SailNet Community - View Single Post - current theory
Thread: current theory
View Single Post
post #8 of Old 05-20-2011
Once known as Hartley18
Classic30's Avatar
Join Date: Aug 2007
Location: Melbourne, Australia
Posts: 5,179
Thanks: 52
Thanked 85 Times in 85 Posts
Rep Power: 11
Originally Posted by smackdaddy View Post
That said, I could also see what you're saying about the bow wanting to fall a kayak in a river (which I actually have experienced).

So are there different dynamics at work here?
Yes there is.. the weight distribution in your average yacht is centered above the keel - and you have a deep keel and rudder adding their own lifting forces to keep the boat in line.

The weight distribution in a kayak is all down the stern - and you have a long, thin, keel with no appreciable lifting forces.

A yacht's rudder turns the boat around the axis of the keel, so, to get the "thought experiment" right, the proverbial finger should be placed in the center of the boat - not the transom. ...but if you hold the rudder dead center in a current with the boat stationary, you'll find it will eventually fall off one way or another as soon as the keel's "lift force" (generated by the angle of attack to the average current flow direction) counteracts the rudder's smaller "lift force".

..all highly technical really.

A bad day on a boat beats a good day in the office

Last edited by Classic30; 05-20-2011 at 12:15 AM.
Classic30 is offline  
Quote Share with Facebook
For the best viewing experience please update your browser to Google Chrome