Apparently, this user prefers to keep an air of mystery about them.
16 Why was the Shuttle's LOX tank on top of the LH2 tank, since that makes it more top-heavy? Jan 14 '14
6 Would a Centrifugal Battery have a distinct advantage or disadvantage in zero or low gravity? Jun 11 '14
6 Could I home-brew my own rocket fuel? Feb 25 '14
4 Can a launch-provider determine from the flight-profile whether the payload will be in the wrong orbit? Aug 25 '14