Pictures and dimensions of an original hardwood rudder - could be helpful if you are ever unfortunate enough to have to reconstruct one!
Also see Rudder Reviewed
Twin plates - from ‘Mischief’ owned by David Smith
Showing underwater profile of twin-plate Sk17
(unknown boat)
Twin plates in fully-lowered position (unknown boat)
Technical drawing showing plate articulation.
Note draft is actually much less than stated in publications.
