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.

Filter by
Sorted by
Tagged with
4
votes
1answer
107 views

Why did Apollo missions open the propulsive Hydrogen vents during the coast phase?

According to Figure 2-1 of the SA-503 flight manual the LH2 continuous vent was opened during the coast phase, and closed during the ullage stage of the S-IVB restart T_6 + 0:00:42.0 (but open for ...
5
votes
1answer
139 views

Are there any markings that uniquely identify each Saturn-Apollo combination?

This question made me wonder: are there any markings on the Saturn I/IB/V launch vehicle, Apollo service module or command module that uniquely identify each vehicle (i.e. AS-5xx)? It doesn't have to ...
2
votes
1answer
62 views

Identifying attitude control mode in GNC software?

Launch vehicles will generally have multiple multiple attitude control modes. At launch, the engine-gimballing thrust-vectoring system is in charge. In orbit, the reaction control system is (at least ...
1
vote
0answers
78 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 ...
2
votes
1answer
98 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 ...
11
votes
1answer
859 views

What barge route did the Saturn S-II take from California to Florida?

The first stage (S-IC) of the Saturn V rocket was produced at the Michoud Facility in New Orleans. Too large to be transported by railroad or airplane, it was delivered to Kennedy Space Center by ...
14
votes
1answer
2k views

Why did each F-1 engine have dual fuel feedlines?

Each F-1 engine had two fuel feedlines connecting it to the fuel tank as shown in these contemporary photographs and drawings. The corresponding LOX system only had one feedline. The engine had a ...
17
votes
2answers
2k views

Engine failure: how to detect?

Saturn V would automatically initiate launch abort if: Launch vehicle rates exceeded a threshold (4 deg pitch/yaw, 20 deg roll) Two or more booster engines dropped below 90 % rated thrust I'm ...
1
vote
0answers
27 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 ...
1
vote
0answers
30 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 ...
5
votes
2answers
190 views

Interpolation method in pitchover maneuver: what type?

Consider the space shuttle or the Saturn V. Launch would begin with an open-loop pitch schedule obtained from simulation with the day’s winds. The pitch schedule would be specified as a lookup table ...
5
votes
1answer
128 views

Logic sequencing: From fault detection to launch escape?

So I'm working on fault insertion for my launch simulation. It's basic: I flip a switch to kill the booster engines of my choice. If two or more engines die, separation is triggered and the launch ...
2
votes
0answers
42 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 ...
4
votes
2answers
153 views

Correcting Accelerometer Readings when Offset from Center of Mass: How?

A follow-up to an earlier question. So I've accepted that I need to correct my accelerometer readings for the accelerometer offset from the center of mass. The offset means that whenever the rocket ...
3
votes
2answers
49 views

Jimsphere example data for wind speed/direction vs altitude?

I've added load relief to my thrust-vector controller (TVC) and would like to simulate it with some realistic wind data, ideally up to 80 km or higher. I know wind speed and direction would be ...
1
vote
0answers
49 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?...
3
votes
1answer
114 views

Moment of inertia data for rocket stage?

I'm modeling a rocket launch and would like to compare my calculated moments of inertia to actual real-world data from other rockets. Any rocket would do, though those similar in size to Falcon 9 ...
10
votes
1answer
1k views

Does a photo with two Saturn V's on launch pad 39A and 39B exist?

There is a beautiful photo of two Space Shuttles on launch pads 39A and 39B. Apollo 10 was the only Saturn V launch from pad 39B. Were either Apollo 9 or Apollo 11 close enough in time to have two ...
6
votes
2answers
520 views

Were all three Mobile Launch Platforms ever in use simultaneously?

With an optimistic view on the future, NASA built a Vertical Assembly Building with four bays and three Mobile Launch Platforms. They were later repurposed for the Space Shuttle and other launch ...
3
votes
2answers
445 views

Ullage control with single engine stage?

How does a single-engine upper stage, like that of Falcon 9, do ullage control before starting the engine? Does it fire its cold gas thrusters? Does it fire the engine at minimum throttle for a second ...
0
votes
1answer
49 views

Ullage control on stage shutdown?

Is ullage control a thing only engine startup? Would a rocket like the Saturn V or Falcon 9 leave an engine running for a second or two longer just for ullage control?
0
votes
0answers
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 ...
0
votes
1answer
474 views

who decided Saturn V configuration [closed]

Saturn family of rockets were designed to launch heavy payloads into orbits. After 25th of May, 1961, who conceived the idea that various Saturn vehicles can be put together in series to create a ...
34
votes
2answers
4k views

Saturn V's external blueprints

I'm not sure if this is the right place to ask but I don't know where to ask. I want to get a high quality orthographic blueprints of NASA's Saturn V rocket with dimensions and everything (I need it ...
6
votes
1answer
181 views

Separation of the stages of Saturn V by pyrotechnics, what about electrical and mechanical connections?

We know that the stages of Saturn V were mounted to each other with explosive bolts. Separation was done by ignition of these pyrotechnics. But we also know the control computer of the Saturn V was ...
4
votes
0answers
249 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 ...
9
votes
3answers
1k views

Could the Soviets have gotten to the moon using multiple Soyuz rockets?

Saturn V's payload was 140 tons, about 20 times that of Soyuz. The Soviets did not have a functioning rocket with similar characteristics. But couldn't they launch 20 Soyuz rockets, assemble the ...
1
vote
1answer
75 views

Noninertial effects a problem in strapdown IMUs?

