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399 MPH Glider?

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dynamic soaring glider 399 MPH Glider?There’s a technique called dynamic soaring that birds particularly Albatrosses use to harvest energy from places where winds are changing such as in wave troughs.

Gliders use the same technique and radio controlled gliders in this video, to get up to a speed according to the radar gun of 399 MPH. Call me a little skeptical but are model gliders structurally able to go that fast without over stressing the wings? Certainly one or two of the comments suggest the same. Anyway you make your mind up!

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