George: I was considerably younger in 1981 too !
It must have been the beginning of the chronograph meets arrow speed days. I remember going to an Anderson Archery Clinic in Grand Ledge Michigan in 1982; and they had a chronograph there too.
I was shooting a Bear Kodiak - 60 pounds at 28 inches; and I shot a 31 inch arrow almost to the hilt. I was shooting 125 grain field points; and 2216 shaft at 31 inches; and I was spitting them out at 217 FPS. I shot barefinger and I shoot with 2 fingers so I might have gotten some FPS that way.
I remember that Tom Jennings was there and people were mad at him because my recurve was shooting faster than their compounds.
I have no idea what the weight of the arrow was; I was shooting 5 inch fletch.