Re: TALGO tilt trains

["David Proctor" <daproc.spambait@umpires.com>]

David Bromage wrote in message <75kera$om6$3@news.mel.aone.net.au>...

>That was a problem with the short lived British APT, or so is popular
>belief. The problem was actually that the tilting was so soft that there
>was no sensation of the tilt, yet you could see the horizon move.

Sort of - it wasn't that the tilting was so soft, but that it perfectly
compensated for the curve that the train was going around - the sensation
that you mentioned was correct - the middle ear detected that the body was
level, but the eyes picked up that the body was tilted, hence the conflict.

Current tilt systems get around this by compensating for all but 2-3% of the
forces - so both the middle ear AND the eyes pick up that the body is not
level, and the nausea does not occur.

David Proctor
daproc.spambait@umpires.com