Marine, Shipbuilding & Boat Manufacturing worked example

Propulsion System Install Time at 29% alignment, testing, and correction allowance: a worked example

Push alignment, testing, and correction allowance up to 29% and the picture changes. This example computes every intermediate figure at that operating point. Use it when scheduling propulsion installation in the build sequence to allocate crew time and coordinate with hull, mechanical, and electrical trades.

The inputs for this scenario

  • Number of engines: 2 engines (unchanged)
  • Base install hours per engine: 40 hr / engine (unchanged)
  • Drive type complexity factor: 1.5 x (unchanged)
  • Alignment, testing, and correction allowance: 29 % (raised for this scenario; the documented default is 25)

Working through the calculation

  • Applying the documented formula (Base propulsion install hours = engines x base install hours x drive type complexity factor) to the inputs above produces each figure below.
  • At this operating point the engine returns 0.05 hr for total propulsion install labor hours, the number this scenario is built around.
  • At this operating point the engine returns 0.05 hr for base propulsion install hours.
  • At this operating point the engine returns 1.5 % for alignment and testing hours.
  • At this operating point the engine returns 40 pieces / min for install rate per engine.

How this compares with the baseline

  • Against the tool's baseline example, where alignment, testing, and correction allowance sits at 25% and the headline result is 0.05 hr, this scenario lands almost exactly on the baseline at 0.05 hr.
  • It estimates total propulsion install labor hours by scaling base hours per engine for drive-type complexity and adding an allowance for alignment, testing, and correction. 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

  • Total propulsion install labor hours: 0.05 hr (headline result)
  • Base propulsion install hours: 0.05 hr
  • Alignment and testing hours: 1.5 %
  • Install rate per engine: 40 pieces / min

Run it with your numbers

  • Every input above is editable in the live Propulsion System Install Time calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.