Launch Loop Stats
2017 March 11
5700 km 

length of rotor 
100 km 

launch path altitude 
0.472 km/s 

Earth rotation speed at altitude 
0.9647 km²/s² 
0.9647 MJ/kg 
Surface to altitude energy difference 
14 km/s 
rotor speed at altitude, not including rotation 

3 kg/m 

rotor density at altitude 
14.074 km/s 

rotor speed at surface 
0.00527 
0.527% 
rotor expansion at surface 
2.985 kg/m 

rotor density at surface 
17e6 kg 

rotor mass 
$6/kg 

estimated cost of electrical steel 
$100M 

cost of rotor electrical steel 
1.7e15 J 
460 GWh 
rotor kinetic energy 
≈ 5.6 days 

energy use in Portland, Oregon 
300 MW 

"maintenance" power and losses 
2600 GWh 

annual maintenance energy 
> 95% 

incremental launch energy efficiency 
1.59 km/s apogee 
10.33 km/s perigee 
GTO transfer orbit ( GEO at 42164 km ) 
9.86 km/s 

launch velocity to GTO minus rotation v. 
50 GJ 

launch energy per tonne to GTO 
$50/MWHr 

WAG estimate, electricity cost 
$700/tonne 

electricity cost per tonne to GTO 
400 tonnes/hr 

maximum launch rate 
3.5e6 tonnes/year 

maximum launch rate 
5.9 GW 

power needed for maximum launch rate 


Saturn V rocket 

3e6 kg 
launch mass 

50 tonnes 
est payload to GTO 
A launch loop rotor weighing as much as 6 Saturn V rockets can launch as much as those six rockets in 45 minutes. Of course, launch loop stationary mass is much larger, including power plants, floats and anchoring cables, turn around magnets, sheathing, etc., but that in turn is much smaller than the construction and power plant mass of Kennedy Space Center.
Apogee insertion motors and surface operations will cost more than the launch energy.
Assume orbiting, reusable rocket motors: if tanked propellant is launched and attached to the insertion motor prior to the payload, the cost of apogee insertion will be the cost of the fuel and tank, manufactured in very high quantities. If the loop launches 80 5 tonne packages per hour, consisting of 60 payload packages and 20 triplefueltank packages, that is 50,000 fuel tanks manufactured per year, not particularly lightweight but sturdy and reliable, which should result in low prices. At 85% learning curve rates, per each, 50,000 tanks should cost 20% of the cost of 50 tanks.