Rudder construction

 Rudder

 

1820mm x 405mm x 40mm laminated Douglas fir, recovered from granary

- clean up 4000mm x 220mm, cut to 1840mm

- set up table saw and rip boards to 40mm x 40mm +\~ @ 1840

Will see how they look after thickness planner and rough out, some spilt near the original ends. I should be able to move them to off cut area up near the tiller.

time - 4hrs 

 

 

Cross Section of Rudder 

Fiberglass strength strip + trailing edge and bottom removed for addition of solid glass edges to more easily wrap glass on sharp corners and provide abrasion resistance/sealing. 

 

Prep for glassing 

Glass over whole rudder

Vacuum Bag rudder. (Did not work well again)

Test Fit for rudder and skeg

Would like to reduce this gap, will be filling the semi-circle. 

Glass reinforced bottom and trailing edge.

Mistake #xx.  Used airfoil tools to make the NACA0010 420mm Cord, which gives you the 40mm width.

I was going to do the router jig as talked about on duckworks and @FreeRangeLiving

https://youtu.be/gH_TMsfv9vc?si=5lPwrezKeqXXsEB5 who did a great video on the process.

http://airfoiltools.com/plotter/index

My issue was when i printed it the printer took matters into its own hands to fit in all on the same sheet of paper, which change the scaling, i went around and on this for hours, possible days.  The width was correct but not the length.  I was working on a project for work printing something and did the same thing, then the penny dropped.  I printed just the foil shape and used that.  I will build a router jig for the next rudder i build but as i have been shaping and working on this one for years now it was pretty close and its going to be the shape it is for this round. 

Filling stress relief point. I'm not sure on the point of this after i glass the whole thing.

I was close to the NACA0010 shape, I sanded down areas that were high, then used the airfoil guide to trowel thickened epoxy to build out the shape, not the most efficient or light weight method but is where I'm at today.   24/11/204