Our PHRF rating in Detroit (Lake St. Clair which is also a light air
area) is 138 with a one design configuration. The 138 includes a
6-second spinnaker pole penalty. We use masthead spinnakers only for
one design racing and we haven't gotten a PHRF rating for racing with
masthead spinnakers. Several people have expressed the opinion that
we would take a 6-second hit, making our rating 132. Most of us don't
think that would be an improvement. The masthead spinnaker helps
mainly in windward-leeward races in light and moderate air because it
allows you to sail deeper and faster. It doesn't work as well in
point-to-point long distance races where you do more reaching.
Other thoughts for PHRF: A couple of our boats have #2 genoas which
are helpful when the wind puts you at the top of the #1 range or when
you are sailing short handed and don't have enough weight on the
rail. If I were racing PHRF I would also consider getting a flat
reaching spinnaker instead of an AP spinnaker if I were doing
distance or other races where reaching is likely. Crew weight is also
a key factor for PHRF. The class crew weight maximum is 880 which
means that your ability to use the #1 effectively tops out around
14-16 knots. Sailing with more crew weight, perhaps up to 1100 pounds
enables you to carry the #1 in higher windspeeds and you will find
that the upwind performance of your boat is very competitive. None of
these changes (#2 genoa, reaching spinnaker, more crew weight) would
result in a PHRF penalty. Several years ago an Express 27 won the
Long Island PHRF championship. The owner told me that he always
sailed with 1000 pounds of crew weight. The only time you want to go
light is in a downwind race like the one from San Francisco to
Catalina Island.