Space Forum / Space Flight / September 2006

Supposedly the slingatron is one of the more sound and more thoroughly
reviewed of potential hypervelocity systems, but there are a few
problems I can't figure out a way around.
Suppose you use conventional or gas bearings. The best I've seen is

I'm searching for a technical report written by Levin and Deresh about
40 years ago, the following:
Deresh, D.A., and Paul Levine, "Effect of Collisions on
Skin Echo Enhancement below 90 km," Launch Phase Phenomenology

Has anybody heard of this idea?
http://www.e4engineering.com/Articles/295931/Microwave%20engine%20gets%20a%20boo
st.htm
http://www.e4engineering.com/Articles/266633/Defying%20gravity.htm
How can electromagnetism cause momentum transfer without 2 sets of

Would it be possible to de-orbit a small bit of orbiting debris by
firing a suborbital cloud of oxygen at it? If launched on a suborbital
rocket, a tank of LOX would evaporate into a cloud, which would merely
rise to a maximum altitude and then fall back to Earth. Any orbiting

The rocket launchers are not economical because they
are not reusable. When they reenter the atmosphere,
their slender bodies soak up so much heat from the
ambient atmosphere that they burn up. The Space