Hi from AB Video Studio There were so many questions why after a successful
Falcon-9 first stage reentry burn, around 10 seconds after engine shutdown, one of the
fins glows red, then begins to burn.
Guys who watch video are questioning: Why would the grid fins are burning after the
stage had already completed the reentry burn to slow it down?
Also the question was: Why the only one gird fin was burning.
You can see now in video the moment of the reentry burn and moment when right grid fin
is starting to burn.
And then I will show you the burning part of the video in slow motion.
First of all: What is burning?
It's a paint burning, not a grid itselfe.
It's simple like that.
And if you watch carefully, then you will see that the left grid fin was started to
burn as well.
Unfortunately the video camera was failed to cleaning the lenses and we don't see
the actual burning of the paint.
As I already demonstrated in my last video the speed of the descending Falcon-9 first
stage during the separation with the second stage was a little bit faster than 2000 meters
per second or 1.6 miles per second.
Reentry burn was happening about 20-30 kilometers in atmosphere slowing down speed of the spaceship
to about 300-400 meters per second that was still supersonic.
Exactly at this altitude the atmosphere is becoming dense, and air impact is becoming
very HOT.
By the way, Falcon-9 was experiencing the same hot reentry as you see during the meteorites
entering the atmosphere and becoming a fireball.
The only difference is the speed of meteorites that is usually in the range of 14-20 kilometers
per second!
Elon Musk in one of his recent statements mentioned that Grid Fins are taking the biggest
impact of Hot reentry and company is planning to make them out of titanium alloys the same
as supersonic jet aircraft are using.
I hope you like our videos.
Please subscribe to our channel and you are welcome to ask any questions in video comments.
If you didn't watch the actual SpaceX Falcon-9 launch with SES-10 satellite now you have
a chance to see it, if you continue to watching.
Thank you and see you next time.
Bye
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