Table:
text: Salmson air-cooled aero-engines
Salmson post world War One engines
Salmson post world War One engines
Name_ Cyl_ Bore Capacity Power_ Weight
9 AD 9-cyl radial mm (in) l (cuin) kW (hp) at 2,000rpm Weight kg (lb)
9 ADb 9-cyl radial mm (in) l (cuin) kW (hp) at 2,200rpm Weight kg (lb)
9 ADr 9-cyl radial mm (in) l (cuin) kW (hp) at 2,700rpm Weight kg (lb)
7 AC 7-cyl radial mm (in) l (cuin) kW (hp) at 1,800rpm Weight kg (lb)
9 AC 9-cyl radial mm (in) l (cuin) kW (hp) at 1,800rpm Weight kg (lb)
9 NC 9-cyl radial mm (in) l (cuin) kW (hp) at 1,800rpm Weight kg (lb)

text: Salmson air-cooled aero-engines
Salmson post world War One engines
Salmson post world War One engines
Name_ Cyl_ Bore Capacity Power_ Weight
9 NCt 9-cyl radial mm (in) l (cuin) kW (hp) at 1,800rpm Weight kg (lb)
9 AB 9-cyl radial mm (in) l (cuin) kW (hp) at 1,700rpm Weight kg (lb)
9 NA 9-cyl radial mm (in) l (cuin) kW (hp) at 1,800rpm Weight kg (lb)
9 NAs 9-cyl radial mm (in) l (cuin) kW (hp) at 1,800rpm Weight kg (lb)
18 AB 18-cyl 2-row radial mm (in) l (cuin) kW (hp) at 1,700rpm Weight kg (lb)
18 ABs 18-cyl 2-row radial mm (in) l (cuin) kW (hp) at 1,700rpm Weight kg (lb)

Question: Among Salmson's air-cooled aircraft engines, what is the bore for a 9-cylinder radial engine on a 9 AD?