Neil
The ISAF don't issue ratings - 1091 is the current (2015) RYA PN for a full rig Laser.
The UK and US numbers used to be equivalent in the early 1980s - since then the RYA have multiplied the UK numbers by 12 (in a couple of separate steps) to avoid having non-integer values. So for a laser 91.1 x 12 = 1093.
So the D-PN equivalents to the PNs shown in the Aero rules are:
RS Aero 9 1035 - 86.3
RS Aero 7 1065 - 88.8
RS Aero 5 1102 - 91.8
Mark
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