NASA still hasn't decided on how Boeing Starliner astronauts will return.
But recent developments, and NASA's mention of an "unsuited return" have led to a lot of questions about why the launch and entry suits aren't compatible between Boeing and SpaceX. Let's dive into what that unsuited return means, how launch and entry suits are used, and why NASA didn't mandate compatibility here.
#space #starliner #boeing #spacex #nasa #iss
Why didn't NASA make Boeing and SpaceX's spacesuits compatible?
NASA still hasn't decided whether Boeing Starliner astronauts will return on their original spacecraft or a SpaceX Crew Dragon. But recent developments, and ...YouTube
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Martin Hoffmann
in reply to Ondřej Caletka • • •Ondřej Caletka
in reply to Martin Hoffmann • • •@partim Yeah fair. I was just surprised by the amount of technology involved yet still requiring a human in the loop.
I remember such crossings with a person operating the crank from a glass booth.
As soon as buttons were involved, the crossings became automatic and only signal back the closed state which is a requirement for proceed signal if the track is occupied - no visual check of the crossing was/is done.
Martin Hoffmann
in reply to Ondřej Caletka • • •Ondřej Caletka
in reply to Martin Hoffmann • • •@partim As far as I know, in Czechia, it is required to have equipment to check horizontal position of the barriers on "level crossings **exceptionally** built on tracks designed for speed over 120 km/h" - on the main line between Praha and Ostrava, there are 88 such crossings.
Also once the conditions are fulfilled and proceed signal is given, even breaking the conditions (like lifting the barrier) will not change the signal.
Pavel Machek
in reply to Ondřej Caletka • • •David Jaša
in reply to Pavel Machek • • •@pavel the flip side is then longer time between warning start and arrival of the train. Aren't those times already unacceptably long here in CZ?
@Oskar456
Pavel Machek
in reply to David Jaša • • •Ondřej Caletka
in reply to Pavel Machek • • •@pavel @djasa yeah, there's this saying that: "better closed railway crossing than closed (jailed) designer."
But it's slowly getting better.
As a pedestrian, I have a similar feeling about traffic lights designers in Czechia. Those people have to absolutely hate pedestrians.
David Jaša
in reply to Pavel Machek • • •@pavel
This only makes sense until you delve into implementation and its regulatory boundaries.
Like. From railway side, it would require signalling to convey movement authorities for trains with a different speeds 1. for the driver and 2. for the automatic train control with speed enforcement and 3. you need to integrate crossing equipment with other parts of signalling/interlocking. What's the status of these requirements in infrastructure and vehicles...?
Ondřej Caletka
in reply to David Jaša • • •