Urgent Question about "Rain Removal System" As far as I know, every big civil-craft will have 2 rain removal system: one is the "Wiper system" and the other will be either of the following: 1 Rain Repellent System 2 Pneumatic Rain-Removal System 3 Hydrophobic Coating Since there is not much comparison literature, I wonder how to evaluate the 3 sub-system for a long huge Aircraft operated under pacific weather(which mean have rain season annually). and is there any difference for a short huge plane in same situation? Thanks for your opinion and your kind help. p.s. I know the basic principle of those system.