Reactionless propulsion

Support-less propulsion or inertial propulsion is technological concept of a an engine that moves a craft without to use any external body to push from, and without to launch away any its part (as rockets do).

History
The need to push anything in order to cause any movement was recognized well before Christ. The sentence GIVE ME A PLACE TO STAND AND I WILL MOVE THE EARTH is attributed to Archimedes . Since that time, there was not so many documents about the inertial propulsion. The most famous (and, according to the story, successful) intent of the support-less propulsion is attributed to Baron Munchausen . Some projects offer the detailed schemes of the inertial propulsion engines.

Not so many researchers consider the support-less propulsion seriously, if at all. Indeed, such a propulsion contradicts the Frist law of Newton: there exist reference frames (so-called Inertial frame of reference) in which all bodies that are far from other bodies, move straight with constant speed or rest immobile. Traditionally, the Support-less propulsion was considered as a nonsense, as some equivalent of the perpetual motion that contradict the fundamental concepts of physics. Exploring the principle of equivalence of the gravitation and the inertial force, the support-less propulsion can be called also antigravity; the claims on the realization were area of science-fiction, circus illusionists and subject for jokes.

Revival of the inertial propulsion
The interest to the Support-less propulsion was boiled up in the beginning of century XXI in Russia, under condition of so-called "vertikal vlasti" (Transliteration from the Russian вертикаль власти). The superior political power and the ability to eliminate the critical authors makes an impression of power not only over the Laws of the society, but also over the laws of physics. Within first years of the century XXI, several resalizations of the support-less propulsion were reported . The director of the Scientific Research Institute of Space Research and Production, Valery Menshikov was the most successful in getting funds for the inertial propulsion machine. His apparatus called "Gravitsapa" (transliteration from Russian гравицапа) is installed at the satellite "Yubileiny" (transliteration from Russian Юбилейный) and launched 24 May 2008 . First, the claim was to realize the perpetual motion machine, then the claim was reduced to the inertial propulsion . Of order of milliard dollars are estimated to be necessary for such projects .

Ctiricism
The inertial propulsion is developed mainly in Russia for the government's budget. The most of criticism is in Russian . Mainly, the critics is based on the violation of conservation of the momentum and contains the indications that the distributors of the budget not know even the First law of Newton. Up to beginning of year 2010, no official denounce of the projects of the inertial propulsion was issued by the Russian government.