Space station gets free boost from shuttle

Space station gets free boost from shuttle

http://www.msnbc.msn.com/id/8814642/

"Jim Oberg" wrote in message
...
Space station gets free boost from shuttle

http://www.msnbc.msn.com/id/8814642/


tanstaafb

It is only fair since the shuttle puts a "drag" on ISS while attached.

"Jim Oberg" wrote in message
...
Space station gets free boost from shuttle

http://www.msnbc.msn.com/id/8814642/






----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==----
http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups
----= East and West-Coast Server Farms - Total Privacy via Encryption =----

On Wed, 3 Aug 2005 21:25:46 -0500, Jim Oberg wrote
(in article ):

Space station gets free boost from shuttle

http://www.msnbc.msn.com/id/8814642/



I heard your question the other day at the press conference when you
finished up with something like ". . . from some weird cross-coupling
effect . . . that I used to know about." It seemed to draw a chuckle
from the crowd. :-)

--
"Fame may be fleeting but obscurity is forever." ~Anonymous
"I believe as little as possible and know as much as I can."
~Todd Stuart Phillips
www.angryherb.net

On Thu, 4 Aug 2005 07:27:36 -0500, Herb Schaltegger
wrote:

On Wed, 3 Aug 2005 21:25:46 -0500, Jim Oberg wrote
(in article ):

Space station gets free boost from shuttle

http://www.msnbc.msn.com/id/8814642/

I heard your question the other day at the press conference when you
finished up with something like ". . . from some weird cross-coupling
effect . . . that I used to know about." It seemed to draw a chuckle
from the crowd. :-)

I liked his post in which he said that he "innocently asked about what ELSE
the station folks might want to ask" when in fact he asked if the ISS folks were
"getting greedy"

Dale

In sci.space.station Jim Oberg wrote:
Space station gets free boost from shuttle

snip
I should have asked this at the time.
When I was watching NASA-TV, I noted that the russians were unhappy
if the shuttle pushed the station more than 1m/s or so, WRT the next
progress.
Why is this?
Is there that little margin in the progress engines?

Ian Stirling wrote:
When I was watching NASA-TV, I noted that the russians were unhappy
if the shuttle pushed the station more than 1m/s or so, WRT the next
progress.
Why is this?
Is there that little margin in the progress engines?


Progress has to carry as much cargo as it can. The higher the station,
the less cargo it can carry because they have to load more fuel. And
with shuttle gone for the foreseable future, Progress has to be loaded
to the brim with cargo. The next progress is in september so station
will still be "high" because the reboost was weeks late due to Discovery
launching late.

One can argue however that if progress has to spend more fuel to get to
the higher station, it will be spending less fuel to reboost the station
since the station will stayup a bit higher, so having less fuel when it
docks may not make that big a difference.

My guess is that it simply reduces margins, and they probably prefer to
have progress docked with more fuel for emergency manoeuvers to avoid
objects etc.

"Lynndel K. Humphreys" wrote in
:

It is only fair since the shuttle puts a "drag" on ISS while attached.

I find it hard to beleive that the shuttle has more drag than the ISS
(unless the docking positions is belly forward).


--
Doing AIX support was the most monty-pythonesque
activity available at the time.
Eagerly awaiting my thin chocolat mint.

On Sun, 28 Aug 2005 10:35:31 -0500, Jose Pina Coelho wrote
(in article ):

"Lynndel K. Humphreys" wrote in
:

It is only fair since the shuttle puts a "drag" on ISS while attached.

I find it hard to beleive that the shuttle has more drag than the ISS
(unless the docking positions is belly forward).




That's not what Lynndel said. He said it adds drag, not that is has
MORE drag than the station.

--
"Fame may be fleeting but obscurity is forever." ~Anonymous
"I believe as little as possible and know as much as I can."
~Todd Stuart Phillips
www.angryherb.net

Herb Schaltegger wrote in
.com:

On Sun, 28 Aug 2005 10:35:31 -0500, Jose Pina Coelho wrote
(in article ):

"Lynndel K. Humphreys" wrote in
:

It is only fair since the shuttle puts a "drag" on ISS while attached.

I find it hard to beleive that the shuttle has more drag than the ISS
(unless the docking positions is belly forward).

That's not what Lynndel said. He said it adds drag, not that is has
MORE drag than the station.

And even that was wrong. The station had a ballistic number of 156.80 kg/m^
2 before the shuttle docked, and 163.31 kg/m^2 while it was docked. Lower
ballistic number means more "fluffy" hence more drag, so the shuttle
actually *reduced* the drag deceleration on the station while it was
docked.

--
JRF

Reply-to address spam-proofed - to reply by E-mail,
check "Organization" (I am not assimilated) and
think one step ahead of IBM.