AIR RESISTANCE: influence of motorbikes, bike position etc

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Drones at CX races (and MTB):
Those I've seen have, apart from pre-race course previews, been cable cams rather than drones - i.e. cameras suspended on a system of overhead cables, cable car fashion. The give away is that you get the same moving overhead shots every lap, and occasionally you can see the shadows of the system..
Today you could hear the drones during the actual race.