That was a nice video. Very counterintuitive.
From: Bill Prince
Sent: Saturday, May 30, 2020 6:01 PM
To: af@af.afmug.com
Subject: Re: [AFMUG] OT Doug and Bob's Excellent Adventure - 2nd Try
They call it a Hohmann Transfer. They get into an orbit just below the ISS and
orbit until they get out in front of the ISS. Then they turn around and let the
ISS catch up to them.
Watch this video from about the 5:10 point.
bp
<part15sbs{at}gmail{dot}com>
On 5/30/2020 12:09 PM, ch...@wbmfg.com wrote:
I found it astounding to learn that during the first NASA manned docking
test, the guys would give it some throttle and get farther away from the
target. Nobody had thought it through.
More throttle == faster == higher orbit == slower orbital period.
So you have to slow down to catch up if you want to dock. If you are
behind, you slow down until you get ahead and then speed up to raise up and
slow down...
From: Bill Prince
Sent: Saturday, May 30, 2020 12:53 PM
To: af@af.afmug.com
Subject: Re: [AFMUG] OT Doug and Bob's Excellent Adventure - 2nd Try
It's not quite like shooting a bullet. There is a window that they can
maneuver within. It may have to do with the amount of propellant carried in the
"garage" attached to the back of the crew dragon. There also has to be enough
left in that to de-orbit.
I saw a series of diagrams somewhere (maybe on the SpaceX web site?) that
illustrated all the various maneuvers at the different stages.
The approach to the ISS is interesting in that there is an exclusion zone of
sorts all around the ISS. They need to target to outside that zone until they
make their final approach. Once they are in a parallel orbit just outside the
exclusion zone, they can rotate and maneuver into the docking station. The crew
dragon (and the cargo dragon) is that the whole operation is autonomous.
bp
<part15sbs{at}gmail{dot}com>
On 5/30/2020 11:39 AM, Ken Hohhof wrote:
Guy on radio was saying SpaceX crew capsule has to be launched at a
specific time to rendezvous with the ISS, sounds like shooting a bullet. Same
guy said Boeing design will have a wider launch window because it is more
maneuverable. Looking at photos they don’t seem that different. Does this
sound right? Main difference seems to be the way they land, in water or on
land.
Not sure what happens to Boeing capsule if collapse of air travel on top of
737 Max fiasco spells the end of Boeing as a company.
From: AF mailto:af-boun...@af.afmug.com On Behalf Of Bill Prince
Sent: Saturday, May 30, 2020 1:25 PM
To: af@af.afmug.com
Subject: Re: [AFMUG] OT Doug and Bob's Excellent Adventure - 2nd Try
1522 EDT (AKA 3:22 PM)
1422 CDT (AKA 2:22 PM)
1322 MDT (AKA 1:22 PM)
1222 PDT (AKA 12:22 PM)
If you're not on daylight saving time, you know what to do.
bp<part15sbs{at}gmail{dot}com> On 5/30/2020 11:18 AM, ch...@wbmfg.com wrote:
Just a reminder in case you forgot.
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