141 may be generous. In SoCal, the e-27 rates 132, with the J/30 and SC 27 rating 138. Ralph Deeds has more insight on MH spinnakers.

:: We are in a light to med wind area on mobile bay.Our
:: PHRF class is J 30s, Pearson Flyers Olson 911's Santa
:: Cruse 27 and others. We all rate 3 seconds of each other
:: with the express @141 and others @138.Would a mast head
:: spinnaker work in these wind conditions with a 6 second
:: hit and would it pay to cut the pole back and only take
:: a 6second hit from our base of 144. istead of 9seconds
:: total. thanks P S the boat goes back in the water in 2
:: weeks and I need to have all my bases covered as I brag
:: alot. thus I'm keeping the old name on the boat. EXPRESS
:: YO SELF