Weeeellll, this is the place not to post about doing a liquid propellant lox or otherwise motor aside from hybrids.Not a troll, just someone who has an ambitious idea and no idea of the actual complexity involved. You see them a lot more in other rocketry communities that young people will tend to find before TRF. I typically see them either trying to build a TVC rocket, after seeing a few BPS.space videos, or making super sketchy sugar motors after seeing the a YouTube video with absolutely horrible instructions on how to build them.
Unless there is an imminent safety risk, like with a poorly designed and built sugar motor that they intend to light with a fuse and stand 10 feet away, I generally prefer to nudge them towards NAR and Tripoli clubs. I know of several teenagers who showed up in various online rocketry communities with various terrible motors who now have Jr. L1 certs and are working on interesting projects with experienced mentors.
If working on liquids, keep it within the academic institution(s) one is attending with their advising Professor(s), Phd's or otherwise.
Likely there will be "patent" issues involved on some "new and improved" liquid propellant and all will be sworn to secrecy. Last I heard, they got to the epitome of propellant with LOX and liquid hydrogen. A "beech" to deal with and some folks used "stuff" with less impulse but could get by with. Was a lot safer too. Especially the solids. Kurt