Hi, top-speed depends on a myriad of different factors. We have clocked the QQ190RTF at 85mph at high-altitude (5500 ft asl) using 1300mah packs and 5040 props- We have found that when trying to achieve top speed, use the smallest battery pack available, and use props that have a good efficiency for top speed.
Let me know if that helps to answer your questions.
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