Last week I finally did the first submersion test of the frame, motors, and electronics housings. There were no actual electronics on board apart from the potted ESC board. The goal was to see if anything leaked.

Fortunately I have a hot tub in my back yard, so the test just involved taking off the lids, and popping the frame into the warm water.

First - nothing leaks! I'm ridiculously happy about this. Hardly a pressure test, but a success. Second - when you put closed tubes of air on 100 degree water, the air warms up and threatens to push the tube ends out. Thankfully that didn't happen, and obviously not a problem underwater. Third - I need to clean the hot tub! I don't think it's suppose to be that color.