Keenan or Julie wrote:

[...]
If the damned boat is the same design only longer, it goes faster.

Depending on the power of the 'engine', it could as well go
slower...

Beyond that this whole discussion sounds like geeks on steroids to
me.

Perhaps, but if you choose a longer boat with the illusion that it
goes faster while in reality it will only make you work harder or go
slower, that persons will need the steroids or may be quite
disappointed.