= Interplanetary Launch =

The launch loop is intended for launch velocities below escape, and vehicles of 5 tonnes or less.  Interplanetary expeditions will require far more velocity and far larger vehicles.  Large interplanetary vehicles will be assembled in orbit from many - perhaps thousands - of 5 tonne components, and fueled for escape (and eventual arrival) with hundreds of additional deliveries of propellant. 

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=== Plume Reentry ===

Interplanetary spacecraft will be assembled in a one-day [[ HEEO ]] [[ HighApogeeConstruction | construction orbit ]], with apogee at 75950 km radius, and perigee at 8378 km radius (2000 km altitude).  A launch loop can launch 5 tonne vehicles and payloads to that high apogee for "kinetic energy cost", proportional to the square of the launch velocity (loop exit velocity added to earth rotation velocity, around 470 m/s at launch loop altitude).

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||<-11> '''Mean Free Path Versus Altitude'''                                                            ||
|| Altitude || Temp<<BR>>erature || Mean<<BR>>Free<<BR>>Path || . . . ||Altitude || Temp<<BR>>erature || Mean<<BR>>Free<<BR>>Path || . . . || Altitude || Temp<<BR>>erature || Mean<<BR>>Free<<BR>>Path ||
|| km       || Kelvin      || km             || || km  || K     || km     || || km   || K     || km     ||
|| 75       || 208.4       || 9.8E-7         || || 180 || 790.1 || 0.12   || || 500  || 999.2 || 77     ||
|| 80       || 198.6       || 4.4E-6         || || 200 || 854.6 || 0.24   || || 550  || 999.7 || 150    ||
|| 90       || 186.9       || 2.4E-5         || || 250 || 941.3 || 0.89   || || 600  || 999.9 || 280            ||
|| 100      || 195.1       || 1.4E-4         || || 300 || 976.0 || 2.6    || || 700  || 1000        || 730            ||
|| 120      || 360.0       || 3.3E-3         || || 350 || 990.1 || 6.7    || || 800  || 1000        || 1400           ||
|| 140      || 559.6       || 1.8E-2         || || 400 || 995.8 || 16     || || 900  || 1000        || 2100           ||
|| 160      || 626.3       || 5.3E-2         || || 450 || 998.2 || 36     || || 1000 || 1000        || 3100           ||