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35 votes

What is the maximum number of times a liquid rocket engine has detonated/ exploded during development?

Since my job at one point in my career was writing a real-time simulation of the Space Shuttle Main Engine so that the Nexus of Evil could fail it in creative ways, I've spend some time studying the ...
Organic Marble's user avatar
8 votes

Rocket engine with lowest Isp to reach orbit

The only French orbital rocket ever flown was the Diamant. In the first configuration (Diamant A), the first stage only had, according to Wikipedia and a document produced by the engine manufacturer, ...
Xx_DrkLeo_xX's user avatar
6 votes

Why did the Soviet Union decide to use 30 small engines instead of a few large ones on the N1?

The N1 was a big disappointment after exploding on every single launch attempt. From what I have read, it seems like most of the attempts went wrong because one of the 30 engines exploded causing a ...
Hobbes's user avatar
  • 128k
6 votes
Accepted

How does a liquid rocket engine prevent the combustion from going back in?

In bi-propellant engines, normally by making sure that full mixing only occurs inside the chamber, using separate injectors for fuel and oxidizer. If doing early combustion to power turbines you only ...
GremlinWranger's user avatar
5 votes
Accepted

Solar Reflective Plasma Drive

Sounds a bit like a solar thermal rocket. Here's a diagram of one from page 49 of Solar Rocket System Concept Analysis. It would use a pair of parabolic reflectors to use sunlight to heat propellant. ...
Starfish Prime's user avatar
5 votes
Accepted

RS-25 Component weight

This is old information from the old (pre-flight) Rockwell document Space Shuttle Main Engine Design Features (BC73-110). However, it is the only document I know of that gives component weights for ...
Organic Marble's user avatar
5 votes

Fueling the RS-25 Turbo pumps?

The easiest way to figure out the fuel used for the turbines and pumps is to base it off of the flow rate of the lean reactant. In the case of both turbines/pumps, that reactant is oxygen. Its flow ...
phil1008's user avatar
  • 6,128
5 votes

Fueling the RS-25 Turbo pumps?

The RS-25 is a staged combustion engine, so the question does not really make sense. Almost all the fuel is sent to the preburners and passes through the high pressure turbines. Much of the oxygen is ...
Organic Marble's user avatar
5 votes

What "unique control system" modulated GOCE's thrust to compensate for variable atmospheric drag? How did it know how to modulate it?

The EO Portal page on GOCE provides a lot of information and references, including for the Drag Free and Attitude Control System (DFACS). It includes this block diagram: (source; credit: Thales ...
Ludo's user avatar
  • 14.4k
3 votes

Did any rockets use differential throttling instead of gimbal?

One company in Washington State called Stoke Space is building a two stage rocket called Nova. They are developing the differential throttle in their Hopper vehicle, which is the second stage of the ...
Cloud Cho's user avatar
  • 149
3 votes
Accepted

Multi-stage combustion products?

Chemical reactions in rocket exhaust often occur in multiple stages and usually involve a number of by-products at some concentration. https://www.nature.com/articles/s41467-020-19497-z/figures/1 In ...
Slarty's user avatar
  • 9,720
3 votes

Why should nozzles be perfectly expanded?

An engine's thrust is transmitted to the rocket via the pressure that the exhaust exerts on the interior surface of the nozzle. Note that this pressure is not uniform: it is very high where the nozzle ...
Charles Staats's user avatar
2 votes

Does electric fuel pumping scale well for rockets?

No. First of all, I don't think electron is at a "sweet spot". In fact, I'd guess that the electric system results in--at best--a neutral result in terms of mass budget, but more likely, a ...
Dragongeek's user avatar
  • 19.2k
2 votes

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

The Rocketdyne F1 engine had a round disk injector. I found this archive of photos. The page with pictures of the F1 injector states it was 44 inches across. link here: http://heroicrelics.org/f-1-...
Rscott54's user avatar
2 votes

How is chamber pressure determined for rocket engines?

The existing answers to this question are quite poor. Chamber pressure is a design choice. While the equations for rocket engine performance can make it seem like chamber pressure is a function of ...
A McKelvy's user avatar
  • 2,492
1 vote
Accepted

Question on improved SSME thrust chamber construction

You're right on the two halves, but they were welded together. The chamber jacket provides the structural strength for the MCC. The jacket is approximately 20 inches long and is formed and machined ...
Organic Marble's user avatar
1 vote

Combustion stability for the second stage of Sea Dragon

The large, low pressure engine proposed for the Sea Dragon second stage was thought to be at low risk of developing combustion instability: The combustion chamber is of conventional design, The 30 (...
Organic Marble's user avatar

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