well it's a pretty simple concept, I've come up with plenty of power enhancing features, but most importantly, it needs NO FUEL and can run forever, as long as there isn't any physical damage to the engine, even then they tend to run even when missing parts. now about the name of this thing 41CBU2 The 41CB indicates how many Airbrakes there are in total, CB standing for Cubic Blocks U indicating that the engine is designed to run upside down.And 2 indicating that it's a 2 stroke engine, meaning that it has 2 power strokes as opposed to one.This guy works best and was fully developed on medium physics, but should work fine on high. It does require quite a machine to run, but my S8 ran it fine.------CONTROLS-------AG 8 are for ignitionBoth VTOL and TRIM are for wheel clutches. ----------OPERATION------------very simple and easy to use, but it can get even better with a few tipsDon't run the engine at 100% the entire time:Doing this can cause damage to the Connecting rod, piston, and Airbrakes. This engine has not been load tested for RPM, it has only been tested for low end torque.It's S L O W.This isn't a car, it's a tractor, it's meant to pull heavy loads up steep grades.--------------SPECS---------------Top speed:16MPHBest speed: 7-12 MPH(for continuous load)Max engine RPM:N/ARecommend Service Throttle: 87-95%Low Idle Throttle: 7%High Idle throttle:10%