...and don't forget, because of the different types of aircraft with different powers/speeds, the race has to be a handicap race, with a staggered start.
Before the aircraft participate in the actual race, each aircraft has to be timed over the full course.
Then, in the actual race, the aircraft take off at timed intervals, which results in all the aircraft reaching the finish line together, (almost...

That way, it is a fair race...!
Paul...Observer at my local airfield during their annual Air Races...
