I remember as a newly rated NVFR PPL taking off on a black night. Something did not seem right at the time during early climb and I quickly went to instruments. I remember once in the cruise being a bit confused about what went on shortly after departure. My training had not covered the illusion, but had covered the importance of the AH.
It was only a year or so later that I read about the somatogravic illusion and the penny dropped.
For those interested, in my part of the world the illusion can happen during the day in white out conditions too...
-----------------------------
And maybe the mods could move single engine performance issues to another thread of its own? The discussion and errors in the discussion are likely not relevant here, but it's an important argument to have to thrash out the truth from the heresay and misunderstanding. May I also suggest the protagonists study the aircraft certification FARs...