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Old 07-26-2019, 08:03 AM   #169
Mako
Guru
 
City: Seattle
Join Date: Jun 2012
Posts: 3,312
Even just eye-balling it, it appears that you're going to have very poor performance from that rudder, especially considering that you'll likely be focused on slow speed cruising.

Is that just one of the previous rudders from when your boat was a twin? Perhaps think about doubling the size of that rudder, making sure it is airfoil shaped, add a fish-tail wedge to the trailing edge, and possibly running a steel support skeg from the keel to support the bottom of the rudder post (like a deep, stainless C-channel).

Easier to do it now rather than later when you have to haul the boat back on land again with all those costs.

However, you may wish to visit boatdesign.net/forums and ask for some assistance with calculations for rudder size and also some feedback on how far back it is located.
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