ORIGINAL: w8ye
People come out to the field with a never run engine and if the engine runs pretty good, it goes in the air. That was the break-in, did you miss it?
That's the way.
I just ground run a couple of rich tanks, then fly a slightly rich.
If it starts leaning out, land adjust and take off straight away.
Just listen, if you're not experienced enough to hear the difference, fly with someone that is and ask their advice.
The worse thing that people fear is a dead stick. If the sound of that frightens you, you need to practice.
If you have a decent flight plan/routine work out, a dead stick anywhere won't be a problem... only an annoyance!
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