Agreed lots of successes here, this validates quite a few of the new
tech they are implementing. My suspicion is the fuel rich motor was
intentional throttling, but the greenish flame likely unintentional,
seems raptors have a habit of running "raptor rich" shall we say.
Thomas
On 4/03/2021 2:25 pm, roxanna Mason wrote:
Green flames can not be good even if intentional if you want reusability. The flight regime appears good though, the part of the mission that should have been the most problematic. So again, Go SpaceX!
K
On Wed, Mar 3, 2021 at 8:07 PM Thomas Janstrom <thomas@xxxxxxxxxx <mailto:thomas@xxxxxxxxxx>> wrote:
Several observations from the footage available:
Firstly the land legs didn't lock into position
That landing was HARD, there was at least a meter worth of bounce,
notice the transition from the nose to body crumpled.
There was likely quite a bit of impact related damage to the
plumbing given the forces involved
Pooling Lox+Lmethane in a confined space is always a bad thing,
the detonable range is just so huge and requires almost no input
energy to ignite, a warm rocket engine will do.
During flight one engine was running oxidiser rich (greenish
flame) and another fuel rich whether this was intentional or not
we might never know.
So yes it landed and thats a big success but they need to work on
those legs, they have been a potential issue since SN5.
Thomas.
On 4/03/2021 1:56 pm, roxanna Mason wrote:
Did they totally shut down all electrical systems that could be
an ignition source, or is it hopeless having oxygen and
methane intimately mixed?
Reminds me of the DCX when it blew up after a landing gear failure.
K
On Wed, Mar 3, 2021 at 7:31 PM J Farmer <jfarmer@xxxxxxxxxxxxx
<mailto:jfarmer@xxxxxxxxxxxxx>> wrote:
It was sitting at a tilt after landing. Apparently the
landing gear has been a concern. My supposition was that one
or more didn't extend or lock on extension.
My first thought after the explosion was that the landing
gear failure caused a slow methane leak. That seemed to be
born out by the extended hose down of the vehicle by the
ground crew.
John
On 3/3/2021 7:38 PM, Henry Vanderbilt wrote:
Yup, blowed up real good! Vid of the post-landing explosion
here: https://www.youtube.com/watch?v=HECTypGUfQE
<https://www.youtube.com/watch?v=HECTypGUfQE>
I think we can say with certainty that some quantity of
methane ignited. Apparently under/inside the base of the
vehicle. Beyond that, insufficient data. Scheduled venting
or a flight-damage leak? No data.
Henry
On 3/3/2021 4:39 PM, Brian Feeney wrote:
Oops! Actually in several pieces now.
Maybe Liquid Methane pooling under the vehicle??
Cheers
Brian
On Wed, Mar 3, 2021 at 6:26 PM Henry Vanderbilt
<hvanderbilt@xxxxxxxxxxxxxx
<mailto:hvanderbilt@xxxxxxxxxxxxxx>> wrote:
And she's down, in one piece. Lit 3 for the final
rotation, shut two down and landed on one. Slight
visible bounce visible at touchdown, fwiw. Congrats to
everyone at SpaceX!
Henry
On 3/3/2021 4:12 PM, Nels Anderson wrote:
Now chilling engines... T-3:00??
https://www.youtube.com/watch?v=sTA0GTgFn5E&feature=emb_rel_err ;
<https://www.youtube.com/watch?v=sTA0GTgFn5E&feature=emb_rel_err>
https://www.youtube.com/watch?v=XOQkk3ojNfM ;
<https://www.youtube.com/watch?v=XOQkk3ojNfM>
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