Introduction

I was trying to discover possible methods of propulsion that don't require fuel, and the obvious thing was making a forever spinning rotator attached to a propeller made out of slightly angled wings.
However, as I was working on that, I discovered that for some reason when I angled the propeller blades, instead of going faster, the plane was slowing down, so I just fixed the blades with no angle, and this happened.

How to use

To fly, spawn on an airport, activate AG1 and throttle up. DO NOT PITCH up until going fast enough or else you will start bouncing. After you pick up some speed, SLOWLY pitch up. When you are high enough, activate AG2 to drop the booster. Congrats, now you are flying forever. Be careful when flying, do not overcontrol, turn slowly and ascend/descend slowly.
Landing is simple, just slam it onto ground and hit the brakes.
There is no way to stop the props from spinning, but that does not matter as you will read below.
NOTE: yes, it is a tail dragger, I was not bothered to make it look or behave good, it's just a demonstrator god damnit

What is the glitch?

If you look closely, you will notice that the propellers are not angled, so they should not produce any thrust. And they don't - well, technicaly.
If you just stand at the runway with the props spinning, you will not move.
However, as soon as you pick up speed, the propellers will somehow keep the speed even after you detach the booster engine. That is why I call it the "Momentum conservation glitch" (also because it sounds cool).
You can also confirm that the props are not generating any (conventional) thrust while mid-air, if you press AG1 again the props will switch direction, however you will not start slowing down or going backwards.
It also is not possible to take off again after you land (unless you kept the booster attached). This also shows the momentum conservarion.
The glitch basically "locks" the speed of the plane at +/- 200 mph (during a level flight, you can still stall it tho)

Possible explanation

idk lol
No, I believe that for some reason the spinning wings generate lift in a wrong direction, perhaps because of some coding mishap. The wings are not "flat bottom" or "semi-symetric", so that is not the case. If you know why this is happening, please tell me in the comments.
I first thought that maybe the plane is just an amazing glider, so I started without activating the props, only to see the plane plummit to its doom.
Also, obviously you don't need to credit me if you use this glitch (maybe someone has already used it, idk), but pls mention me so I can see what can people do with this.