logicalguy wrote:Hmm I wonder if the same can be done with coke and mentos..
Yes, but with reduced thrust I'd think (and no I havn't done the maths, just guessing.)
<pedant>and that would be a rocket rather than a jet, but it's not like the skates would know.</pedant>
Okay, googled a useful looking mentos/coke seems about 2lbs/bottle is your best bet, (turns out hot coke and nozzle shape is the key), and you won't get that for long.
"intial exhaust speed is 22.5-feet per second. That sounds fast but converted to miles per hour it's only 15.3 mph. Still, it accelerates to that velocity in only 0.2 seconds."