PORRITT•INC
( LAYTON, UT )
ENERGY DEEP DIVE · PROPULSION SYSTEMS AND OFF-WORLD POWER GENERATION

Space &
rocket
energy.

Getting to orbit costs energy that cannot be borrowed from a grid. Every kilogram of propellant is stored chemical energy you have to carry with you — which is why propulsion and power are the same conversation off-world.

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The essentials
TOPIC

Chemical limits

Specific impulse for chemical rockets tops out around 450 seconds. That ceiling shapes every mission profile beyond low Earth orbit.

TOPIC

Nuclear thermal and electric

Roughly double the specific impulse for thermal, ten times for electric at low thrust. The trade is trip time against payload mass.

TOPIC

Power once you arrive

Solar falls off with the square of distance. Past Mars, radioisotope or fission surface power stops being optional.

450 s
Chemical Isp
2×
Nuclear thermal
1/r²
Solar falloff
FISSION
Deep space

Go deeper.

Part of the Porritt Inc. energy library. Questions or corrections are welcome.

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