ORIGINAL: Popriv
I'm concerned with the outrunner being exposed as I usually fly in a sand pit and the outrunner will land in the sand! (sometimes)
I could bring a can of air and blow it out after landing?
Yes absolutely.
That's a great way of handling things. Take along a few small brushes as well.
Many inrunners still have breather holes which means sand can get into the motor. Because the can is harder to get at, getting sand out can be a big problem.
The exception will be completely closed inrunners, which may be viable for you too...
ORIGINAL: Popriv
Should I be concerned with the sand getting in an outrunner?
You don't want it running with sand within the motor.
However because most outrunners have large cooling holes it can be easy to get sand out.
A can of air and a brush suffices.
The clearance between the motor and the stator is not much so an outrunner can be fouled with just a few grains...
Ideally clean out the motor completely.
There really shouldn't be that much sand getting into your motors, unless you crash and nose in...