Preliminary Gemini 4 Crew Debriefing, Part II, 1965

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White
McDiYitt
13
~IDE►~llM.
pretty straightforward.
I think Pulse was the
best mode on the spacecraft for the orbit phase .
We were able to save all kinds of fuel, it worked
fine, and it was just about what the doctor ordered.
We didn't use the Horizon Scan Mode during about
the first three days of flight, except for the second
orbit when I think I \\18.S in Horizon Sca.n so that I
could have the freedom to help Ed prepare for his
EVA.
The last day we used the Horizon Sca.n Mode,
and I found it to be an excellent mode.
There was
only one case when it broke lock and didn ' t recover.
Wasn't that it, F.d.?
You've got it in the book.
We've got in the book and we'll check on that.
The Ho~izon Scan Mode worked essentially for 24
hours without any problem ~and I think it' s an
excellent control mode,
It seemed to be very
economical on fuel .
We were doing a lot of
yawing around and right at sunrise a.nd sunset it
seemed to get a l ittle nervous , especially if we
had the horizon scanner pointed within about plus
or minus 45 degrees of the sun.
The moon didn ' t
seem to affect it at all. I noticed that, occa­
sionally, we would ~et some thruster blips with the sun
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