Two flights of one stage Falcon 9 in one video
An interesting visual comparison has already been made on YouTube, having combined both flights of the first stage of the Falcon 9 in one frame, which last week made a second flight.
Curious to see the differences in the video:
First, the difference in the trajectories is visible - the launch from the Dragon CRS-8 was made on the ISS, and from SES-10 on the geo-transfer orbit. In the latter case, due to launching into an intermediate orbit with an 18-minute pause between the first and second turn-ons of the second stage, the trajectory turns out to be flatter, therefore in launching from SES-10 the speed grows faster and the height is slower.
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Secondly, the shutdown of the first-stage engines in the case of the SES-10 occurred about four seconds later. Most likely, this is due to the fact that the over-caliber fairing is experiencing increased aerodynamic loads, and in the area of maximum velocity head (Max-Q), the thrust of the first-stage engines decreases more strongly or for a longer time. UPD : in the comments in the LiveJournal found an analysis with Reddit , and on it, on the contrary, the missions with the Dragon, including the CRS-8, reduce cravings for a longer time, and according to the scheme it turns out that the level with SES-10 just accelerated longer , and in tanks on start-up CRS-8 there is more fuel left.
Thirdly, it would be logical to expect an earlier landing, but here, in the case of the SES-10, the level of the village is about ten seconds later than that of the CRS-8. Everything rests on specific braking algorithms, and, without an exact knowledge of the flight parameters, it is difficult to say why this happened.
Curious to see the differences in the video:
First, the difference in the trajectories is visible - the launch from the Dragon CRS-8 was made on the ISS, and from SES-10 on the geo-transfer orbit. In the latter case, due to launching into an intermediate orbit with an 18-minute pause between the first and second turn-ons of the second stage, the trajectory turns out to be flatter, therefore in launching from SES-10 the speed grows faster and the height is slower.
')
Secondly, the shutdown of the first-stage engines in the case of the SES-10 occurred about four seconds later. Most likely, this is due to the fact that the over-caliber fairing is experiencing increased aerodynamic loads, and in the area of maximum velocity head (Max-Q), the thrust of the first-stage engines decreases more strongly or for a longer time. UPD : in the comments in the LiveJournal found an analysis with Reddit , and on it, on the contrary, the missions with the Dragon, including the CRS-8, reduce cravings for a longer time, and according to the scheme it turns out that the level with SES-10 just accelerated longer , and in tanks on start-up CRS-8 there is more fuel left.
Thirdly, it would be logical to expect an earlier landing, but here, in the case of the SES-10, the level of the village is about ten seconds later than that of the CRS-8. Everything rests on specific braking algorithms, and, without an exact knowledge of the flight parameters, it is difficult to say why this happened.
Source: https://habr.com/ru/post/402865/
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