less then 20mins of testing 4.1.2.2 , i have revert my andriod back to 4.1.15. to my opinion. by going no OTG will reduce the range . my understanding the chipset that transmit signal eg2.4 ghz & 5.8ghz have a total definite limited power. by sharing to rc + spark , this will sound like Spark will get lesser means less range. it has to be monopoly 1:1 rc to drone itself.