Questions tagged [ramjet]

Questions about air breathing jet engines that use forward motion to compress air at the intake, and their forward thrust used to accelerate already non-stationary spacecraft through atmospheres of celestial bodies, or interstellar medium.

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31
votes
6answers
9k views

Why aren't air breathing engines used as small first stages?

I am wondering why we don't use jet engines as first stages. Most small rockets, like the Electron, can lift off with a small thrust. In the Electron's case, 192 kN. Why can't we replace the 9 ...
5
votes
0answers
267 views

What is the difference between “Air-augmented rocket propulsion” and “integral rocket-ramjet propulsion”?

While going through the topic called "Combinations of Ducted Jet Engines and Rocket Engines" in Chapter 1 of Sutton & Biblarz's Rocket Propulsion Elements, 9th Ed I found the section below. Line ...
0
votes
1answer
290 views

Could maglev + scramjet be used to launch rockets to space? [duplicate]

Scramjet technology allows for propulsion once Mach4 is reached, without needing oxidizer thus reducing the weight up to 80% (as read in https://medium.com/@rsn/spacex-falcon-9-vs-isros-reusable-...
2
votes
1answer
229 views

Does the combination of electromagnetics and scramjets offer a viable potential for horizontal-launch?

Most horizontal-launch systems envisioned in the past, that used electromagnetics as a launch-assist, were subsonic. In order to conserve fuel during launch and to keep engine-weight to a minimal a ...
14
votes
2answers
2k views

Why is (conventional) ramjet not used for 2nd stage of rocket propulsion?

Due to nature of space-rocket launches using "conventional" rocket fuel (fuel+oxidizer, e.g. hydrogen+oxygen), every kilo of fuel that has to be carried impacts the rocket's range in a very nonlinear ...
20
votes
1answer
5k views

Why is the SABRE engine curved?

Why is the Reaction Engines Limited SABRE (Synergistic Air-Breathing Rocket Engine) curved along it's length?     Illustration of the SABRE engine with the pre-cooler heat ...
8
votes
1answer
359 views

Any other countries/companies doing anything similar to British Skylon SSTO?

I was reading about the British Skylon SSTO (Single Stage To Orbit) vehicle and its SABRE engine described in Wikipedia. The engine technology looks remarkable, if not revolutionary. Is this a unique ...
10
votes
1answer
1k views

Minimum velocity to achieve fusion with Bussard ramjet

I think that other than in a star, nobody has achieved any fusion process with a net positive energy output. But reading about the Bussard ramjet a few minutes ago, it seems that this might be ...