JF Mezei wrote on Fri, 5 Jul 2019
14:29:16 -0400:

On 2019-06-27 14:50, Fred J. McCall wrote:

No. The capsule accelerates away from the stack. That's sort of the
point.

When the stack explodes, there may be portions of the stack propelled
forwards. So the question is whether the capsule will eject at speed
equal to or greater than any debris that could be pushed forward by
explosion.


If you look at the explosive velocity of the propellants, anything is
possible except accelerating humans as fast as a tiny bit of debris
could be accelerated (unless you put a whacking great motor on it and
are willing to get the crew back as jam). However, you have to look
at the odds. First, keep in mind that if there is significant
acceleration toward to capsule from the explosion that the capsule
will also be accelerated by that. Second, remember that the capsule
is a pretty robust pressure vessel while boosters are mostly made out
of aluminum. Third, remember that there is a pressure structure, an
entire second stage, and a payload adapter between the first stage and
the capsule.


(or would explosions generally push debros downward (at engine) or
outwards (at tanks) and not much going forward ?


Explosions go in the direction of least resistance. In this case that
is out the sides, as there are pressure walls and heavy structure at
the ends of the booster.


They have no such rockets. Nothing is anywhere near flight limits.

SO far, they have only re-used 3 times. Surely they have rockets with 3
uses that could be used a 4th time. Even though they may have a goal of
10000 re-iuses (or whateber the number is), the current limit appears to
be 3.


You're really 'stuck on stupid' on this issue, aren't you? Go check
the mileage on your car. Is it your contention that the current limit
on your car is that figure and that if you drive another mile it will
blow up or fail? I'll merely point out that your moving of goalposts
from your original question (cleverly deleted by you) doesn't prove
jack **** and the current limit does NOT appear to be 3.


So pushing the ebveloppe with non-commecial tests may allow SpaceX
to raise the limit of commercial re-uses.


Nope, since they're not planning on recovering the booster from the
Max Q test.


--
"Some people get lost in thought because it's such unfamiliar
territory."
--G. Behn