Just found this thread and had to add my 10p worth.
Many years ago, during my days on a sailing club committee, I was trying to persuade the bunch of Lt Commader RN (Rtd) on said committee that we could do with a rescue boat that could keep up with someting faster that the West Weight Scows that they sailed.
I borrowed a brand new 5m from BWM with a pair of 35s on the back for a Open we were holding.
Well, the performance had to be checked, so the wife and I trundled down Chi Harbour and out past the beacon and then I opened it up. The thing really flew, litterally, over a couple of waves.
So What happened next?
(Clue - BWM did told me that the engines were NOT bolted on yet but the clamps were tight, but please check them now and again.)
"A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools" Douglas Adams