Reply To: General thought on old coal mines.

The Focus Fusion Society › Forums › Focus Fusion Cafe › FF for Jet Engines? › Reply To: General thought on old coal mines.

January 28, 2011 at 6:28 pm #9535
Tulse
Participant

zapkitty wrote: mach 8-10, which seems to be an optimal velocity to launch to orbit from…

Perhaps I’m not following, but can you clarify what you mean here? Isn’t orbital velocity ~ Mach 25?