Spacelog Apollo 11

Yes indeed. O₂ fuel cell purge at 71 hours, and when you feel like copying, I've got a flight plan update containing—I guess that and some other items for you.

Houston, Apollo 11. Go ahead with the flight plan update.

Okay. We'll get started on the fuel cell purge while we're eating. CO₂ canister change number 6; secondary radiator flow check; copy some pads. Also at 72 hours, stop PTC 0 roll at 73; do a P52 option 3; we'll get your uplink REFSMMAT for the landing site; and at 000—let's see, now was this with the old REFSMMAT or the new REFSMMAT?

This is with the —

— … antenna and, pitch —

— This is with the new REFSMMAT, Buzz.

You said you want the P52 done at that attitude with the new REFSMMAT?

Roger.

Apollo 11, this is Houston. Over.

Apollo 11, this is Houston. Over.

Apollo 11, this is Houston. Over.

Houston, go ahead.

Roger, 11. Correction on my last. At 73 20, we uplink you the new REFSMMAT. And at 73 30, we'd like you to maneuver to 0 roll, 0 pitch, 0 yaw in the old REFSMMAT. And then torque around to the new REFSMMAT and run your P52 option 1 in that same inertial attitude. Over.

Roger, Understand.

I've got consumables update, when you're ready to copy.

I just got up, but you didn't catch me on that one.

I say I have one for you.

Okay. We're ready to copy that consumable update.

Roger. As of GET 68 00, RCS total minus 4.5 percent, corresponding to approximately minus 53 pounds. Alfa minus 6.0 percent, minus 1.0 percent, minus 7.0 percent, minus 3.0 percent; H₂ total, minus 1.2 pounds; O₂ total, plus 10 pounds. Over.

Roger. And our readouts on board are Alfa is 82, Bravo is 84, Cocoa is 84, and Delta is 87.

Houston. Roger. Out.

And you want us to cycle the O₂ and H₂ fans, I imagine?

11, this is Houston. Affirmative. Over.

Houston, Apollo 11. I have a status report for you.

Go ahead, 11.

Roger. On sleep; CDR, CMP, 7.5; LMP, 6.5. Over.

Roger. 7.5 for each. Over.

Negative. LMP 6.5.

Roger. 7.5, 7.5 and 6.5. And I got a few words for you here on the SPS engine performance. Over.

Okay. We're ready to listen.

Okay, 11. It turns out that the engine performance during both of your burns so far this mission has been the same as it was on engine acceptance tests. The onboard PC reading is due to a known gage calibration factor between what you've actually got in the chamber and what you're reading out on the gage. We expect single bank operation to be 90—that is, 90 psi on the gage with an actual chamber pressure of 95 psi. In dual bank operation, the chamber pressure is 94 psi on the gage with an actual of 99 psi. 80 psi on the gage on board correlates to 83 psi actual. And we recommend that you stick to an LOI termination cue of 80 psi on the gage. That is, no change to the mission rules. Over.

Apollo 11. Roger. We got all that.

Roger. What sort of settings could you recommend for the solar corona? We've got the Sun right behind the edge of the Moon now.

Roger.

It's quite an erie sight. There is a very marked three dimensional aspect of having the Sun's corona coming from behind the Moon the way it is.

Roger.

And it looks as though—I guess what's giving it that three dimensional effect is the earthshine. I can see Tycho fairly clearly—at least if I'm right side up, I believe it's Tycho, in moonshine—I mean, in earthshine. And, of course, I can see the sky is lit all the way around the Moon, even on the limb of it where there's no earthshine or sunshine.

Apollo 11, this is Houston. Over.

Go ahead.

Roger. If you'd like to take some pictures, we recommend using magazine Uniform which is loaded with high speed black and white film, interior lights off, electric Hasselblad with the 80 millimeter lens. And you're going to have to hand hold us, I guess. We're recommending an f stop of 2.8, and we'd like to get a sequence of time exposures. Over.