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 <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 <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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