Well the Old 21 is 50 years old and so in her honor last night I had a nice open stretch of calm water (ski alley) and with 4 people on board we got it up to 50 according to the gps.
I can say one thing...25 to 45 is a piece of cake. That stroker pulls hard and accelerates quickly. 45 to 48 not to bad. But watching it go from 49 to 50 one tenth of mph at a time is a little time consuming....
