How, if UFOs are there, can fly, Vimana Shastra.

UFO's Mercury Vortex Engine.
UFO stands for Unidentified Flying Object.This term was actually, UFOB, created in 1953 by Unite States Air Force. It was to classify any such aerodynamics in action which does not come under the categories of machinery used for flying by man. We have all propeller based flying machine. But UFO have some different kind of engine. As explained in the, Vimana Shastra of India, which have proper plan of building flying machine thousands of years ago, used mercury vortex engine. It used mercury as fuel. Hitler has used such technologies with the help of Subhas Chandra Bose. He gave him the idea of such flying machines which could be made. In India, they were kept hidden somewhere so that it does not go into the hands of bad people.Viman Shastra has documented the plan of building flying machines.In Indian mythology, there is presence of flying technology. Lord Vishnu had his flying machine. In fact all of the famous people in the mythology of India had their own flying machine like today's private jets.They had mercury vortex technology fitted in them. 

This video explains the working of mercury vortex engine.

 

The sudden downward movement of this big iron cylindrical rod pushes back with the same intensity in which it goes down, which makes it to go up, when many of these engines are attached to a cabinet and rotates very fast, the cabinet starts to fly towards the sky. These are not propeller based technology but something very clever and technologically advanced. The way the vortex engine is designed is remarkable. It is pure intelligence.