Why don't swamp coolers push air instead of pulling air? If they pushed air, the fan/motor wouldn't get wet!
I'm designing my own DC, battery-powered, off-grid, swamp cooler for an RV. I'd like to design it so the fan motor is on the outside, followed by the evaporative pad, then connected to the RV window. Essentially the opposite of normal swamp coolers which have the evaporative pad on the outside.
This seems like a no-brainer because your fan/motor won't be operating in the wet/humid air, extending the life of the fan/motor. This is important to me because the DC fan/motor that I'm purchasing is expensive and I'd like to extend it's life as much as possible.
Am I missing some basic physics for why my idea won't work? Or won't work as well as a conventional swamp cooler?