- even speed flying the circles
- the relative size of the circles
- meeting at the top at the same time
Call IN when Kite 1 is flying horizontally at ^15, Kite 2 at ^35, both at about 60% from centre window. When they reach centre window they both start flying a circle (Kite 1 diameter 65% and Kite 2, 35%). They meet again at the top, about 10% apart; bottom flyer at ^70. Call OUT when both kites are flying horizontally, about 60% from centre window.