Calculate sculling span, inboard, or handle overlap, or apply the documented sweep spread-to-inboard guide with explicit dimensions.
How the Rigging Geometry Works
The sculling model assumes equal inboards with both oars straight across the boat: overlap = 2 × inboard − span. Rearranging solves span or inboard. This is idealized geometry: inboard is measured to the collar face, while span is measured between pin centers. The model ignores collar-to-pin offsets, and actual hand overlap varies through the stroke. Check the dimensions and handle clearance on the rig.
| Dimension | Concept2 common context | Calculation role |
|---|---|---|
| Sculling span | 156-162 cm | Distance between the two pins |
| Sculling inboard | 85-90 cm | Handle end to blade-side collar face |
| Handle overlap | 12-20 cm | Amount the handles cross at mid-stroke |
| Sweep spread | About 83-87 cm | Boat centerline to pin |
Sweep inboard guide
Concept2 recommends adding 29 to 31 centimeters to an established sweep spread for a reasonable inboard starting dimension. The calculator lets the user choose that offset and also reverses the relationship.
Why this is not an optimizer
Overall oar length, blade, crew, catch angle, boat speed, foot stretcher, pitch, and rowing style all affect the feel of the rig. Geometry alone cannot identify one best setting.
Sources
Sources: Concept2, Oar Rigging; Concept2, Oars: Length and Rigging, current online editions; accessed August 8, 2026.
