He gets the mass fraction of the chemical rocket wrong ( by 10% ) when talking about mass of the fuel on a rocket. He also has a magnitude error in the distance to the Alpha Centaur ( 10 000 times around the Earth ).
But he does pretty well tell what a MPDT is all about.
Small craft capable to reach orbit and jettison the ” parasite” craft able to move from Earth to Mars…and spread the solar arrays like a sail boat….and get some decent speed increase with minimal weight loss.
These should convince you that at really high speed the space rocket can also be flown like an aeroplane.
Space becomes dence at relativistic speeds.There are 1.8 atoms per 1 cm3 in empty space.
To tell you about the possible top speed of this device you may want to get familiar with the term Oberth effect and gravity assist.
Since the MPDT is able to produce delta-v of 3500 km/s and Oberth effect can multiply this speed 16 fold when passing the sun…then here is the picture to get you familiar with the planetary aligned gravity assist.
In my mind this is the only way to actually reach other star systems.
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