Apollo 11's leap into the unknown - 13 Minutes to the Moon Season 1, Episode 8 - BBC World Service
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- čas přidán 30. 03. 2021
- The 13 minutes begin, but Eagle is going too fast and there are communications problems.
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We have met the people and heard about the Apollo 11 technology, now the descent is underway.
This is the full story and it's a leap into the unknown.
Presented by: Kevin Fong
Starring:
Charlie Duke
Steve Bales
Don Eyles
Courtesy of the Johnson Space Center Oral History Project:
Neil Armstrong
Gene Kranz
Jay Greene
Jack Garman
Bob Carlton
Theme music by Hans Zimmer for Bleeding Fingers Music.
Listen to the podcast: www.bbc.co.uk/programmes/p083...
Watch Season 1 of 13 Minutes to the Moon here: • 13 Minutes to the Moon
Watch Season 2 of 13 Minutes to the Moon here: • Playlist
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Wonderful! Thank You for posting this great series!
i love
Awesome podcast 👍
Watch the series here: czcams.com/play/PLz_B0PFGIn4f0xYPhOk0wIASOYE8-1Wbz.html
Eagle is heading down faster than anticipated...
P63 is a program that fires the descent engine based upon ALL data concerning positioning of the LM after it left the CM. P63 needs the IMU data to know how to calculate and steer the LM to the selected landing area.
The reason cited for Eagle going "long" downrange is excess pressure in the tunnel between the CM and the LM.
As I said above... Why doesn't P63 recognize that the LM is moving down too rapidly from the 'get go?"
The LM IMU only had ONE job to do: keep track of Inertial Movement to feed accurate data to P63. Did it not detect the "pop" and acceleration?
Instead, P63 starts as if everything for the recent 45 minutes is based upon perfect IMU calculations.
Why have the IMU, or P63 if the don't/can't update based upon real time data?
Probably it's more complicated than reported here. But your questions are totally valid, would like to get some answers.
@@kbabioch A lot of things said in this series don't make sense.
And I'm not accusing the producers of knowingly deceiving us... but rather, better quality control.
Initially the full thrust of the descent engine is well below the level to deccelerate at all during descent, and it only gains that ability as fuel is burnt. Thus it must at first increase speed as it descends, before later slowing down. This was anticipated. I have read that it was lunar gravity variations, or mass-cons that contributed to an excess of speed above the expected.
However during early P63 the engine is already at full thrust and can't supply any more of the needed thrust to bring the speed in line with expectations. The business about the pressurisation of the tunnel linking the command and lunar modules, is relevant only if it saved a bit of fuel ie. the lunar module then had an initial mass, prior to PDI, exceeding expectations. Note for P63 the mass ( and for that matter the centre of mass ) is estimated ( by dynamical response ) rather than known precisely. For instance the lunar module had probably another 30 seconds of fuel beyond what was quoted to the crew by Houston. The only way we'll ever know for sure is to go up there and measure the remaining fuel in the descent stage!
In any event it turned out to be good luck as the target area was full of bloody boulders, so going long wasn't all bad.
Please note that Don Eyles ( the P63 programmer ) has written a book, called "Sunburst and Luminary", which deals with all of this.
What a joke!
Why?
@@JohnM3665570Because he's obviously one of those "free thinkers". Move along, nothing to see here.
Yes you are