Unlike stable-platform IMUs, which are fixed in space and therefore inertial, strapdown IMUs are fixed to the vehicle's body and therefore noninertial. Would noninertial effects distort the strapdown ...
1
vote
0answers
25 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 ...
12
votes
2answers
806 views

How do they determine dynamic pressure has hit a max?

Max-Q is a key event during launch, and dynamic pressure is closely monitored so they know when a max is hit. But how exactly do they know when Q hits a max? If you track the rate at which Q is ...
4
votes
1answer
88 views

Purpose of Initial yaw Maneuver?

I've read the Saturn V began launch with a short yaw maneuver which lasted from t+1 through t+8.25. The purpose mentioned for the maneuver is to avoid contact with the launch tower. But now that I ...
3
votes
0answers
88 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 ...
9
votes
1answer
874 views

What happened to Skylab 1's Saturn instrumentation unit?

The image in this answer shows the Saturn Instrumentation Unit (I.U. in the picture) in its usual position above the Saturn V third stage, at the launch of Skylab 1. What happened to the IU after the ...
2
votes
0answers
49 views

What did the Saturn V interstage camera capsules look like? [duplicate]

Apollo 4 and 6 each carried a pair of high-speed cameras on the second stage of the Saturn V launch vehicle. They filmed the separation of the first stage and its interstage ring, after which the ...
6
votes
1answer
131 views

What is a throat plug used for?

This cutaway drawing of the F-1 injector plate has a "throat plug insert" annotated. What is a throat plug? What is it used for?
4
votes
2answers
118 views

Is there anything left of the J-2 test stands at Santa Susana Field Laboratory and the F-1 test stands at Edwards AFB?

The Mississippi Test Facility (now Stennis Space Center) is used for a lot of rocket testing, including testing the F-1. However, many of the test stands are now gone. Rocketdyne, however, also had ...
1
vote
2answers
78 views

During an Apollo mission, were separations after dropping the S-II considered as staging events?

I would like to clarify what is a staging event. Maybe there is no definite definition. First I though it was easy as the Nasa definition is clear. Then I though of the stage-and-a-half Atlas SLV-3, ...
14
votes
2answers
1k views

Improvements in Saturn V, LM and CSM after Apollo 10

Apollo 10 is considered to be full dress rehearsal for Apollo 11. Did the trial flight of Apollo 10 identify any improvements that were needed in the Saturn V, CSM and LM, to be done before Apollo 11 ...
3
votes
1answer
222 views

Was the Saturn V ever stacked anywhere other than KSC?

I’ve always thought that the only place you could have ever seen a full Saturn V standing upright was the Kennedy Space Center. Is this true, or has the Saturn V ever been stacked vertically at any ...
3
votes
1answer
176 views

Technical historical books covering the Apollo-Saturn program

In the preface of "Stages to Saturn", the author Robert E. Bilstein writes: This book is a technological history. [...] Two other histories, already published, deal with subjects keyed to ...
4
votes
1answer
345 views

Are there any N1 rockets (the Soviet answer to the Saturn V) still in existence?

Knowing the work that went into the Saturn V, being able to see the size of it in person at the Kennedy Space Center was almost a religious experience. I would love to be able to see an N1. Are there ...
11
votes
1answer
722 views

Vibration and noise during launch of the Saturn V and Spaceshuttle in comparison?

I just saw a TV docu about the Apollo mission. Apollo 8 astronaut William Anders said the vibrations and noise during launch were much heavier than expected. I later heard a speech by the Shuttle ...
1
vote
1answer
216 views

What were the reasons the American space-race era rockets didn't use boosters?

Many families of rockets use booster rockets, most notably the R-7 rockets that the Soviet and later Russians use. In comparison the American space-race era rockets mostly didn't. For example, the ...
6
votes
2answers
2k views

Why a 900,000 gallons LOX storage tank at Launch Complex 39?

At KSC complex 39 there is a 900,000 gallons LOX storage tank. It was used for Apollo Saturn V, the Space Shuttle and lately for the SpaceX Falcon 9 Full Thrust rocket. But why such a large tank for ...
1
vote
1answer
153 views

For F1 rocket engine, why propellant holes were not in proportion to the fuel to oxidizer ratio?

I understand that the F1 rocket engine had (approximately) 1428 Oxidizer holes and (approximately) 1404 Fuel (RP1) holes in the injector plate. Since the Oxidizer to fuel ratio was 2.27:1 for the F1 ...
3
votes
0answers
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 ...
6
votes
1answer
267 views

Did they mount the Apollo Mobile Service Structure (MSS) to the launch pad using nuts and bolts to be prepared for a storm?

The Mobile Service Structure (MSS) was used for every launch preparation of the Saturn V. It was removed some hours before launch. The MSS is the white tower on the left side. The MSS was moved and ...
27
votes
1answer
1k views

How did they access the LM to mount the flag package while the Apollo stack was already on the launch pad?

NASA decided rather late to take a flag to the Moon on the Apollo 11 mission. In fact, they were so late that the package containing the flag was only attached to the leg of the LM on July 9th, two ...
10
votes
2answers
1k views

Is it correct that the Saturn V RP1 tank was pressurized by high pressure helium and the LOX tanks were pressurised by oxygen?

I understand from many sites that in the first stage of the Saturn V, the RP1 tank was pressurized by high pressure Helium tanks, but the LOX tanks were pressurized using gaseous oxygen. Is this ...
49
votes
1answer
4k views

Why is there a Saturn V in the background of this Gemini-Titan launch?

In this photo, a Gemini-Titan is lifting off in the foreground, while a Saturn V is visible in the background. The last Gemini flight was in late 1966, but the first flight of a Saturn V wasn't ...