Cavitation
Semi Spade Rudder
◈ Problem
Gaps between semi-spade rudder and horn cause gap
cavitations, vibrations, damages, energy loss.
Different streaming angles cause sheet cavitaion.
Sharp edge cause sole cavitation.
◈ Solution
- Full Spade Rudder
- Twisted Leading Edge
- Remove all of sharp edge
- Costa Bulb
- Anti-Cavitation Coating
Why Costa Bulb?
![Why Costa Bulb? Vortex = Cavitation, Energy Loss](/images/eng/sub52_img102_en.png)