95% is not 100%
It has been told by generations of the mighty GTS FINNJET achieving her design speed of 31 knots during the first sea trials. What they forgot to say was, she could go even faster.
On December 10th, 1976, 11:20hours Finnish time, GTS Finnjet accelerated past her design speed and up to 32,2kn.
Source: FHSry Archive B, L1, M, ECR log: 9th-12th December 1976