The all new IRIS+ comes with an upgraded motor as well as propellers versus the previous IRIS. While the new 920 kV motor along with the 5100 mAh 3S Lipo provides added lift of IRIS+ over the 850 kV motor of IRIS, this benefit is actually mitigated by the now shorter 9.5×4.5″ propellers. This means that while IRIS+ features a longer flight time than IRIS, the hover throttle (percent of throttle required to hover) is pretty much the same. …