Understanding How the Raptor Rocket Engine Works! The Terran Space Academy walks you through the design and components of the amazing full-flow staged combustion Raptor rocket engine! Extra Credit: https://arc.aiaa.org/doi/full/10.2514/1.B38037 Shop the Academy store at... https://shop.spreadshirt.com/terran-space-academy Please help support our channel at... https://www.patreon.com/terranspaceacademy Thank you so much for watching! Ad Astra Pro Terra Artists https://twitter.com/C_Bass3d https://twitter.com/LabPadre https://twitter.com/Neopork85 https://twitter.com/hazegrayart https://twitter.com/AlexSvanArt https://twitter.com/_fragomatik_ https://twitter.com/nickhenning3d https://twitter.com/RGVaerialphotos Companies https://twitter.com/NASA https://twitter.com/SpaceX https://www.cochranex.com https://twitter.com/blueorigin https://twitter.com/Space_Ryde https://twitter.com/VirginGalactic https://twitter.com/relativityspace https://twitter.com/NeutronStarSys Music Credits Lost Frontier by Kevin MacLeod is licensed under a Creative Commons Attribution 4.0 license. https://creativecommons.org/licenses/by/4.0/ Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1300039 Artist: http://incompetech.com/ ... https://www.youtube.com/watch?v=5FjUv-VNcPg

China is on track with its three-phase plan to have a lunar base by the 2030s, while NASA's Bill Nelson has said the US will do the same by the 2040s. The United States has become so complacent that we don't even appoint knowledgeable people to powerful positions any longer. If China controls cis-lunar space, how likely is it that American or European spacecraft will get clearance to land? Let's look at China's progress on their International Lunar Research Station, and listen to the latest brilliant exchange between American politicians. Shop the Academy store at... https://shop.spreadshirt.com/terran-space-academy Please help support our channel at... https://www.patreon.com/terranspaceacademy Thank you so much for watching! Ad Astra Pro Terra Artists https://twitter.com/C_Bass3d https://twitter.com/LabPadre https://twitter.com/Neopork85 https://twitter.com/hazegrayart https://twitter.com/AlexSvanArt https://twitter.com/_fragomatik_ https://twitter.com/nickhenning3d https://twitter.com/RGVaerialphotos Companies https://twitter.com/NASA https://twitter.com/SpaceX https://www.cochranex.com https://twitter.com/blueorigin https://twitter.com/Space_Ryde https://twitter.com/VirginGalactic https://twitter.com/relativityspace https://twitter.com/NeutronStarSys Credits ESA ULA NASA CNSA SpaceX ... https://www.youtube.com/watch?v=l-fkL8oUPBo

The Starship is the most innovative spacecraft ever conceived. The Terran Space Academy provides an in depth analysis of the technology behind the Starship, to see if we had the technology to do this almost half a century ago, analyzing the closest analog produced by NASA. Comparing available rocket engines and fuels with a lesson on vacuum optimization, hydrogen energy production and efficiency, and methane fuel cells. ------------ Excerpt ------------ Could the second stage of the Saturn V been modified to have flown like the Starship? And come back to land? Re-landing a spaceship is not easy. The Saturn V 2nd stage was called the S II. It was hydrogen powered. The only reusable hydrogen powered rocket flying today is the New Shepard by Blue Origin. The New Shepard is not a large spacecraft, but it does reach the von Karman line. Here you see it in action… And here you see the landing legs deploying. The New Shepard works well for suborbital flight, but it is quite small with, a mass of only 20,500 kg without fuel, and about 75,000 kg with fuel, according to Astronautix. The Starship is much larger than the New Shephard. At 50 meters in height and 18 meters in diameter with a gross mass 1,320,000 kg it is the largest second stage ever built and is more than 17 times the mass of New Shepard. There is no real comparison between these two. But the Saturn V second stage, built by North American Aviation, had a height of about 25 meters and a diameter of 20 meters. It had a dry mass of 36,200 kg and could hold 443,000 kg of propellant with a total gross mass of about 480,000 kg. It was called the S II and we’ll refer to it that way. At more than one third the mass of the Starship we can start comparing these. The S II had 5 of these hydrolox engines called the Rocketdyne J-2 with a vacuum thrust of 1,033 kilonewtons each and a specific impulse of 421 seconds in vacuum. Pause for a second. The BE-3 hydrolox engine used by Blue Origin on the New Shephard has a thrust of 490 kilonewtons and a vacuum thrust of 710kn. This does not seem like a great improvement. It can be throttled down to just 89kn which is good for landing. And vacuum thrust and efficiency is not sea level thrust and efficiency. Some sources report the sea level efficiency of the J2 to be only 200 seconds while the vacuum is 421 seconds. I found this hard to believe but when I double checked my equations showing force (1,033N) divided by ejection velocity (Is*g=421sec*9.81m/s^2) equals mass fuel flow (250kg/s). Then assuming the same fuel flow at sea level takeoff with the thrust given by Rocketdyne at sea level of 486kN. Dividing this by the same fuel flow we get 198 seconds. This shows that vacuum optimized engines don’t work well at sea level. But the J2 was ... https://www.youtube.com/watch?v=5zBg6lwj1_8

Terran R beats Falcon 9! The Terran Space Academy evaluates the Terran R rocket to be built by Relativity Space, and compares it to the SpaceX Falcon 9, showing that when it comes to mass to LEO and reusability, the Terran R will be a better rocket system. Shop the Academy store at... https://shop.spreadshirt.com/terran-space-academy Please help support our channel at... https://www.patreon.com/terranspaceacademy Thank you so much for watching! Ad Astra Pro Terra Credits Ulysse Carion for the DeltaV Subway Map SpaceX, Relativity Space, NASA and the Glenn Research Center Artists https://twitter.com/C_Bass3d https://twitter.com/Neopork85 https://twitter.com/hazegrayart https://twitter.com/AlexSvanArt https://twitter.com/_fragomatik_ https://twitter.com/nickhenning3d https://twitter.com/RGVaerialphotos Companies https://twitter.com/NASA https://twitter.com/SpaceX https://twitter.com/blueorigin https://twitter.com/Space_Ryde https://twitter.com/VirginGalactic https://twitter.com/RelativitySpace https://twitter.com/NeutronStarSys ... https://www.youtube.com/watch?v=sWhqNmJiufc