I was experimenting with propellers by XML editing it by changing the power, diameter and other stuff, i test it, the craft reach about 700 mph, then it goes light speed and everything goes black. The craft reaches 0 mph and 0 ft. I tried to change locations, but there is a text on the top that says xdddxdxdxd.
Can anyone explain?
@SimpleEngineering 
I think it means it has too much power, unsure but I think I’ve heard of the xxdddxdx thing before
I have the screenshot, i just dont know how to post the screenshot.