https://brilliant.org/CuriousDroid Over 50 years ago an engine was designed that overcame the inherent design inefficiencies of bell-shaped rocket nozzles, but despite much research in the 60's, 70's and 90's and was to power the replacement for the Space Shuttle. But 50 years on and it still yet to be flight tested. So why aren't we using Aerospike rocket engines? This video is sponsored by https://brilliant.org/curiousdroid The first 200 people to apply will get a 20% discount on their yearly Brilliant subscription. Presented by Paul Shillito Written and researched by Paul Shillito Intro music by Mike Mullen BMI www.positrosmic.com Footage and Images - NASA, SpaceX, Rocketdyne, Lockheed Martin This episodes shirt is the Madcap England Wallflower - available here https://www.madcapengland.com/product/30339/mens-mod-rayon-fabric-vintage-shirt-white.