The planes have a 20 foot red or blue ribbon behind them, with the last foot yellow ribbon. If you are flying in the heat and someone cuts your ribbon, but there is still some yellow left you can continue to fly. If your ribbon is cut beyond the yellow, you have to land.
I was having sooo much fun with 9 pilots flying that everytime my ribbon got cut, no matter if only 1 inch was left, I would yell out
"I still see yellow!"
Very addicting! It was neat to do something were everyone was involved. If a person at DEAF was not flying in the heat they were watching. I do believe it is the fastest growing sport in RC. I got a call from Viagra to be my sponsor! J/k