Suppose in the near future we send an Antimatter rocket that is capable of constant $1g$ acceleration to our nearest star, Alpha Centauri, $4.3$ light years away and suppose we want the spacecraft to reach the destination in the shortest time possible. This means the spacecraft will accelerate at $1g$ to the half way point and then decelerate at $1g$ for the rest of the journey.
Using Newtonian mechanics I have found that the entire journey will take $4$ years as measured from Earth with a maximum velocity of $v_{max}=6.31*10^8 ms^{-1}$ ($2.1c$ - faster than speed of light) at the midpoint. However, nothing can travel faster than the speed of light so applying the formula $$v(t)=\frac{at}{\sqrt{1+\frac{a^2t^2}{c^2}}},$$ where $v(t)$ is the velocity at time $t$, $a$ is the acceleration of $1g$ and $t$ is the time as measured from Earth to the model, I get a maximum velocity of $v_{max}=2.7*10^8$ ($0.9c$).
What if we are in the rocket? Our destination will appear closer to us due to length contraction, not only that, but because of time dilation, our journey will take even less time.
1) How do I apply length contraction and time dilation to the model?
2) Are there any other special relativity effects that I should implement into the model?
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