What happens when you put a car enthusiast in a box with with a pointy roof for weeks? You get a bored car enthusiast. What does a bored car enthusiast do? Get bored and use a bunch of old Lego sitting around to build a Wankel rotary engine that can be powered by blowing through a tube. Basically in short, a rotary engine is a small but powerful cylindrical engine with a triangular object called the rotor inside. It combusts fuel like a piston engine to spin the rotor around a gear and then pushes the force onto a connected shaft. One of my favourite cars, the Mazda RX8, runs on this bad boy. They can reach up to 230 horsepower and 11000 rpm! A better explanation: https://www.youtube.com/watch?v=pAOtFaMqrRw

The basic idea of my design was to have a (sort of) triangular rotor in the centre attached to a shaft that it could spin on. You couldn't lubricate it with WD40 because that contains acid that dissolves plastics, so it would make a rotary that broke quicker than it was meant to. My engine has to have the rotor perfectly distanced from the other pieces of the shaft or it will lock up and stop performing properly. So far I've ran it with 2 shafts and whilst the first worked better because of its different design, the second is more accurate as it slips around and will cause the engine to explode how it does in real life. The way to power it is via a intake tube you blow through. When you blow through the tube, if the rotor is on the correct angle (50/50) it will begin to spin at a high speed and will also vibrate the entire engine. I learnt my lesson by doing this too much testing it, now my ears are throbbing from the noise and the air loss in my lungs. So far water has been a fine lubricant for the engine and has worked well. Without water, it takes too long to get the rotor up to speed, by then you're out of breath and can't keep going. I'd estimate my rotor reaches up to about 1200 rpm and the shaft reaches about 450. Why the difference? Well to make it sound like a rotary engine, (which goes brap brap brap) the rotor was only loosely attached and not properly fitted to the shaft. This increases the vibration and noise. If anyone wants me too, I can make a schematic for you to follow so you can build it.