How are you everybody in this forum !! i would like to know if it is possible to take off a small machine from the ground to fly away about 200 or 300 Kilo-grams using other technique rather than differing the pressure of air like the most all air-planes do. My idea was: ------------- Is that possible in physical and mathematical points of view that i can take off an object from the ground to fly up using opposing force against gravity but this force will be calculated just to enable the object to fly up to a specific level high against gravity without using reactors and running in high speed to fly like normal plane or even without vans to be turned around to take the object off from the ground i mean other techniques rather than helicopters or air-planes techniques. To use a force against gravity with specific potential to fly the object up to specific level in air (From the physical and mathematical point of view).