2 solid rocket boosters along with the 3 main engines help this craft, such as the Atlantis, go 3,000 mph
Challenger, Discovery, and Atlantis followed in 1983, 1984 and 1985 ... 
Additionally, two reusable solid rocket boosters provided additional thrust for ... 
Three Space Shuttle Main Engines (SSMEs) were mounted on the orbiter's aft... [DOC] [TLE] Space Shuttle Solid Rocket Booster - Wikipedia [PAR] The Space Shuttle Solid Rocket Boosters (SRBs) were the first solid fuel motors 
to be used for ...