[FPSPACE] Soyuz touch down
Geert Sassen
geert at navtools.nl
Fri May 2 23:26:18 EDT 2008
I'm still puzzling a bit regarding the april 19 landing and I'm
wondering exactly how rough was the actual touch down.
If you look at several of the pictures taken after landing (for instance
http://a52.g.akamaitech.net/f/52/827/1d/www.space.com/images/080423-exp16-soyuz-02.jpg
) there seems to be a kind of 'hole' or 'dent' or whatever in the ground
some three or four meters upwind of the location of the capsule (wind
direction can be viewed from some flags and also from the fact that
helicopters will normally land pointing into the wind), other pictures
show officials looking at this 'crater' and on the bottom of the DM a
lot of sand can be seen, so it looks like this is the position were the
capsule hit the ground, then bounced up and landed again on its side
several meters further downwind.
The weird thing however is that it was mentioned the softlanding rockets
caused a small steppefire (not unusual, this has happened before), which
also burned the parachute (which we can assume came down downwind from
the DM). However, the only 'burn-marks' on the steppe start apparently
several meters downwind from the location of the DM (in the direction of
the hatch), there is no sign of any burn damage anywhere near the 'dent'
and neither is there any burn damage of the grass anywhere near the
bottom of the DM (there is a lot of sand on the bottom of the DM, but
the grass around it seems unscatched), the apparently area of scorched
and burned grass starts some meters downwind from the hatch.
Unexplained as yet is also the smoke in the cabine, which seems to have
started during the parachute decent. Assuming an overheating panel, they
switched off some instruments, but what exactly was overheating (of
short circuiting?) and what exactly did they switch off.
Remember two important events happen shortly prior to the actual touch down:
1) the shock absorbers of the seats are activated, this caused the seats
to 'rise' up (crew almost touching the instrument panel), and enables
the seats and shock absorbers to withstand the force of the actual
landing, if these shock absorbers are not activated landing will be very
rough.
2) the soft landing rockets fire close above the ground.
Failure of any of these items can cause a very rough landing and
injuries as sustained by Yi
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