Average Skidder Turn Cycle Time

Audit complete observed skidder phase cycles and actual payload throughput, not average phase duration or a generic travel-time estimate; no travel terrain, load capacity or operator safety inferred.

Description

A skidder turn consists of complete travel, loading and unloading phases.

A skidder turn consists of complete travel, loading and unloading phases. Pooled payload throughput must use total elapsed cycle time rather than average phase duration.^[1]

Audit complete observed skidder phase cycles and actual payload throughput, not average phase duration or a generic travel-time estimate; no travel terrain, load capacity or operator safety inferred.

When to use Average Skidder Turn Cycle Time

Use this tool to audit complete observed skidder phase cycles and actual payload throughput, not average phase duration or a generic travel-time estimate; no travel terrain, load capacity or operator safety inferred.

Gather the tree inventory, plot measurements or model parameters. Check diameter, area, time and moisture conventions; keep paired observations aligned.

How to use Average Skidder Turn Cycle Time and understand its results

Gather the tree inventory, plot measurements or model parameters. Check diameter, area, time and moisture conventions; keep paired observations aligned.
Enter cyclePhaseTimesMinutes, turnPayloadVolumesM3 using the field table and calculation rules, then run the tool.
Read turnCycleTimesMinutes, meanCycleTimeMinutes, observedTurnPayloadThroughputM3PerHour. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
cyclePhaseTimesMinutes	Cycle phase times minutes	list of list of number	Required
turnPayloadVolumesM3	Turn payload volumes m3	list of number	Required

Enter a rectangular matrix with four nonnegative phase minutes per turn—unloaded travel, loading, loaded travel, unloading—and aligned positive payload m³. Require every cycle total positive. Return turn totals, arithmetic mean cycle minutes and pooled throughput.

Paired lists must be nonempty and have equal lengths.

cycle minutes=sum four phases; throughput m³/hour=60 × total payload/total cycle minutes

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
turnCycleTimesMinutes	Turn cycle times minutes	list of number
meanCycleTimeMinutes	Mean cycle time minutes	number
observedTurnPayloadThroughputM3PerHour	Observed turn payload throughput m3 per hour	number

json

{
  "input": {
    "cyclePhaseTimesMinutes": [
      [
        1,
        2,
        3,
        4
      ],
      [
        2,
        2,
        2,
        2
      ]
    ],
    "turnPayloadVolumesM3": [
      2,
      4
    ]
  },
  "output": {
    "turnCycleTimesMinutes": [
      10,
      8
    ],
    "meanCycleTimeMinutes": 9,
    "observedTurnPayloadThroughputM3PerHour": 20
  }
}

Limitations and assumptions

Terrain, load capacity and delays beyond the recorded phases are not inferred.

Numeric inputs and returned numeric values must be finite; an unrepresentable returned value produces an error. Matrices are limited to 128 rows and 128 entries per row; other numeric lists are limited to 100,000 entries. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Harvest System Productivity m³/PMH: Separate observed delivered-volume productivity per productive/scheduled machine hour and utilization; operational delays remain explicit and no machine capability guarantee. For a complementary task, use Helicopter Log Payload Cycle Minute: Screen complete log-haul cycles from caller already-established available payload, rigging, green density and cycle duration; does not compute aircraft performance, approve lifts or certify external-load safety.

References

Average Skidder Turn Cycle Time — tool.io

Similar or alternative tools

Harvest System Productivity m³/PMH
Separate observed delivered-volume productivity per productive/scheduled machine hour and utilization; operational delays remain explicit and no machine capability guarantee.
Helicopter Log Payload Cycle Minute
Screen complete log-haul cycles from caller already-established available payload, rigging, green density and cycle duration; does not compute aircraft performance, approve lifts or certify external-load safety.