if you guys want to know tyrannosaurus Rex was the fastest with the time of 21 seconds

not @Hasty at all!

You can use a jet engine that points down, it gives more grip. and launch. And if the bouncing becomes an issue, try using hip suspention.

Dreadnoughtus was so fun to watch, taking its sweet time.

Dreadnoughtus is like trying to walk a kerbal many kilometers across the Mun's surface after you stranded them on your first manned landing.