newshound wrote:

The Natural Philosopher wrote:

https://www.youtube.com/watch?v=4eFD_Wj6dhk

OK, it's going like a bat out of hell, but it's not clear what the
strategy would be, or how the speed was proved.

radar gun

Are they claiming that speed in level flight?

Apparently it gains speed by looping between two relatively moving air
masses.

http://rcspeeds.com/aircraftdetails?AC=497