1.introduction
On the pages of this site
you can become acquainted with the article, in which proved the
possibility of the realization of "reactionless" displacement in
complete agreement with the laws of conservation .
By "reactionless displacement", is implied the displacement of the closed mechanical
system only due to the internal forces.
Varipend 
Are given two solutions of the
task presented.
The first solution rests on the law of momentum conservation.
Second solution  with the aid of the Lagrange's equations.
Are given recommendations regarding the possible realization of stated
task
and solution proposed.
Article it is possible also
to download'
in size PDF.
Difference in the article in size PDF  only in the absence of animation.
(which greatly would be recommended to look!)
The name of site  "varipend"  is created from the confluence of two words
"variable + pendulum".
The author is grateful to all for their constructive comments.
The many thanks!
Butov
S.V.
Additional references:
article
"NonJet Movement"
One
additional solution of this task.
If we consider the missile and rocket fuel combustion products as a
single mechanical system, the center of mass of the system remains
unchanged position. (In the frame of reference related to the point
of launch rockets.)
This is proven and is not subject to any doubt. In the article "NonJet
Movement" shows that for a system in which components are separated
from the finite radius of the centrifuge, the center of mass system
as a whole changes its position in space. In full accordance with
the law of conservation of momentum and energy conservation law.
A numerical calculation in the computer algebra system Maple..
article
"Analogy
between rotatory and forward motions "
Using
an analog method, it can be assumed that must exist the closed
mechanical system, capable of changing its attitude only with the aid
of the internal forces, without the action from external.
