Any attempt to travel long distances in space, mars or beyond we must uses a propellantless engine, however up to very recently it has been considered impossible.
In the next few paragraphs I will describe a working propellentless engine (fluid space drive) or if you prefer you can read how David Hambling describes the proposal here: http://www.wjetech.cl/law.htm
The proposal can be tested with materials available in most physics classrooms, see here: http://wjetech.cl/ssxx.html
Simple description of the FDS
(You can see with illustrations here: http://www.wjetech.cl/u/ )
Visualize a cylinder shaped spaceship in 0G, point it in the direction you wish to travel (mars or Alpha Centauri according to your ambitions).
Position at the inner rear end of the spacecraft a mass (let us say 100k), and give that mass a strong push (let us say 100n force) against the spacecraft’s rear inner wall, this will result in two actions:
One: the 100k mass will be hurled forward inside the spacecraft with a 1mps velocity.
(V=F/M = 100n/100k = 1mps)
Two: the spacecraft itself will gain velocity in the backward direction (away from mars).
For a few moments spacecraft and 100k mass will travel in opposite directions until the 100k mass collides with the spacecraft’s inner forward wall.
As the mass’s velocity is unchanged (1mps) it will excrete identical force (F = M x V = 100k x 1mps = 100n force) forward against the spacecraft and it will stop (no final velocity change).
So far so good, no need to worry, the laws of physics remain sacrosanct.
Next we give the 100k mass a 100n push against the spaceship’s front inner wall, once again this will result in two actions:
One: the 100k mass will be hurled backwards inside the spacecraft with a 1mps velocity.
(V=F/M = 100n/100k = 1mps)
Two: the spacecraft itself will gain velocity in the forward direction (mars, here we come)
Here is the fun part, as the 100k mass is traveling towards the spacecraft’s rear wall, an air brake (small parachute) is deployed slowing the 100k mass’s relative velocity in the “backwards direction”
NOTE: the cylinder must be of sufficient width so the air brake does not act as a piston (see illustrations)
When the 100k mass collides with the spacecraft’s rear inner wall, it does so with a velocity that is LESS than 1mps (it was slowed by the air brake) therefore the resulting force in against the spacecraft is less than 100n, and not enough to bring the spacecraft to a “stop”, it will still have a forward velocity increment.
The cycle can be repeated indefinably.
This is where we can have a long argument about the behavior of gases, turbulent/laminar flows, conservation of linear momentum etcetera.
But (as mentioned earlier) the proposal can be easily tested with materials available in most physics classrooms, see here: http://wjetech.cl/ssxx.html
I hope you can give the proposal a thought, it will prove to be immensely useful.
I will be very grateful if you share this mail with as many personas as possible.
(I am the inventor of the FSD trying to share the idea)