LOMCEVAK
The reason I mentioned nystagmus was that the IAM docs convinced me many yonks ago that after some high rate rides you should not trust your eyes. So when I had one such ride at Edwards in the second AV-8B (following an aerodynamic departure that popped up in the middle of doing an engine point -as they do....) at the debrief I said I had no idea which way it was rotating. This did not go down well with the young punchy marine who was flying chase who could not understand how a competent tp could fail to know something like that. When asked what he thought had happened it became clear that he was looking the other way and had missed the whole event. Two days later I chased him, he departed and despite my calls on the R/T failed to close the HP cock so wrote off the turbine of our instrumented donk. When I asked why he had failed to shut down the engine he replied he needed to make sure which way the aircraft was rotating. He was asked which way and said left. Wrong I said it was right. The tape said right too. He had never heard of a nystagmus.
J