Harold Ensle wrote:

"Richard" <no_mail_no_spam@yahoo.com> wrote in message
news:c4cfmb$2hsamb$1@ID-153527.news.uni-berlin.de...

[....]

Have you tested it? Has anyone tested it? There can be no recoil from
emission of em radiation.

What century do you live in? Have you heard of compton scattering?
Have you heard of the photo-electric effect?

EM radiation carries momentum and must effect the momentum of
matter it interacts with in order for momentum to be conserved.

Practically it is not valuable as a propellant because, despite moving

the actual momentum exchange is incredibly small.

H.Ellis Ensle

It hasn't been tested. I could be wrong, but from a logical perspective
I feel that I'm correct:
An electron accelerates. Assuming that there are no other particles
within a few meters of it, then how will an emitted photon know which
direction to propagate? From a classical perspective (Maxwell) there
will simply be a perturbation spread out symmetrically wrt the electron.
There thus can be no effect on the electron itself, except perhaps a
slowing down. The momentum, if emitted, must then be cast off in the
forward direction.