NPI, DFM/DFA & Engineering Change worked example

Launch Ramp Rate at 65% expected ramp-phase line efficiency: a worked example

This worked example runs the launch ramp rate numbers for a tougher week than the baseline: 65% expected ramp-phase line efficiency instead of the typical 90%. Estimate launch ramp rate for npi, dfm/dfa and engineering change using production-ready inputs so teams can measure output per hour and compare it with the required production pace.

The inputs for this scenario

  • Units built during the launch ramp window: 1,200 units (held at the documented default)
  • Ramp window runtime: 8 hr (held at the documented default)
  • Expected ramp-phase line efficiency: 65 % (the input this scenario stresses; the baseline uses 90)

Working through the calculation

  • The calculation starts from the formula this tool documents: Launch ramp rate throughput = launch ramp rate output quantity รท launch ramp rate runtime.
  • Effective launch ramp rate throughput works out to 97.5 units/hr at these inputs, and this is the headline figure for the scenario.
  • Raw throughput works out to 150 units/hr at these inputs.
  • Expected launch ramp rate efficiency works out to 65 % at these inputs.
  • Launch ramp rate runtime works out to 8 hr at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where expected ramp-phase line efficiency sits at 90% and the headline result is 135 units/hr, this scenario comes in 27.78% below the baseline at 97.5 units/hr.
  • Use it during the ramp phase to set hourly targets and to compare actual output against an efficiency-realistic plan. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Effective launch ramp rate throughput: 97.5 units/hr (headline result)
  • Raw throughput: 150 units/hr
  • Expected launch ramp rate efficiency: 65 %
  • Launch ramp rate runtime: 8 hr

Run it with your numbers

  • To rerun this with your own numbers, open the live Launch Ramp Rate calculator, set expected ramp-phase line efficiency to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.