Tip vortex and ventilation inception on a surface-piercing hydrofoil

This video was recorded during measurements of a surface-piercing A-Class catamaran dagger board hydrofoil in the K27 cavitation tunnel of TU-Berlin. In the first part it shows the tip vortex which is ventilated and touching the foil surface but not triggering the ventilation of the foil itself. The second part shows the ventilation inception on the foil surface – starting from the free surface and traveling towards the tip in a self-stabilizing process. To be seen is also the flexibility of the foil and testrig as one can see the foil tip flexing back when the ventilation starts. The measurements were part of the work presented in “NUMERICAL SIMULATIONS OF A SURFACE PIERCING A-CLASS CATAMARAN HYDROFOIL AND COMPARISON AGAINST MODEL TESTS” at the Chesapeake Sailing Yacht Symposium 2016. Download the document as PDF at http://www.sailyachtresearch.org/imag... This video was recorded at the K27 cavitation tunnel of and in cooperation with the Technical University of Berlin, September, 2015. LET'S CONNECT LinkedIn:   / dnv-maritime   Facebook:   / dnv.maritime   Twitter:   / dnv_maritime