So today on haul out to pressure wash, replace zincs and put a pair of tuned props on I notice these raised projections on the aft section near the rudders on the hull. Unbeliveable engineering by ChisCraft designers. At speed this helps the hull lft and reduce wetted surface at speed without the trim tabs. Really remarkable engineering for the day. Blow up the photo to see!!
L
That’s where the bottom paint is the thinnest when I touch it up. You are right, brilliant
Sometimes called wedges. A way of adding rocker to the hull bottom. Also aids in keeping the bow down. Very cool. Thanks John
My 1969 Commander does not have them. Are they from the factory? An option? Wondering why they got taken off on later model.
Mark
Great question. I am sure they made changes year to year and model to model. I am not sure which model is shown or which you have. If the model required more stern lift due to equipment or cabin placement on the hull, they could add them or delete. Just a guess.
My boat is a 1968 31 Commander Salon , hull #1 out of the Chattanoga Plant. I don’t know how many were made in Michigan if any prior to mine. A few oddities. Forward engine room bulkhead moved forward in later years and my shaft logs are larger than required for the 1-1/4” shafts.
I am guessing it has to do with the size of boat mine being a 38 I have never seen them on a 38.
Photos of Trim Tabs on 1972 41 Commander.
Closed all the way.