Two place to go.. Sailnet has a Morgan group. Great people and you can get info on any Morgan made. As I mentioned before Morgan38.org is the Morgan 38 site and you again can read and see pictures of our Morgans.
I have an 1983 Morgan 384, I don't race but they tell me my PH RF rating is 160. Others on the board have ratings of 140.
Last week: Broad Reach 18/20 kt (true) winds: Boat speed average for 3 hrs 7.5, Beam Reach winds 12/14kt (true) boat averaged 6.5 for 4 hours. Close haul 55 degrees, wind speed 10/12(true) boat speed 6.2. Those are actual speeds averaged last week.
Normally at 10 kts. is where we start to go easily gets to 5.5 to 6 with out much work. Under 10 it's a crap shoot as to what we will do. I've gone 5.5 at 7kts. 60 degrees off the wind. I've also gone 4.5.