By Huu Khanh Nguyen · Updated October 28, 2026 · stair, curved-flight
A curved stair flight on an inner and an outer curved string, cut to the steps, that carry the treads from below and leave the tread ends and the risers in view.
| Name | Default | Unit |
|---|---|---|
| Number of risers (the flight has risers - 1 treads) | 17 | |
| Riser height | 175 | mm |
| Inner radius of the flight in plan (the well) | 255 | mm |
| Radial width of the flight | 945 | mm |
| Total turn of the flight in plan | 360 | ° |
| Direction of climb seen from above | left | |
| Tread thickness (z) | 40 | mm |
| Riser boards | true | |
| Riser board thickness | 19 | mm |
| String thickness across the width (radial) | 44 | mm |
| Throat: string material under the inside corner of each cut (plumb) | 54 | mm |
| Finish of strings and risers | white | |
| Turn of one step (readout) | angle / (risers - 1) | ° |
| Walkline distance from the inner edge (readout) | Math.min(width / 2, 500) | mm |
| Going on the walkline (readout) | (innerRadius + Math.min(width / 2, 500)) * stepAngle * Math.PI / 180 | mm |