Space Forum / Space Flight / September 2006

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
bodies to transfer between?

I would have ordinarily dismissed this as hogwash right off the bat,
however I've always considered The Engineer to be an old and
distinguished publication in the field.

What is EM drive? Why should it work, if at all?