Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Hull (watercraft):

This text has been unreferenced on Wikipedia for a very long time. If you can't find a source, be bold and remove it!

"

Smooth curve hulls are hulls that use, just like the curved hulls, a centreboard, or an attached keel.[citation needed]