several years ago i was messing around with those little ones sold at wal-mart- lipo powered air hogs? I would cut the foam bodies in half, lighten-re shape- reshape the ends of the blades -they would spin higher rpm. the control-transmitter is infrared- will not work good in bright sunlight. on cloudy days with no wind- go outdoors and see how high they would go- one would go about the height of a high power power line- the big metal towers- could hardly see the thing! I did fly in the front room --- until i nearly smacked a stereo speaker called a magnaplaner- thes guys are NOT cheap. Still have 3 of these birds in a box somewhere, should fly in the basement this winter.