The thing is, I never worked with drones before. I had to edit lots of recorded footage from drone, but I never had to connect one to video switcher and use it the same way as we use normal cameras. So I don't have any experience. All I know and all I checked is that the video output I get from the drone receiver will match the input settings of my switcher. The director who will work with us, said that there might be delay from the drones and asked me if I can delay the other cameras. He doesn't know how much will be the delay. Also, no one from our crew knows how the drone sends the signal to the ground station - analog, digital, radio, wifi, mobile internet or something else. I think this is important. For example once we had to broadcast live marathon. We had few cameras, but not enough cables, so one of the cameras used transmitter-receiver with few SIM cards for mobile internet. There was like 7 seconds delay on that camera, but it wasn't problem, since there was really long distance between all the cameras and they were showing different parts of the track.
I guess we'll find out on set. But thanks for the good idea, Xtreemtec. I think we may try to use some slowmo footage. The drone may be actually used as some sort of highlight repeater (combined with vmix), since we still don't have repeater in our system. Other than that, our producer (who knows about possible technical troubles), said that the main ground cameras will get detailed view of the bikes and the drones can make...um....forgot the english word - the opposite thing of close up - not so detailed view. Maybe even the whole area. So if there is noticeable delay it may be not visible if the drone doesn't show detailed view (although it might be good to follow some of the bikes or show detailed view of areas that are not well covered by the ground cameras). We'll see