iOS · OAR SETUP
Oar settings and calibration
Save the oar dimensions, align the sensors, and set the scale that converts bend into moment.
Choose the correct oar
For rowing, select the oar in Connect Oar, or scan its oar label. Confirm that the connected sensors belong to it.
In Oar Settings, choose the oar whose details you want to inspect. The screen shows Active Oar details or Selected Oar details; use Edit details to check side, type, model, length, inboard/outboard and S1/S2 positions. You can inspect saved oars while disconnected. Selecting a details or calibration target does not change the rowing connection.
Manage Oars includes saved oars, named pairs and independent managed copies, with their alignment and stiffness histories. Verify which record you are editing. Manage oars guide →
Align the sensors
Open Align Sensors for the selected oar. Record Bias, Feather and square, Feathered level sweep and Square level sweep, then calculate and save the alignment.
The optional Squared float follows saved alignment: square the blade, float it on the water with the boat level, hold steady for 12 seconds and save an accepted capture to Oar Settings. A separately measured depth can accompany this reference.
Calibrate Oar Stiffness
A known-weight calibration measures Cperm, the shaft’s stiffness constant. The app uses Cperm, the selected shaft model and the current oar dimensions/sensor positions to calculate Moment/Bend Factor (MBF).
Alternatively, enter a Cperm already measured for this shaft, or enter a manual MBF estimate. Dimensions alone cannot determine stiffness. Matching PowerSplit to a familiar effort is an estimate, not a measured calibration.
Known-weight calibration → · Dimensions and sensor positions →
Which value takes priority?
| Priority | Source | What happens |
|---|---|---|
| 1 | Manual Moment/Bend Factor | The entered MBF is used directly. Cperm and dimensions do not calculate the factor; saved inboard still determines handle force. |
| 2 | Manual Cperm | The entered stiffness constant and current dimensions calculate MBF. |
| 3 | Measured Cperm | The selected calibration’s stiffness constant and current dimensions calculate MBF. |
These priorities apply while the corresponding manual overrides are enabled. Saving a new measured stiffness calibration selects its measured Cperm and turns off both manual MBF and manual Cperm overrides. Earlier calibration records remain in the history. Changing dimensions alone does not turn off an active direct MBF override. Check the displayed value, source and units before recording.
What the units mean
Moment (N·m) = MBF (N·m/°) × bend (°). Perpendicular handle-tip force (N) is moment divided by inboard length (m). Work adds positive moment × forward sweep in radians. Power divides drive work by the whole stroke cycle, including recovery.
Current iOS and report controls display Moment/Bend Factor, N·m/°. Older files may store FBF in J/degree²; the software converts that legacy value by 180/π. Do not convert a field already displaying N·m/° again.
When the setup changes
For the same shaft and shaft model, Cperm can be reused with unchanged sensor positions and modest changes to length, inboard or outboard. Update saved dimensions and positions whenever they change by more than 0.5 cm. Larger geometry changes, or moving a sensor more than 2 cm, need suitable taper measurements for the shaft model or a new known-weight calibration. Repeat alignment whenever a mount moves or rotates. A different shaft needs a suitable stiffness value.
Keep the dimensions filled in even with a manual MBF. New workouts capture the oar settings, calibration source and applied factor, and show them on the server under Recorded oar settings. Editing an analysis does not overwrite that recording snapshot.