Key - description:-
ByCN: Class portsmouth handicap Numbers are
quoted for an upper quartile version rather than the Class
median version. In general terms that means, handicaps refer to the
larger polyester type headsail and full sized spinnaker version
rather than the often more popular vessels with cruising or builder
supplied sails. Clubs may need to adjust a 'Byron Class Number' to suit local
conditions, of course reasons should be declared (ie tidal/course
A vessel specific ByPN handicap/rating calculation can be provided
Class: OD :One Design, DD :Deep Drafted, SD :Shoal Drafted, TM :Tall Mast, GC :Gaff Cutter.
Knots: light displacement hull speed.
Keel: f :fin, ff :flared fin, fb :fin ballasted(lowCofG), b :bulb, w :wing, 2k :bilge, 3k :trikeel, d :drop keel, d. :drop keel fixed down when racing (also fbd. etc), s :swing keel, bb :bilge boards, L :long, 2h 3h :multihull (refer to Boat Keels for more detail).
Engine/propeller: non :no engine, ob :outboard, obf :outboard within hull and fixed down, ibf :inboard +furling prop. ib2 :ib +2 fixed bladed prop. ib3 :ib +3 fixed bladed or more.
Furl: rr :roller reefing/furling sail included.
uSAD: indication of 'on the water' power to weight ratio upwind.
dSAD: indication of 'on the water' power to weight ratio downwind.