These Raptor engines sure seem to be fragile when outside of their
operating envelope regardless of the fact that's usually the case with any
engine of its kind.
Seems like a long way to go before a Starship screams into the
Martian atmosphere with 100 people on board.
"You're not learning if you're not crashing regularly" right?
K
On Wed, Mar 3, 2021 at 8:43 PM Thomas Janstrom <thomas@xxxxxxxxxx> wrote:
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/
(941) 360-3100 x1004 Sarasota
(905) 887-2370 x222 Toronto
*From:* arocket-bounce@xxxxxxxxxxxxx <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&feature=emb_rel_err
https://www.youtube.com/watch?v=XOQkk3ojNfM
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