Thank you for your suggestion and it may help,but we are not using cable. We are using 4 mm synthetic line similar to Dyneema. I am familiar with Nordhavn using chain to reduce the hum but was unable to get the 3/16 chain I wanted in Australia and it would cause more resistance. Thanks again, Ben > > To Idlewild please >> >> If you desire you can replace the cable that supports the paravanes with a >> chain and you will completely eliminate and hum or whistle. >> >> John Harris > > World Odd@ Sea (Nordhavn 46 with paravanes)