Hi Luc.
I think you've missed the point. Shipwreck (the original poster) clearly said that he was using
same mission = same boat , RPM , no damage , same moving , same wind ~(0kn)
like i said same everything
except his rank had changed. Now, I don't know if that is correct, but he was very insistent about it. All of the things you listed make no difference if what he said is correct.
Also you said "Groenegaard explained clearly why it had to be so". He didn't. He didn't specifically test for this possibility when he was checking boat dynamics. As you'll probably be aware, different ranking was not part of test criteria. So again, no proof.
So far no-one has
proven that rank does not affect the speed. We've gone into detail about lots of other things and they don't seem to affect the speed of the vessels. It has been exhaustively and fairly convincingly detailed that wind doesn't affect top speed although waves do. I verified that through experiments today. But Shipwreck said wind=0 in his tests, so all that was irrelevant anyway.
So far we a few possible hypotheses:
(1)
Shipwreck was wrong and some other factor was different apart from Rank, even if he didn't realise it.
(2)
Rank does affect the speed, whether it was intended that way or not.
(3)
Errr....
Even if it is some other aspect that it affecting it, it shouldn't happen, should it? So rank is just as likely as any other unknown variable until we can conclusively prove otherwise.
Let's give Shipwreck some respect and assume that he was giving us the correct information. Then if someone can devise a proper test where rank can be changed and the same course run over by the same ship under the same conditions, we can see if rank does affect speed.
So far there has only been opinions and beliefs. No proof has been offered.
Personally, I expect that there will be something else at work which Shipwreck didn't realise. But, I am experienced enough to know that software glitches occur all the time in totally unexpected ways.