Hello, This is the first time I've used a forum and hope someone out there can help. We have a new Beneteau Swift Trawler 34, Oct. 2014. Since delivery we've noticed that the steers wheel I. The upper helm vibrates when turning to port. The lower helm doesn't. We owned a ST42, which has 2 motors, and never had this problem. Some friends have suggested that it is the effect of the prop on the rudder. Anyone with the same problem? Any ideas? We don't feel that this is normal and can't find any reference to a similar problem on the net. Thank you in advance for your help.