Near-term Applications
A closed loop projectile system could be used for energy storage, similar to a very large flywheel, providing load levelling for terrestrial power grids. If the closed loop were long enough it could even be used for power transmission.
A very small-scale fountain tower could be used for constructing tall antenna masts rapidly, perhaps for news events and military operations. A larger and more permanent fountain tower could be ten or twenty kilometers tall, allowing one facility to provide radio and television broadcasts to enormous areas such as the steppes of Asia. Fountain towers might also prove to be an economical alternative to communication satellites for point-to-point television and FM radio communication between the various islands of some of the smaller nations in the Pacific Ocean. An elevator and observation platform could also be added as a tourist attraction.
Arched fountain structures similar to the launch loop could also have useful small-scale applications, notably the construction of bridges. Projectile-supported fountain bridges could be made arbitrarily long, without the need for support pillars anywhere along their span.
Read more about this topic: Space Fountain