As I stated anyone who thinks a rigid wing will weathercock nicely above a rolling, pitching and yawing boat is delusional.
The wing can never align when the boat is rolling so it will generate oscillating lift that pumps the rolling motion.
Even if the wing can rotate freely it has inertia so there is a delay from a force acting on it till it aligns. At some windspeed it will flutter wildly back and forth. Similar to a sail flapping violently but with a wing it will be in perfect harmony generating massive oscillating forces.
Life on a boat would be easy if the surface was always level but that is rarely the case. The surface can have slopes of 1 in 7 or even more in shallow water. A multihull follows the surface so it is hardly a stable platform to mount a wing above.
On 07/01/2016, at 6:30 AM, "taladorwood@yahoo.com.au [harryproa]" <harryproa@yahoogroups.com.au> wrote:
On the other hand, a freely weathervaning system with a vertical stabilizer will generate almost no drag and no lift in any kind of condition. However if the system is not free to rotate (frozen or sticky bearings) then yes you have a nightmare situation.
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Posted by: Rick Willoughby <rickwill@bigpond.net.au>
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