Drag coefficient for six winged seeds

Sample calculation in Loggger Pro of Cd without errors.

("Mass"*9.8/1000)/((1.26*3.14*"Radius"^2*0.0001*"Terminal velocity"^2)/2)

Sample calculation of a possible extreme value of Cd.

("Mass"*9.8/1000)/((1.26*3.14*("Radius"+0.1)^2*0.0001*("Terminal velocity"+0.1)^2)/2)

By inspection, the drag coefficient is 0.50 with an average calculated error in each value of ± 0.05. The range of values is 0.05. Cd could be given as 5.0±0.03 where the error is half the range.