Giant, Very Good Glider. Pulls About 2g. This Aircraft Is Intended For Long Distance, Low Power Flight. I Estimate That It Can Circle Kerbin In Atmosphere About 1 And A Half Times. And It Is Mostly For Crew Transport (Up To 3 Pilots) And Science, Just Give It The Instruments.
The Higher Up You Go, The Less Speed And Fuel Usage Due To The RAPIER Engines Shutting Down, And Although This Sounds Bad, Squad Must've Made A System To Logically Shut Down Engine Clusters Like This One To Prevent Asymmetric Thrust.