The craft will have four Jet engines, I plan to use four Pules jet engines. The engines will be mounted rotary props that will be gyroscopic balanced in a way that the thrusters always face downward on each corner of a large 30x30 square structure (doesnt have to be 30x30 just big enough so that each engine can stableize the craft effecantly), this is necessary because it gives each engine its own center of gravity, in addition a single weight will be placed in the center of this square structure so that the whole craft will level it self, this along with the rotary engine mounts provide a super stable structure for a hovering vtol platform.
The way the craft will hover, is by using a timed fuel injection system. Pulse engines run a full power at start, and stay at full power as long as it has fuel to ignite.
I want a computer to create a virtual surface, and know how high each engine is from the surface. Then this is where the timed fuel injection takes place. I want the thruster to "only" inject" fuel is the engine is under a certain height, so that when a engine is above a height it will shut off and essential stall and fall back to the designed height.
This is also how lock-heeds multiple kill vehicle hovers You can watch a video here Lockheed Martin's Multiple Kill Vehicle (OLD) - YouTube With the altitude timed fuel injection system you can also control the pitch and roll of this craft, and by turning the props independently you can achieve maneuvering yaw, forward backward ect.
Also to note, the gyroscopes will be simulated and a motor in the rotary props will correct its position, all this requires is computers, motors, pulse engines, and lightweight materials. That is why I choose pulse engines they have almost no moving parts and have a high thrust to weight ratio. of course it would all have to be perfectly calculated and lets not forget our fuel. All in all I believe this is feasible for any flight hobbyist. a easy and simple project. I have also tested this in simulation I plan to make a video soon to demonstration.
NOTE: Does not have to have rotary engines, fixed engines are fine, but require thrust vectoring in order to achieve sufficient maneuver abilitys such as turning.
Also by increasing/decreasing thrust in the each engines, you can pitch and roll; example increasing the two front engines well the engines in back decrease you can move the craft backwards and achieve pitch same with roll. Turning can be achieved by using counter thrust like tanks use treads to turn, one side goes one way and the other goes the opposite way.
I believe that the mass production of helicopters has created a VTOL ideology and has blurred the VTOL Flight possibility's.
REVISIT | UPDATE:
From the WATER AND TILT ROTORS THREAD
So I was thinking about deconstructing this sci-fi drop ship in a video and figuring out how it all works
The aircraft is a vtol and uses four tilt props on each corner of the vehicle like a quad tilt rotor, the rotary prop houses two engines, probobly pulse jet engines, one aiming down [vtol], and the other aiming behind for thrust. it is encased in a aerodynamic winglet thingy with two fins at the end of this rotary prop.
So this thread is not about the craft, it is about how the tilt props can "tilt" the entire prop with engines fins, everything is I would assume at least around 10 tons. So what if there was water involved in the tilting? Water is incompressible right, and with that lets imagine 4 square containers (for visualization purposes) lets fill them all with water, now between the top and bottom parts is a long thick sheet of metal with a rotary between the 4 containers. Because there is equal amount of water on both sides and no leaking and all is completely pressurized, not other gasses basically a vacuum with water. ect. the sheet of steel should stay in the same place. now lets drain 1.0 amount of water on the left bottom volume, it now has a pocket of vacuum, now at the same time we drain the bottom left volume we drain 1.0 of water on the top right volume. so now the sheet of steel should be 5 degrees tilted.
you should get the idea now.
(Note: all of this is not a design, it is a simple physics concept that can possibly be used for tilt rotors.)
I don't know if this would be effective in real life but seems like it would be. I am curious to know any machines that use this method for moving massive objects or heavy objects.
edit: The scifi drop ship I was talking about.
D77-TC Pelican - Halo Nation4