My own fault but.... I was cloud surfing at about 2000 feet and flew though the clouds and killed the motor. It was flying a 2.4 meter motor glider ( FPV flight ) so was able to easily fly back and land a few Ks away. But it showed me that moisture and electric motors don't play well together. Also, when I picked the glider up water poured out the cowl ! Not alot, but enough to make me avoid flying into clouds as fun as it is !