Oleg Zabluda's blog
Thursday, October 12, 2017
 
SpaceX Falcon-9 : SES 11/Echostar 105 : Oct 11, 2017

SpaceX Falcon-9 : SES 11/Echostar 105 : Oct 11, 2017

Три поюзанные ракеты стояли там у моря,
третья поднялась и приземлилась вскоре
и вот вам результат -
три поюзанные ракеты стоят

At the end of the reentry burn it was going at 1.7 km/s! With Aluminum grid fins yet! Glowing white-hot!
https://forum.nasaspaceflight.com/index.php?action=dlattach;topic=40725.0;attach=1453492;image

"""
The grid fins were not "White hot", since Aluminum, even when "red hot", is already without any strength.

There are two options:

A very over-exposed image show with a filter-less camera that picks up near infra-red, and so even the slightest glow in human-invisible wavelengths shows up as "white hot".

A thermal coating ablating while protecting the Aluminum underneath.
"""
https://forum.nasaspaceflight.com/index.php?topic=40725.msg1735660#msg1735660

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