The radio operator reported one moving at 138 knots which is approx 160mph. The DRL RacerX has recorded speeds over 163.5 mp getting a guiness world record, although this was indoors.
Once you go to fixed wing, 138 knots is pretty simple. Just look at the list of unmanned aerial vehicles - it's big and dominated by fixed wing aircraft. https://en.wikipedia.org/wiki/List_of_unmanned_aerial_vehicl...