My 3 speed gearbox powered by my 6000+ RPM Lego turbine vacuum engine

I’d like to introduce to you my 6000+ RPM (Revolutions Per Minute) turbine engine. I first constructed 4 airtight walls around the base with 2 openings opposite to each other. One of the openings would be for an exhaust with a valve and the other opening for the vacuum’s entry. Next I made a 4×4 turbine blade attached to an axle for the output. After many test runs I found that their were many areas where air would turn static so I used slopes inside the engine to make sure the interior was completely flushed. For the gearbox I used a 1:1 with 12×12 teeth gears for the first gear, a 1.33:1 with 16×12 teeth gears for the second gear, and a 1:1.67 with a 20×12 teeth gears for the third. Each gear change would allow me to increase the output’s speed just like in a manual transmission car. Finally I add my flywheel to carry out my engines energy while running and connect the engine and transmission to each other using 2 universal joints Lego provides in their technic sets.

To start the engine I connect the vacuum’s tube to the designated opening in the engine and spin the flywheel to give the turbine a startup. I would then use the exhaust valve’s lever to give the engine some throttle as it would allow more air into the engine for the turbine to work with, this would double the RPM and help get to the top speed for each gear until it’s time to change selected gear. My goal for this engine was to make it like none other and keep it as compact as possible while reaching exceedingly high RPM, especially with a loud roaring exhaust.