NPI, DFM/DFA & Engineering Change worked example

Launch Ramp Rate at 99% expected ramp-phase line efficiency: a worked example

Push expected ramp-phase line efficiency up to 99% and the picture changes. This example computes every intermediate figure at that operating point. Use it when launch ramp rate in npi, dfm/dfa and engineering change is being committed and you need a throughput number you can defend.

The inputs for this scenario

  • Units built during the launch ramp window: 1,200 units (unchanged)
  • Ramp window runtime: 8 hr (unchanged)
  • Expected ramp-phase line efficiency: 99 % (raised for this scenario; the documented default is 90)

Working through the calculation

  • Applying the documented formula (Launch ramp rate throughput = launch ramp rate output quantity รท launch ramp rate runtime) to the inputs above produces each figure below.
  • At this operating point the engine returns 149 units/hr for effective launch ramp rate throughput, the number this scenario is built around.
  • At this operating point the engine returns 150 units/hr for raw throughput.
  • At this operating point the engine returns 99 % for expected launch ramp rate efficiency.
  • At this operating point the engine returns 8 hr for launch ramp rate runtime.

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 10% above the baseline at 149 units/hr.
  • It divides launch output by runtime to get raw throughput, then multiplies by expected efficiency to give effective throughput. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Effective launch ramp rate throughput: 149 units/hr (headline result)
  • Raw throughput: 150 units/hr
  • Expected launch ramp rate efficiency: 99 %
  • Launch ramp rate runtime: 8 hr

Run it with your numbers

  • Every input above is editable in the live Launch Ramp Rate calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.