Marine, Shipbuilding & Boat Manufacturing worked example

Propulsion System Install Time at 18% alignment, testing, and correction allowance: a worked example

This worked example runs the propulsion system install time numbers for a tougher week than the baseline: 18% alignment, testing, and correction allowance instead of the typical 25%. Estimate labor hours to install a marine propulsion system based on engine count, drive type complexity factor, and allowances for alignment, sea connections, and testing.

The inputs for this scenario

  • Number of engines: 2 engines (held at the documented default)
  • Base install hours per engine: 40 hr / engine (held at the documented default)
  • Drive type complexity factor: 1.5 x (held at the documented default)
  • Alignment, testing, and correction allowance: 18 % (the input this scenario stresses; the baseline uses 25)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base propulsion install hours = engines x base install hours x drive type complexity factor.
  • Total propulsion install labor hours works out to 0.05 hr at these inputs, and this is the headline figure for the scenario.
  • Base propulsion install hours works out to 0.05 hr at these inputs.
  • Alignment and testing hours works out to 1.5 % at these inputs.
  • Install rate per engine works out to 40 pieces / min at these inputs.

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.
  • Use it when planning engine-room labor for a build, quoting a repower, or comparing the install burden of different drive configurations. 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

  • 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

  • To rerun this with your own numbers, open the live Propulsion System Install Time calculator, set alignment, testing, and correction allowance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.