with a few lego parts gearboxes and not lego machine i made it so i can reach the speed of light i cant send a picture rn tho

I always make lego robots and code them :)

coding is hard for me i make model engine like F4 V8 V10 W16 V16 F6 I4 and stuff like that and then i test it out with high speed machined in my house (aka working tools) and most of them explode other ones work perfectly

Ok so theoretically you can make something that "could" accelerate past the speed of sound using gears BUT the amount of force required to turn that would be impossible for any current human technology, not even the force of the blast off of apollo 11 couldn't budge that.