Pure piston power. This is an experimental plane using an extra small piston engine that can fit in a 2.75x2.75 cowling and drives a contra-rotating propeller to eliminate torque. because of it's small size it doesn't have much power, but it can still speed this plane up to over 270 MPH.

Also the propeller installed is entirely new, and features a positive-negative blade configuration, this just means the airfoils are angled to cut the air and so when the airfoils are set to "flat bottom" the propeller will generate more thrust at the same RPM.

Could this be the smallest piston plane?

-- Instructions --

Start in air, throttle up and VTOL up(Not all the way).

NOTE: When using this engine use it on small planes and don't use more than 2 of these engines(unless you take the cowling off). The problem is that the behaviour of pistons is not only affected by mass, but also by how much fuselage/wing you have in your design. As I'm writing this I have come up with a way to fix this. This will be featured in my next engines.