⇤ ← Revision 1 as of 20160725 05:24:21
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Deletions are marked like this.  Additions are marked like this. 
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  radius km  launch V  kick V     radius km  launch V  kick V  
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Saving perhaps 200 m/s of delta V on a Mars rocket launch is significant. Not for a launch loop. It is more important to save delta V for the kick. 
Launch Loop Destinations
Launch at 80 km altitude, 6458 km radius. GM is 3.986e14 m^{2}/s^{2}, day is 86164 seconds, escape velocity is 11111 m/s. rotation velocity 471 m/s, effective escape 10640 m/s . Not including air drag on the way out, which will be significant.

radius km 
launch V 
kick V 

ISS 
6780 km 
7480 m/s 
94 m/s 
inclination 51.65°, inaccessable from equatorial plane launch 
M288 
12789 km 
8586 m/s 
1009 m/s 

GEO 
42164 km 
9875 m/s 
1490 m/s 

Moon 
384400 km 
10547 m/s 
833 m/s 
Moon's orbit inclined compared to Earth's axial tilt 
Mars 

11002 m/s 
5630 m/s 
sum of squares, eff. escape + 2.86 m/s 
Note that gravity assist from the Moon reduce the Mars launch velocity a tiny bit  but not much, because the vehicle must leave the Moon at precisely the right direction (tangential to Earth's orbit) and velocity ( 2860 m/s added to the Earth's 29,800 m/s solar orbital velocity to be in a Hohmann orbit to Mars, and this must happen at precisely the right window to reach Mars when it gets there. These windows happen every 780 days, and the Moon will be in the wrong place most of those days. The vehicle can take a faster orbit than a Hohmann (with a higher delta V at each end) and accomodate some "wrongness") but not much.
Saving perhaps 200 m/s of delta V on a Mars rocket launch is significant. Not for a launch loop. It is more important to save delta V for the kick.