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AvGeeknologist Profile picture
AvGeeknologist
@AGeeknologist
AvGeek, aviation professional, 🇪🇺, tweet in EN, DE, FR. Structural dynamics, aeroelastics and aircraft performance. https://t.co/JZn29tCy47
Jan 2 • 16 tweets • 5 min read
#JAL516 : The damage of the nose may indicate the #A350 hit the DHC-8 in the aft fuselage or vertical tail section area. My illustration shows the two aircraft at scale. Height of the DHC-8 fuselage is 3.4 m (11.3'), but on the A350, damage is visible well above 4 metres.
Image Other possibilities exist as well of course. May have hit wing or other areas. I am just saying, the damage area is well above the DHC-8 fuselage height.
Feb 18, 2021 • 4 tweets • 2 min read
(Thread) Continuing down the EDL sequence of #Mars2020 #MarsPerseverance, how was the Skycrane phase prepared? Obviously, it worked on @MarsCuriosity , was there anything to improve? Apparently, yes. @ATAEngineering performed studies with @MSCSoftware ADAMS to simulate the phase. To simulate the event, a technique called multibody simulation is used (ADAMS is a software dedicated to that). Basically it's a physics simulator to perform analyses in time-domain. That's jargon for "it's a sandbox for engineers".
Feb 18, 2021 • 19 tweets • 5 min read
(Thread) Shall we talk a bit about #MarsPerseverance 's EDL sequence? Let's start with the parachute. The design is called a disk-gap-band parachute. Picture below is from Tutt, Lowry, 2019. As you can see, there is a disk of fabric, a gap and a band of fabric. Hence the name! It's a design already proven on the Viking Mars probes. However, there have been some changes to the original design.