Journal: Journal of the Royal Society Interface
Article Title: Repeated evolution of drag reduction at the air–water interface in diving kingfishers
doi: 10.1098/rsif.2019.0125
Figure Lengend Snippet: (a) Diagram of the diving tank set-up. Dive tank was 60 cm tall with an opening of 25 cm. The dive body consists of a 50 ml Falcon tube containing the accelerometer and additional weights as needed. The accelerometer was mounted with the negative x-axis aligned with gravity, and the positive z-axis oriented perpendicular to the bird dorsally. The Falcon tube was fitted with plastic drinking straws on either side, and the straws were threaded along the fishing line to maintain the dive orientation perpendicular to the water surface. (b) Exemplar accelerometer data from three representative species: Ceryle rudis (Pied kingfisher), Dacelo novaeguineae (laughing kookaburra) and Ceyx erithaca (black backed kingfisher). Data are smoothed by taking a running average for 3 points and are truncated before cavitation.
Article Snippet: The tube contained an Axivity AX-3 triaxial accelerometer (Axivity Ltd, Newcastle, UK) sampling at 1600 Hz with a maximum value of ±16 G. The accelerometer was oriented to the beak model with the negative x -axis aligned with gravity, and the positive z -axis oriented dorsally.
Techniques: