Treat Her Well, She'll Loop The World For You.
Sylvie was the 5th career aircraft I designed. I first built her because I was desperate; I was almost bankrupt, I couldn't progress, I needed one good mission to break a softlock. Sylvie outperformed the aircraft I was trying to build in the same role it was meant to serve.
She can fly for a VERY long time if you know what to do. Once you get really good, and if you have a good start, you could probably fly for days in a row if you had the time and skill. Fly under daylight if you can (Solar power, shockingly efficient), carry fuel for the fuel cells on long flights just in case it gets dark.
You can delete the markings from my playthrough and replace them as you progress yourself. Or, you can leave them as a reminder that you can do such things, too.
Enjoy.
Also at part properties you can change blade pitch to -37 so even if the motor is facing backwards the plane still flts forwards