Questions tagged [saturn-v]

Questions pertaining to the launch vehicle developed by Wernher von Braun's team under Arthur Rudolph's supervision at Marshall Space Flight Center for carrying astronauts to the Moon. Saturn V (or C-5 configuration) had three stages with clustered engines F-1 and J-2 and an instrument unit.

18 questions with no upvoted or accepted answers
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Were there any launch vehicles with so heavily pronounced Plume Induced Flow Separation (PIFS), other than Saturn V?

This answer describes a very interesting phenomenon of Plume Induced Flow Separation on Saturn V vehicle. (Apollo-6 S68-29737 photo, courtesy NASA) This is, basically, when "fire" from ...
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161 views

What modifications constituted the ‘reorificing’ of F-1 engines on later Saturn V flights?

The topic of uprating the Saturn V’s first stage engines appears to have been widely discussed, and yet there is little agreement as to how it was done. Early Rocketdyne F-1 engines quote lower ...
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243 views

How much open source is the Apollo program today?

What percentage of NASA's Apollo program is considered to be open source as of today? I mean if I wanted to replicate a lunar mission from scratch exactly the same way they did it, regardless of the ...
4
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193 views

What is known about the trajectory of J002E3 (Saturn V IV-B stage of Apollo 12)?

This answer taught me about J002E3, an object detected in Earth orbit in 2002 that is assumed to be the Saturn V IV-B stage from Apollo 12. It's trajectory through space is fascinating: (source) ...
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665 views

If the J-2X is too powerful for SLS, why was it appropriate for Saturn V?

Reading an article about new engines for the SLS (Summary: There is no plan what to do once the current SSME's are expended), they mention that the J-2X is too powerful for the upper stage of SLS. ...
3
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87 views

Saturn V launch footage from in/on first S-IC stages

There first launches of each Saturn-class rocket were instrumented with, among other sensors, video cameras to learn about the vehicles’ behavior. The cameras were jettisoned at some point and then ...
3
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57 views

How many rising pipes for LOX at the the Saturn V launch tower?

The Saturn V used liquid oxygen for all three stages plus the Apollo Service Module. Were all these LOX tanks filled using the same rising pipe or did they use a seperate pipe for each tank? Using ...
3
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0answers
150 views

Disadvantage of interstage trusses on Soyuz launch vehicle?

Brian Tompsett gave a detailed explanation of the advantages of the trussing in his answer to the question Why do the Russians use these fence-like interstage fairings? The gap between Stage II and ...
3
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139 views

Iterative Guidance Mode (Saturn V ascent guidance)

I tried to implement the iterative guidance mode algorithm given in the paper "Development of the iterative guidance mode with its application to various vehicles and missions" by D. C. CHANDLER and I....
2
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41 views

Drag and lift coefficient tables/plots for Saturn V/Space Shuttle/Other

I'm looking for drag and lift coefficient data to plug into my launch simulation. I could assume constant coefficients, but I'd like to structure my model to accept lookup tables, so I'm looking for ...
2
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259 views

What are these white cylindrical objects pointed in different directions in this photo of the Saturn V instrument unit?

The BBC News article Apollo in 50 Numbers; The Technology shows an image of the Saturn V's computer along with the caption: The Saturn V's computer was probably the largest computer ever blasted ...
2
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1answer
97 views

Switching logic between throttle modes?

At launch, a vehicle like the space shuttle would command its throttle to do a few things: Ramp up to max throttle Hold max throttle Follow a throttle bucket as function of velocity when near max-Q ...
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76 views

Space shuttle digital signal processor (DSP): floating point or fixed point?

Digital signal processors can represent irrational numbers using fixed-point or floating-point data types. Fixed point means fixed number of decimal places, and floating point means floating number of ...
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26 views

Launch escape sequence of events?

Follow up to previous question: Suppose a critical failure triggers the launch escape sequencing controller. A two-engine failure, say, or an attitude error rate in excess of some 5 deg/s in roll (as ...
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29 views

From attitude control malfunction to launch escape Go signal?

I’ve seen and read about launch failures caused by crossed thrust vectoring wires which fed rock and tilt commands to the wrong engine gimbal actuators (rock command going to tilt cylinder and tilt ...
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46 views

What was the volume of the Rocketdyne F-1 engine's main combustion chamber?

In the specifications of the F-1 available online, I can find its dimensions, weight, thrust, etc. but I couldn't find what was the volume of its main combustion chamber. Is this information available?...
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24 views

Falcon 9 CGT Force?

Curious how much force the Falcon 9 cold gas thrusters produce for steering? I've seen numbers in the range of 25--100 lbf, but not sure where in this range (or outside it) the Falcon 9 falls. If you ...
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30 views

3g Throttling: Does Falcon 9 kill engines if acceleration over 3G?

I'm simulating a launch and I often hit minimum throttle before I hit MECO (triggered at 15% fuel mass---my reserve for stage-1 reentry). Acceleration then begins to rise to maybe 3.3 g by the time ...