Author Topic: SpaceX F9 : Bangabandhu-1 : KSC 39A : May 11, 2018 : Discussion (Read 166621 times)

Kabloona · « **Reply #240 on:** 05/11/2018 05:08 pm »

Quote from: Jim on 05/11/2018 01:11 pm

Quote from: LouScheffer on 05/10/2018 10:39 pm

I wonder if this is some side effect of human rating? To meet NASA specs, they need 40% margin on all parts at all times.

That is not a requirement.

The NASA requirement for human rating is that *structure* has to be designed with a factor of safety of 1.4 instead of the usual 1.25. I expect that's what Elon was referring to.

So all *structural* analysis must show that the main structural components of the vehicle (tanks, interstage, adapters, etc) have a 40% margin under worst-case conditions (eg at max Q).

Then there are other requirements such as two-fault tolerance to critical failure modes that drive all kinds of design decisions for non-structural components that aren't covered by the FS=1.4 requirement.

ZachF · « **Reply #241 on:** 05/11/2018 07:39 pm »

Sky seems a lot clearer today

ZachS09 · « **Reply #242 on:** 05/11/2018 07:44 pm »

Quote from: ZachF on 05/11/2018 07:39 pm

Sky seems a lot clearer today

I agree. Yesterday's weather looked like it was more RED than GREEN regarding the commit criteria.

2008rlctx · « **Reply #243 on:** 05/11/2018 07:51 pm »

Waiting is hard work...

2008rlctx · « **Reply #244 on:** 05/11/2018 07:58 pm »

Webcast live!

ZachS09 · « **Reply #245 on:** 05/11/2018 07:59 pm »

During the final minutes of the countdown, I'm going to keep a close eye on the second stage just in case an AMOS 6-type failure unexpectedly occurs.

I know they fixed the problems that caused that failure, but I'm still a bit worried.

Oersted · « **Reply #246 on:** 05/11/2018 08:13 pm »

Didn't feel very confident about the Falcon Heavy launch, but for this one... I really feel supremely confident.

Go Block 5!

Grandpa to Two · « **Reply #247 on:** 05/11/2018 08:13 pm »

50mph winds at 5miles

Oersted · « **Reply #248 on:** 05/11/2018 08:14 pm »

Oh sweet, drone view of the launch!

Grandpa to Two · « **Reply #249 on:** 05/11/2018 08:15 pm »

1.7 million pounds of thrust for the first time!

MATTBLAK · « **Reply #250 on:** 05/11/2018 08:18 pm »

Slick as glass! Beautiful First Stage flight...

Grandpa to Two · « **Reply #251 on:** 05/11/2018 08:18 pm »

Cut off @8,100km/h think thats the highest first stge flight ?

2008rlctx · « **Reply #252 on:** 05/11/2018 08:20 pm »

Love the second feed video showing the paths of both stages!

yokem55 · « **Reply #253 on:** 05/11/2018 08:22 pm »

The first stage rocketcam is a bit wobbly. It was shaking around with every bump of the cold gas thrusters.

2008rlctx · « **Reply #254 on:** 05/11/2018 08:23 pm »

Falcon has landed!

Prettz · « **Reply #255 on:** 05/11/2018 08:23 pm »

No fire on the legs. They didn't lie.

abaddon · « **Reply #256 on:** 05/11/2018 08:24 pm »

1st stage looks VERY clean compared to Block 3/4 stages to my eye.

Ben the Space Brit · « **Reply #257 on:** 05/11/2018 08:24 pm »

The way the first stage EDL camera was shaking every time the RCS fired, I found myself wondering if it was loose in its mounting.

Oersted · « **Reply #258 on:** 05/11/2018 08:25 pm »

Beautiful camera work around fairing deploy. First seeing the fairings detach and then quickly looking behind to see them swoosh by and disappear into the distance.

Best shot was of the first stage standing proud on "Of Course I still Love You", though.... :-)

yokem55 · « **Reply #259 on:** 05/11/2018 08:26 pm »

Quote from: Chris Bergin on 05/11/2018 08:23 pm

Landed.

The stage looks really clean, relative to previous landings. Looks like it just went on a short stroll...