ToughSF on Twitter: "A liquid fuel ramrocket can reach Isp double that of even the best hydrolox propellants. It is very effective when used to accelerate a spaceplane through the atmosphere. However,
![Cheaper space launch $500/kg or less: Ram accelerator, magnetic launch and plasma hypersonic | NextBigFuture.com Cheaper space launch $500/kg or less: Ram accelerator, magnetic launch and plasma hypersonic | NextBigFuture.com](http://farm2.static.flickr.com/1240/1046415757_f7e4174845_o.jpg)
Cheaper space launch $500/kg or less: Ram accelerator, magnetic launch and plasma hypersonic | NextBigFuture.com
![What is the difference between "Air-augmented rocket propulsion" and "integral rocket-ramjet propulsion"? - Space Exploration Stack Exchange What is the difference between "Air-augmented rocket propulsion" and "integral rocket-ramjet propulsion"? - Space Exploration Stack Exchange](https://i.stack.imgur.com/YmMoO.png)
What is the difference between "Air-augmented rocket propulsion" and "integral rocket-ramjet propulsion"? - Space Exploration Stack Exchange
![AREA-51 IS THE HOME OF AMERICA'S NUCLEAR AERO-SPACE PROGRAM: DID THE SR-71 HAVE A THIRD RAM ROCKET ENGINE OR A RAM-ROCKET VARIANT? AREA-51 IS THE HOME OF AMERICA'S NUCLEAR AERO-SPACE PROGRAM: DID THE SR-71 HAVE A THIRD RAM ROCKET ENGINE OR A RAM-ROCKET VARIANT?](http://4.bp.blogspot.com/-TP7iNyAHYG0/VihvogUYjHI/AAAAAAAAHgs/orOQmvNBH-Y/s1600/RAM%2BROCKET.jpg)
AREA-51 IS THE HOME OF AMERICA'S NUCLEAR AERO-SPACE PROGRAM: DID THE SR-71 HAVE A THIRD RAM ROCKET ENGINE OR A RAM-ROCKET VARIANT?
Analysis of rocket, ram-jet, and turbojet engines for supersonic propulsion of long-range missiles 1: rocket-engine performance - UNT Digital Library
![Unified Analysis of Internal Flowfield in an Integrated Rocket Ramjet Engine. I: Transition from Rocket Booster to Ramjet Sustainer | Journal of Aerospace Engineering | Vol 27, No 2 Unified Analysis of Internal Flowfield in an Integrated Rocket Ramjet Engine. I: Transition from Rocket Booster to Ramjet Sustainer | Journal of Aerospace Engineering | Vol 27, No 2](https://ascelibrary.org/cms/asset/e99774d6-8226-4a95-a91e-bd5389295faa/figure1.jpg)