if you have only a noblex and no backup- horizon s3-pro- and the electric noblex fails your done. when its windy you could have a problem. wind could stop/change rotating-speed of the drum of noblex. that happend to me in helicopter with a noblex pro 150(612-version).
i would buy the newest noblex. its is said to be more reliable(see at their website). i have my doubts the electronic noblex will survive your adventure. ask the owners at panphoto.com. they have a forum.