For those yachts not racing under an ORR certificate, the PCR is computed from
the Northern California PHRF rating with a modification for length, and
displacement/length ratio as follows:
Effective Length: L=
LWL+0.35*(LOA-LWL)
Displacement/Length Ratio:
DLR= (Disp/2240)/((L/100)^3)
Displacement/Length Factor
(DLF):
For DLR less than 75,
DLF = 0
For DLR from 75 to 150,
DLF= (DLR-75)/3
For DLR from 150 to 200,
DLF= 25+(DLR -150)*0.10
For DLR greater than 200, DLF =
30;
DLF is rounded up to the next
larger integer.
Length Factor (LF):
LF = 0.5 * (375 – (3600/(1.34 *
sqrt(L))) + PHRF)
If LF<0 then LF =
0
LF is rounded up to the next
greater integer.
Rating: PCR = 486 + (PHRF + DLF -
LF) * 0.95