This is an aerospike engine I made. It can go from 0 to 3000 in 3 seconds! When I made a small plane with one of these it went over 20000 mph! Still very adgile. It is very fuel unificiant, so I added a small modded gas tank to the inside, so it has plenty of fuel. If you want to use it without the fuel tank, just take it out,. (It is right inside the front part) I also made a plane with 2 of these, and it went over 20,000 mph in just 30 seconds. It exploded at that point, because of the wings shaking, but it was just accselerating! It also has a really cool exhaust pattern, which took me soooooooo long to finish. To save as a sub assembly, just grab it by the pylon, and it will all come. Please download and upvote, and feel free to use this on your projects, just please cite me as the source! Have a nice day, going 20,000+ mph! Bye!