Expert is a relative term. Compared to the majority of this news
group, he is a profesional expert in fluid flow. Different types
of fluid flow compared to those you were thinking of, maybe. I
speculate; hydraulics perhaps? A mere tool to him?

self-proclaimed "expert" or not, he made statements to this group as fact that
were not fact. And he did it from the get-go in a fashion to tell one and all
he was b/sing.

he is an electrical engineer by training, training he received in the later
1960's in a country with more sheep than people.

in an email to me he tried to justify his stance by saying something to effect
that the friction in the rudder bearing made the difference.

I suspect the good professor had something to contribute, but he claim b/sing,
so much I so I figureed someone hijacked his email address and he didn't know.