O Perdido no Espaço Wiki tem sua resposta aqui:
The spacecraft is propelled by atomic propulsion, using the substance
deutronium as a power source. It also appeared to have an ion drive,
and a magnetic drive. Small rockets came from unknown locations along
the rim of the ship.
Isso também é suportado no Wikipedia página
Especificamente, a página Wiki Lost in Space, anteriormente vinculada, menciona que
it has a radial reactor
No primeiro episódio (desculpas - o vídeo anteriormente não existe mais), você se lembrará de que, em um 'documentário' do navio, somos informados de que o Júpiter 2 era alimentado por motores atômicos, e a mineração de deutrônio é uma razão regular usado na trama por que eles não deixam o planeta em que colidiram.
Decolar
Em termos de decolagem, há o uso de uma unidade antigravidade (ênfase minha):
The anti-gravity drive system was designed for use in vehicle liftoff
and touch down. The anti-gravity drive consumes 250 megawatts at full
power and is capable of delivering up to ten g’s of acceleration. In
terms of the Earth’s gravitational field at sea level, this translates
to 55,000 pounds of thrust. ... Visible light is given off as a
by-product of each revolution of the generated field. The anti-gravity
drive is throttled back when the pull of gravity on the spacecraft is
less than 1/20th of Earth’s gravity at sea level.
...
Full-power launches are characterized by a loud hum of the antigravity
engines, and a glow around the ship caused by the magnetic fields
being generated at the time. Such a launch was used to leave Earth.
Por 'voar por aí'
Quando estão realmente no espaço, eles usam o Deutronium Annihilation Drive:
Deep space propulsion is accomplished with two deutronium-annihilation
atomic motors. Theoretically, these engines are capable of producing
unlimited thrust and speed. Photons are created through deutronium
annihilation in the hafnium carbide reactor chamber located in the
center of the lower region of the spacecraft. The photons radiate
through the urns projecting from the Thompson field projector. These
engines cannot be activated except in deep space. Operation within the
atmosphere of a planet would result in life-threatening contamination
due to dangerous radioactive exhaust.