Calif Bill wrote:
"Wayne.B" wrote in message
...
On Tue, 24 Mar 2009 17:02:21 -0800, "Calif Bill"
wrote:

Wonder if you could consider the wings that the America's Cup boats have
on
the keel as an Active Variable Deadrise device?
Don't think so. The wings on AC boats were a rule beating device
which allowed the designer to increase the righting moment/stability
without exceeding the draft limit imposed by the 12 meter rule.

A lot of cruising boat builders thought if would be trendy if they
offered a wing keel also but then people found out what happens when
you run aground in a boat that increases its draft as you incline it.


I know what they do. But was wondering if they could be made movable and be
equivalent to changing the deadrise.



Winged keels with movable wings and winglets appeared in a later
generation of America's Cup yachts.

How about a hydrofoil boat...with variable and adjustable "deadrise" on
the foils?