We were talking about the Double Key at the field the other day and I was trying to convince anther guy that he was stretching the lines too much before and after the half rolls on the 45 degree lines. He was doing a 3 count before and after the half rolls. After I got home I decided to make a scale drawing. I assumed all loop radii were 200 feet and the 45degree lines were tangent to the looping segments. The drawing scale is 100 feet per inch so you can see the top portion of the maneuver is 600 ft tall. The 45 degree lines are about 283 feet long and if you assume your plane is flying 100 feet per second you have about 3 seconds to fly - line, half roll, line - before starting the next loop segment. What do you think? Is everyone doing it this way?
