It appeared to me on the net something kept burning at the bottom of SN10 after
the nice landing. Small flame. Leak? Just before the jump and explosion.
John D.
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Anthony Cesaroni
Sent: donderdag 4 maart 2021 5:53
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: SN-10 launch attempt imminent?
Jumped in on the thread sans reviewing previous posts, My bad,
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
<http://www.cesaronitech.com/> http://www.cesaronitech.com/
(941) 360-3100 x1004 Sarasota
(905) 887-2370 x222 Toronto
From: arocket-bounce@xxxxxxxxxxxxx <arocket-bounce@xxxxxxxxxxxxx> On Behalf Of
Thomas Janstrom
Sent: Wednesday, March 3, 2021 11:43 PM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: SN-10 launch attempt imminent?
In this case I'm not so sure we can say "good or not so good" these motors are
copper alloy and don't use the hypergol that the falcons use that gives a
transient green flame on start up. That just leaves over heating/oxidising
copper as the colorant. Neither are good for a reusable motor I'd say.
Thomas.
On 4/03/2021 2:36 pm, Anthony Cesaroni wrote:
Hi Ken,
Green can be good or not so good, How are the students making out with the 7-Up
motor I sent out? Is the motor ingratiated, cold flow tests yet?
Thanks
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
<http://www.cesaronitech.com/> http://www.cesaronitech.com/
(941) 360-3100 x1004 Sarasota
(905) 887-2370 x222 Toronto
From: arocket-bounce@xxxxxxxxxxxxx <mailto:arocket-bounce@xxxxxxxxxxxxx>
<arocket-bounce@xxxxxxxxxxxxx> On Behalf Of roxanna Mason
Sent: Wednesday, March 3, 2021 11:25 PM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: SN-10 launch attempt imminent?
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> 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> 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
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>
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 ;
<https://www.youtube.com/watch?v=sTA0GTgFn5E&feature=emb_rel_err>
&feature=emb_rel_err
https://www.youtube.com/watch?v=XOQkk3ojNfM
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