I saw that launch too and I though it looked a tad harsh. Mind you, some of the styles used by todays fliers are also rough when compared to yesteryear!
And as for the submarine bit...well one chap did end up with just the bow sticking up. Looked good though, just before it sank, bouncing around like that!
I was dead impressed with the OMRA petrol powered boats - very fast. Using Zenoah engines, for those who wish to know and don't. Not my bag, but damned fun to watch!