If the flipper had a smooth leading edge, the whale would be unable to make such tight rising turns because the water would churn and eddy behind the flipper and cease to create lift.
Jika tepi depan siripnya licin, paus tidak bisa berenang naik membentuk lingkaran sekecil itu karena air akan bergolak dan berputar di belakang sirip sehingga tidak lagi menghasilkan daya angkat.