I broke the land speed record- 463 m/s, BUT without monopropellant engines, mods, according to the rules of the Trust KSC Challenge which is a closed thread. However, the challenge is really hard if you look at the rules, but I did it!. Check out my video on YouTube, I just started the channel, so it would be really helpful if you tell me what to improve in my video, but don't be too much judgemental! Here's the link---https://www.youtube.com/watch?v=_UL7eQtG2PU Thanks.