What do most second stages use for position and orientation – IMUs and a star tracker?
Quote from: dglow on 01/05/2017 06:15 amWhat do most second stages use for position and orientation – IMUs and a star tracker?Launch vehicles don't use star trackers. The IMU's are aligned before launch
https://www.noozhawk.com/article/spacex_falcon_rcoket_launch_at_vandenberg_afb_slips_to_monday
I wonder if there's a link that shows that new NOTAM anywhere?
F9 is vertical and going for an attempt today.Will update again if we hear of a firing. HOWEVER, as per usual, only SpaceX (or Iridium as the customer) can declare a good static fire, usually via Twitter. Then it'll be data review and LRR.
Quote from: Chris Bergin on 01/05/2017 05:22 pmF9 is vertical and going for an attempt today.Will update again if we hear of a firing. HOWEVER, as per usual, only SpaceX (or Iridium as the customer) can declare a good static fire, usually via Twitter. Then it'll be data review and LRR.Are they doing the static fire with the payload attached? :'D
Are they doing the static fire with the payload attached? :'D
Quote from: Jim on 01/04/2017 06:26 pmQuote from: LouScheffer on 01/04/2017 06:24 pmThe hardware seems like it should be capable of doing this,Based on what? Do you know the avionics architecture?It seems this would be a software limitation, not a hardware one, right?
Quote from: LouScheffer on 01/04/2017 06:24 pmThe hardware seems like it should be capable of doing this,Based on what? Do you know the avionics architecture?
The hardware seems like it should be capable of doing this,
Do you have any idea of the time that the static fire could occur? Or is it just wait and see? Thanks
Seems more like a feature that SpaceX deprioritized because it competes with their long-term goals - they clearly prefer to put excess launch vehicle performance towards recovery in order to enable reuse..
Implementing yaw steering might be a low priority for SpaceX since steering gets expensive once your time from optimum exceeds a few minutes. And if I remember right, it takes SpaceX about 10 minutes to recycle the count. By that time the needed yaw steering would only be practical for missions with lots of extra performance. Also, yaw steering would throw yet another wrinkle into recovery of the first stage. So maybe they decided to stick with instantaneous windows for now.
And if I remember right, it takes SpaceX about 10 minutes to recycle the count. By that time the needed yaw steering would only be practical for missions with lots of extra performance.
Also, yaw steering would throw yet another wrinkle into recovery of the first stage.
It doesn't have to be a recycle. It could help when picking up the terminal count late.
1. How many F9 launches did we have a situation where you can see 10 minutes in advance that you would like to move the T0 by a few minutes to get a better odds of a GO - trying to fly between the clouds...? 2. Was there ever a F9 launch scrubbed because the weather was RED at T0 but they could have gotten a GREEN had they been able to adjust the T0 10 minutes in advance?