I found a small 1/5 hp air compressor with 1 gallon tank that would fit in the chest of an android to power the larger body parts.It weighs 16 lbs and could be run by a battery placed in stomach of the android. The air flow would come from the mouth and the compressor noise could be silenced with bafles. I know my first android will not be perfect because of my limited rescources but it will be interesting to see just how good I can do with what I have to work with.