2 solid rocket boosters along with the 3 main engines help this craft, such as the Atlantis, go 3,000 mph
The three Space Shuttle Main Engines, in conjunction with the Solid Rocket 
Boosters, provide the ... After the solid rockets are jettisoned, the main engines 
provide thrust which accelerates the Shuttle from 4,828 kilometers per hour (
3,000 mph) to over 27,358 kilometers per hour (17,000 mph) in just six... [DOC] [TLE] RS-25 | Rocketology: NASA's Space Launch System | Page 2 [PAR] Jan 25, 2016 ...