Rockets require an absurd amount of power:
The largest jet engine produces around 100,000 lbs of thrust.
The Raptor engines that SpaceX use produce 600,000 lbs of thrust, and there are ~~9 of them on the falcon and~~ 30+ on starship.
(Edit for the correction there, Falcon uses 9 smaller engines that have around 200,000 lbs thrust each)
The Shuttle solid rocket boosters produce 3,300,000 lbs of thrust each.
Containing that amount of power in a small space where you are trying to make everything as light as possible is very difficult no matter how long you’ve spent working on it.
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