Bgreene - Looking at those race results from the 1967 race again the 21 seacrafts hung right in the with 27 magnums. 512 miles and the 27 Magnums only averaged 36.9 and 38.3 mph vs. 21 seacraft's 34.3 and 31.7.
36.9 + 38.3 = 75.2
34.3 + 31.7 = 66
66/75.2 = .87766 = the 21 seacraft ride is 88% as good as a 27 magnum
