A lot of boats sing at certain wind speeds I believe it is caused by a phenomena known as "von Karman vortex shedding"You will find it described in many fluid dynamics treatises. Don WagnerC&C 41 CBDer Baron
G Donald Wagner [email protected]
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
