It seems there is always a new and exciting way to break expectations in Minecraft, and this particular launcher is no exception. Designed some months ago, it remains functional even today, and serves as a viable alternative to gunpowder-fueled launches for Elytra flight.
Fair warning: this launcher will send you ridiculously high in the air! It's far more viable for long-distance travel than any level of precision, but it does excel at that. Enjoy!