MultiWii

is there any possibility to make a copter rain resistant?

i thought about it, bt had no good idea until now.

at least the motors are the problem, because they need cooling air...but shouldnt get wet...

anyone an idea?

Motors do not need any protection just spray some CRC or WD-40 to bearings after flight to avoid corrosion and rust. For other electronics you can use Curver® (water tight plastic box) or similar. You need only seal the wire gland with silicone and then you can use your multicopter as submarine

Interesting idea... If you fly ower the water in rain, you could make some very nice shots.