- shoulder_diameter_mm
- shoulder_length_mm
- feature_dimensions

See MODEL_RECORD.json for the complete original source record and evidence.
Sources:
https://estesrockets.com/products/pnc-50-4-nose-cone

The retained Apache 2.0 license applies to the OpenRocket source database
where used. It is not a new license for this entire model library.
Independent recreations; no Estes affiliation or manufacturer verification.

Full library, CAD source and original notes:
https://iterarocketry.com/nose-cones
Support: info@iterarocketry.com
