this post was submitted on 17 May 2026
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Any r/theydidthemath refugees around to calculate the amount of thrust you would receive from something like this?
the questions are the specific impulse of those engines, then Delta-V.
a mentos and coke can reach about 3m height gayser, therefore initial nozzle velocity is 7.67m/s, and a 2l bottle lasts about 2 seconds. resulting in a ISP of 0.7822 seconds.
for comparison, the shuttle solid rocket booster has an isp of 250 seconds, a normal liquid rocket engine is about 450 seconds (the more the better).
plugging in the weights of the Saturn 1, gives a delta V of [drumroll] 18.6 m/s... enough to accelerate a giant rocket to highway speeds.
can we make it bigger to get to orbit? nope, the rocket equation won't let you with that specific implied. sorry
Also, there would be ants everywhere in the vicinity after
Fine, be that way. Maybe we can use it for the little psshhh pshh boosters they use in space on the spacesuits, etc. Don't want to get too technical on you.
ok. but you can only maneuver 3 times before we run out of coke