WHERE INTERIOR VOLUME IS LOST
Volume that should be available to the payload is routinely consumed by the enclosure itself:
- Thick walls and double-wall construction
- Mold draft angles and rounded internal corners
- Oversized lid and door structures
- Internal hardware projections
- Excess foam or poorly planned shock isolation
- Standard case dimensions that don't match the payload
DESIGNING THE PACKOUT AS A SYSTEM
The enclosure, payload, rack or foam structure, cable paths, ventilation, lifting hardware, service access, and maintenance requirements should be developed together. Optimizing only the outside case, or only the interior cushion, can create conflicts later in the program.
THE LMTV CARGO-BED COMPARISON
A real-world example: within an identical 150" × 90" × ~60" usable LMTV cargo bed, 18 large molded-plastic cases deliver 210 ft³ of total usable volume at ~79.2 lb empty weight each. 21 ZARGES 40580 aluminum cases fit the same envelope and deliver 307 ft³ of total usable volume — approx. 97 ft³, or 46%, more usable equipment volume — at ~44.1 lb empty weight each, approx. 500 lb less total empty packaging weight across the load, even while carrying three additional cases.
BEYOND ONE TRUCK: THE CONVOY-SCALE EFFECT
Equipment is rarely deployed as a single enclosure — it's moved in quantity, often across multiple vehicles and repeated transport cycles. A case-level improvement scales with fleet size: across 10 similarly loaded LMTVs, the same ratio represents approx. 970 additional cubic feet of usable volume and approx. 5,000 lb less empty packaging weight. Across 50 vehicles, that grows to approx. 4,850 ft³ and 25,000 lb — 12.5 tons — of packaging weight eliminated.
The "P" in SWEPT measures how much mission capability — not merely empty volume — fits within the available envelope.
ENGINEERING PRINCIPLE SUMMARY
- Optimize the enclosure and payload as one integrated system.
- Usable volume is more meaningful than nominal case size.
- Reserve space intentionally for cables, cooling, service access, and growth.
- Compare payload efficiency using measured, functionally equivalent configurations.
