Cessna Skyhawk (N8EW)

Race: Formula One Heat 1A; 2019 National Championship Air Races.
Bottom: N8EW "The Kraken" ("Race 3"), Pilot Ross Killin, Melbourne, Australia.
Top: N6291N "Last Lap Player" ("Race 15"), Pilot Ryszard Zadrow, Waller, Texas.
Photo #4 in a sequence of 6 photos taken within two seconds (#7 in a sequence of 11 total photos), and first of five total post-collision.
Both racers were turning Pylon 5 (Formula One Course). The propeller of Race 15 struck the right wingtip area of Race 3. (Photo #6 in my 11-pic sequence shows both racers about one-quarter of a second pre-contact.) This photo, fired within the same single second as my previous shot in the sequence, shows the debris flying away from Race 3, and pilot Killen going vertical as he banks away from Race 15 -- most likely, still in the act of banking around the pylon. At this instant, neither pilot has had an opportunity to declare and, in all probability, Killen may not yet have even fully understood exactly what has happened to his racer because he would have been concentrating on getting around the outside of Pylon 5 and may not have even known that Race 15 was only a couple of feet behind his right wing. Zadrow, piloting Race 15, would probably have seen his prop strike Killen's wingtip but it is doubtful he would have even fully fathomed the strike when this pic was clicked.
* NOTE ... This photo is a very small section of a much larger original. I cropped this portion out of the larger original so that the detail is easier to view. However, by doing so, it makes it appear that the two aircraft are rather far apart from each other. In reality (as is obvious in the original), they are literally directly above / below each other, and only a couple of feet apart. The propeller striking the wing has occurred less than one second ago. *
Both aircraft landed safely, and no one was injured. This in-air collision marked the end of the 2019 races for both aircraft.